/* nurb:EndSurface() -> nurb */
static int luaglu_end_surface(lua_State *L)
{
LuaGLUnurb *lnurb=luaglu_checknurb(L,1);
gluEndSurface(lnurb->nurb);
lua_pushvalue(L,1);
return 1;
}
void drawGrass()
{
int i, j, k;
int num = 0;
glPushMatrix();
glTranslatef(0.0, -5.0, 0.0);
glColor3f(0.0, grasscolor, 0.0);
for (i = -GRASSAREA; i<GRASSAREA; ++i){
for (j = -GRASSAREA; j<GRASSAREA; ++j){
glPushMatrix();
glTranslatef((0.5 + i + ((randx[num] % (100 + 1)) / 100.0 - 0.5)) / 4.0, 0.0, (0.5 + j + ((randz[num] % (100 + 1)) / 100.0 - 0.5)) / 4.0);
glRotatef(90 * (randrotation[num] % 101) / 100, 0.0, 1.0, 0.0);
for (k = 0; k<4; ++k) {
cpoint[3][k][2] = 0.2*sin(2 * PI*(randrotation[num] % 100 + 1) / 100 + thetagrass*PI / 180.0)*(1 - wind) + (0.5*sin(90 * (randrotation[num] % 101) / 100 * PI / 180.0))*wind;
cpoint[3][k][0] = 0.5*cos(90 * (randrotation[num] % 101) / 100 * PI / 180.0)*wind;
cpoint[3][k][1] = 0.5 + 0.05*sin(2 * PI*(randrotation[num] % 100 + 1) / 100 + thetawind*PI / 180.0)*wind;
}
gluBeginSurface(nrb_obj);
gluNurbsSurface(nrb_obj,
8, knotvec_u,
8, knotvec_v,
3,
3 * 4,
&cpoint[0][0][0],
4, 4,
GL_MAP2_VERTEX_3
);
gluEndSurface(nrb_obj);
glPopMatrix();
++num;
}
}
glPopMatrix();
}
void display(void)
{
GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
int i, j;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(330.0, 1.,0.,0.);
glScalef (0.5, 0.5, 0.5);
gluBeginSurface(theNurb);
gluNurbsSurface(theNurb,
8, knots, 8, knots,
4 * 3, 3, &ctlpoints[0][0][0],
4, 4, GL_MAP2_VERTEX_3);
gluEndSurface(theNurb);
if (showPoints) {
glPointSize(5.0);
glDisable(GL_LIGHTING);
glColor3f(1.0, 1.0, 0.0);
glBegin(GL_POINTS);
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
glVertex3f(ctlpoints[i][j][0],
ctlpoints[i][j][1], ctlpoints[i][j][2]);
}
}
glEnd();
glEnable(GL_LIGHTING);
}
glPopMatrix();
glFlush();
}
void display(void)
{
GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
GLfloat edgePt[5][2] = /* counter clockwise */
{{0.0, 0.0}, {1.0, 0.0}, {1.0, 1.0}, {0.0, 1.0}, {0.0, 0.0}};
GLfloat curvePt[4][2] = /* clockwise */
{{0.25, 0.5}, {0.25, 0.75}, {0.75, 0.75}, {0.75, 0.5}};
GLfloat curveKnots[8] =
{0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
GLfloat pwlPt[4][2] = /* clockwise */
{{0.75, 0.5}, {0.5, 0.25}, {0.25, 0.5}};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(330.0, 1.,0.,0.);
glScalef (0.5, 0.5, 0.5);
gluBeginSurface(theNurb);
gluNurbsSurface(theNurb, 8, knots, 8, knots,
4 * 3, 3, &ctlpoints[0][0][0],
4, 4, GL_MAP2_VERTEX_3);
gluBeginTrim (theNurb);
gluPwlCurve (theNurb, 5, &edgePt[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim (theNurb);
gluBeginTrim (theNurb);
gluNurbsCurve (theNurb, 8, curveKnots, 2,
&curvePt[0][0], 4, GLU_MAP1_TRIM_2);
gluPwlCurve (theNurb, 3, &pwlPt[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim (theNurb);
gluEndSurface(theNurb);
glPopMatrix();
glFlush();
}
//-*****************************************************************************
void INuPatchDrw::draw( const DrawContext &iCtx )
{
const V3f * points = m_positions -> get();
const float *u_knot = m_uKnot -> get();
const float *v_knot = m_vKnot -> get();
size_t nknotu = m_uKnot -> size();
size_t nknotv = m_vKnot -> size();
glColor3f(1.0, 1.0, 1.0);
gluBeginSurface(nurb);
gluNurbsSurface( nurb,
nknotu, (GLfloat *) &u_knot[0],
nknotv, (GLfloat *) &v_knot[0],
3, m_nu*3, // stride
(GLfloat *)&points[0][0],
m_uOrder, m_vOrder, //orders
GL_MAP2_VERTEX_3
);
gluEndSurface(nurb);
IObjectDrw::draw( iCtx );
}
static void Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glTranslatef(4.0, 4.5, 2.5);
glRotatef(rotY, 1, 0, 0);
glRotatef(rotX, 0, 1, 0);
glTranslatef(-4.0, -4.5, -2.5);
gluBeginSurface(theNurbs);
gluNurbsSurface(theNurbs, S_NUMKNOTS, sknots, T_NUMKNOTS, tknots,
4*T_NUMPOINTS, 4, &ctlpoints[0][0][0], S_ORDER,
T_ORDER, GL_MAP2_VERTEX_4);
gluEndSurface(theNurbs);
glPopMatrix();
glFlush();
if (doubleBuffer) {
glutSwapBuffers();
}
}
void myDisplayObject( const ON_Object& geometry, const ON_Material& material, GLUnurbsObj* nobj )
{
// Called from myDisplay() to show geometry.
// Uses ON_GL() functions found in rhinoio_gl.cpp.
const ON_Point* point=0;
const ON_PointCloud* cloud=0;
const ON_Brep* brep=0;
const ON_Mesh* mesh=0;
const ON_Curve* curve=0;
const ON_Surface* surface=0;
// specify rendering material
ON_GL( material );
brep = ON_Brep::Cast(&geometry);
if ( brep )
{
ON_GL(*brep, nobj);
return;
}
mesh = ON_Mesh::Cast(&geometry);
if ( mesh )
{
ON_GL(*mesh);
return;
}
curve = ON_Curve::Cast(&geometry);
if ( curve )
{
ON_GL( *curve, nobj );
return;
}
surface = ON_Surface::Cast(&geometry);
if ( surface )
{
gluBeginSurface( nobj );
ON_GL( *surface, nobj );
gluEndSurface( nobj );
return;
}
point = ON_Point::Cast(&geometry);
if ( point )
{
ON_GL(*point);
return;
}
cloud = ON_PointCloud::Cast(&geometry);
if ( cloud )
{
ON_GL(*cloud);
return;
}
}
void display(void)
{
GLfloat knots1[12] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0
, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 };
GLfloat knots2[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
int i, j;
GLfloat edgePt[5][2] =
{{0.0, 0.0}, {1.0, 0.0}, {1.0, 1.0}, {0.0, 1.0},
{0.0, 0.0}};
GLfloat pwlPt[42][2];
for(unsigned int k = 0; k < 42; ++k)
{
pwlPt[k][0] = 0.5 + 0.3 * cos(2.0*PI*k/41.0);
pwlPt[k][1] = 0.5 + 0.3 * sin(-2.0*PI*k/41.0);
}
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(330.0, 1.,0.,0.);
glScalef (0.3, 0.3, 0.3);
gluBeginSurface(theNurb);
gluNurbsSurface(theNurb,
12, knots1, 8, knots2,
4 * 3, 3, &ctlpoints[0][0][0],
6, 4, GL_MAP2_VERTEX_3);
// trim
gluBeginTrim (theNurb);
gluPwlCurve(theNurb, 5, &edgePt[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim (theNurb);
gluBeginTrim (theNurb);
gluPwlCurve (theNurb, 42, &pwlPt[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim (theNurb);
gluEndSurface(theNurb);
if (showPoints) {
glPointSize(5.0);
glDisable(GL_LIGHTING);
glColor3f(1.0, 1.0, 0.0);
glBegin(GL_POINTS);
for (i = 0; i < 8; i++) {
for (j = 0; j < 4; j++) {
glVertex3f(ctlpoints[i][j][0],
ctlpoints[i][j][1], ctlpoints[i][j][2]);
}
}
glEnd();
glEnable(GL_LIGHTING);
}
glPopMatrix();
glFlush();
}
void GraphicsPainter::drawNurbsSurface(const QVector<Point3f> &controlPoints, const QVector<float> &uKnots, const QVector<float> &vKnots, int uOrder, int vOrder)
{
// nurbs control points
QVector<float> points(controlPoints.size() * 3);
for(int i = 0; i < controlPoints.size(); i++){
points[i*3+0] = controlPoints[i].x();
points[i*3+1] = controlPoints[i].y();
points[i*3+2] = controlPoints[i].z();
}
// nurbs knot vectors
QVector<float> uKnotVector(uKnots.size());
for(int i = 0; i < uKnots.size(); i++)
uKnotVector[i] = uKnots[i];
QVector<float> vKnotVector(vKnots.size());
for(int i = 0; i < vKnots.size(); i++)
vKnotVector[i] = vKnots[i];
int uStride = 3 * (vKnotVector.size() - vOrder);
int vStride = 3;
glEnable(GL_AUTO_NORMAL);
GLUnurbsObj *nurb = gluNewNurbsRenderer();
gluNurbsProperty(nurb, GLU_CULLING, GL_TRUE); // only render visible parts of the surface
gluNurbsProperty(nurb, GLU_V_STEP, 4);
gluNurbsProperty(nurb, GLU_U_STEP, 10);
gluNurbsProperty(nurb, GLU_SAMPLING_METHOD, GLU_DOMAIN_DISTANCE);
#ifdef Q_OS_WIN
gluNurbsCallback(nurb, GLU_ERROR, (void (__stdcall *)()) nurbsErrorCallback);
#else
gluNurbsCallback(nurb, GLU_ERROR, (void (*)()) nurbsErrorCallback);
#endif
gluBeginSurface(nurb);
gluNurbsSurface(nurb,
uKnotVector.size(),
uKnotVector.data(),
vKnotVector.size(),
vKnotVector.data(),
uStride,
vStride,
points.data(),
uOrder,
vOrder,
GL_MAP2_VERTEX_3);
gluEndSurface(nurb);
gluDeleteNurbsRenderer(nurb);
glDisable(GL_AUTO_NORMAL);
}
// Called to draw scene
void RenderScene(void)
{
// Draw in Blue
glColor3ub(0,0,220);
// Clear the window with current clearing color
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Save the modelview matrix stack
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
// Rotate the mesh around to make it easier to see
glRotatef(330.0f, 1.0f,0.0f,0.0f);
// Render the NURB
// Begin the NURB definition
gluBeginSurface(pNurb);
// Evaluate the surface
gluNurbsSurface(pNurb, // pointer to NURBS renderer
8, Knots, // No. of knots and knot array u direction
8, Knots, // No. of knots and knot array v direction
4 * 3, // Distance between control points in u dir.
3, // Distance between control points in v dir.
&ctrlPoints[0][0][0], // Control points
4, 4, // u and v order of surface
GL_MAP2_VERTEX_3); // Type of surface
// Outer area, include entire curve
gluBeginTrim (pNurb);
gluPwlCurve (pNurb, 5, &outsidePts[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim (pNurb);
// Inner triangluar area
gluBeginTrim (pNurb);
gluPwlCurve (pNurb, 4, &insidePts[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim (pNurb);
// Done with surface
gluEndSurface(pNurb);
// Restore the modelview matrix
glPopMatrix();
// Dispalay the image
glutSwapBuffers();
}
/* drawing ghost with NURBS spline */
void DrawGhost(void)
{
// control points for bezier curve
GLfloat ctlpoints[4][4][3] = {
{ {-3., -5., 0.}, {-5., -2., -5.}, {-5., 2., -5.}, {-3., 3., 0.} },
{ {-2., -3., 0.}, {-2., -2., 5.}, {-2., 2., 5.}, {-2., 5., 0.} },
{ {2., -3., 0.}, {2., -2., -5.}, {2., 2., -5.}, {2., 5., 0.} },
{ {3., -5., 0.}, {5., -2., 5.}, {5., 2., 5.}, {3., 3., 0.} }
};
GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
gluBeginSurface(theGhostNurb);
gluNurbsSurface(theGhostNurb,
8, knots, 8, knots,
4 * 3, 3, &ctlpoints[0][0][0],
4, 4, GL_MAP2_VERTEX_3);
// map the vertices
gluNurbsSurface(theGhostNurb,
8, knots, 8, knots,
4 * 3, 3, &ctlpoints[0][0][0],
4, 4, GL_MAP2_NORMAL);
// map the normals
gluEndSurface(theGhostNurb);
// draw eyes with two white spheres
glPushMatrix();
glColor3f(1.0f, 1.0f, 1.0f);
glTranslatef(1.5, 1.5, 0.);
glutSolidSphere(0.5, 5, 5);
glTranslatef(-3., 0., 0.);
glutSolidSphere(0.5, 5, 5);
glPopMatrix();
/* for testing the points of bezier curve
glPointSize(5.0);
glColor3f(1.0, 0.0, 0.0);
glBegin(GL_POINTS);
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
glVertex3f(ctlpoints[i][j][0],
ctlpoints[i][j][1], ctlpoints[i][j][2]);
printf("point: %lf %lf %lf", ctlpoints[i][j][0],
ctlpoints[i][j][1], ctlpoints[i][j][2]);
}
}
glEnd();
*/
}
void Sample_12_8::draw()
{
int i, j;
GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
GLfloat edgePt[5][2] = /* counter clockwise */
{{0.0, 0.0}, {1.0, 0.0}, {1.0, 1.0}, {0.0, 1.0}, {0.0, 0.0}};
GLfloat curvePt[4][2] = /* clockwise */
{{0.25, 0.5}, {0.25, 0.75}, {0.75, 0.75}, {0.75, 0.5}};
GLfloat curveKnots[8] =
{0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
GLfloat pwlPt[4][2] = /* clockwise */
{{0.75, 0.5}, {0.5, 0.25}, {0.25, 0.5}};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(330.0, 1.,0.,0.);
glScalef (0.5, 0.5, 0.5);
gluBeginSurface(m_theNurb);
gluNurbsSurface(m_theNurb, 8, knots, 8, knots,
4 * 3, 3, &m_ctlpoints[0][0][0],
4, 4, GL_MAP2_VERTEX_3);
gluBeginTrim (m_theNurb);
gluPwlCurve (m_theNurb, 5, &edgePt[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim (m_theNurb);
gluBeginTrim (m_theNurb);
gluNurbsCurve (m_theNurb, 8, curveKnots, 2,
&curvePt[0][0], 4, GLU_MAP1_TRIM_2);
gluPwlCurve (m_theNurb, 3, &pwlPt[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim (m_theNurb);
gluEndSurface(m_theNurb);
if (m_showPoints) {
glPointSize(5.0);
glDisable(GL_LIGHTING);
glColor3f(1.0, 1.0, 0.0);
glBegin(GL_POINTS);
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
glVertex3f(m_ctlpoints[i][j][0],
m_ctlpoints[i][j][1], m_ctlpoints[i][j][2]);
}
}
glEnd();
glEnable(GL_LIGHTING);
}
glPopMatrix();
}
void RenderScene(void)
{
glColor3ub(0,0,220);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glRotatef(330.0f, 1.0f, 0.0f, 0.0f);
//修剪框是一个闭合的环
//外修剪框
GLfloat outSidePts[5][2] =
{{0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f}, {0.0f, 1.0f}, {0.0f, 0.0f}};
//内修剪框
GLfloat inSidePts[4][2] =
{{0.25f, 0.25f}, { 0.5f, 0.5f}, {0.75f, 0.25f},{0.25f, 0.25f} };
gluBeginSurface(pNurb);
//定义NURBS表面
gluNurbsSurface(pNurb,
8, Knots, //u定义域内的结点个数，以及结点序列
8, Knots,//v定义域内的结点个数，以及结点序列
4 * 3, //u方向上的控制点间隔
3, //v方向上的控制点间隔
&ctrlPoints[0][0][0], //控制点数组
4, 4, //u v的次数
GL_MAP2_VERTEX_3);//产生的类型
//开始修剪
gluBeginTrim(pNurb);
gluPwlCurve(pNurb,
5, //修剪点的个数
&outSidePts[0][0], //修剪点数组
2, //点之间的间隔
GLU_MAP1_TRIM_2);//修剪的类型
gluEndTrim(pNurb);
gluBeginTrim(pNurb);
gluPwlCurve(pNurb, 4, &inSidePts[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim(pNurb);
gluEndSurface(pNurb);
DrawPoints();
glPopMatrix();
glutSwapBuffers();
}
void draw_solid(const k3d::gl::render_state& State, const k3d::double_t Height, const k3d::double_t Radius, const k3d::double_t SweepAngle)
{
if(!Radius)
return;
k3d::mesh::knots_t knots;
k3d::mesh::weights_t weights;
k3d::mesh::points_t arc_points;
k3d::nurbs_curve::circular_arc(k3d::vector3(1, 0, 0), k3d::vector3(0, 1, 0), 0, SweepAngle, 4, knots, weights, arc_points);
std::vector<GLfloat> gl_u_knot_vector(knots.begin(), knots.end());
std::vector<GLfloat> gl_v_knot_vector;
std::vector<GLfloat> gl_control_points;
gl_v_knot_vector.insert(gl_v_knot_vector.end(), 2, 0);
gl_v_knot_vector.insert(gl_v_knot_vector.end(), 1);
gl_v_knot_vector.insert(gl_v_knot_vector.end(), 2, 2);
const k3d::point3 offset = Height * k3d::point3(0, 0, 1);
for(k3d::uint_t i = 0; i <= 2; ++i)
{
const k3d::double_t radius2 = k3d::mix(Radius, 0.001 * Radius, static_cast<k3d::double_t>(i) / static_cast<k3d::double_t>(2));
for(k3d::uint_t j = 0; j != arc_points.size(); ++j)
{
gl_control_points.push_back(weights[j] * (radius2 * arc_points[j][0] + offset[0]));
gl_control_points.push_back(weights[j] * (radius2 * arc_points[j][1] + offset[1]));
gl_control_points.push_back(weights[j] * (radius2 * arc_points[j][2] + offset[2]));
gl_control_points.push_back(weights[j]);
}
}
GLUnurbsObj* const nurbs_renderer = gluNewNurbsRenderer();
// Important! We load our own matrices for efficiency (saves round-trips to the server) and to prevent problems with selection
gluNurbsProperty(nurbs_renderer, GLU_AUTO_LOAD_MATRIX, GL_FALSE);
gluNurbsProperty(nurbs_renderer, GLU_CULLING, GL_TRUE);
GLfloat gl_modelview_matrix[16];
glGetFloatv(GL_MODELVIEW_MATRIX, gl_modelview_matrix);
gluLoadSamplingMatrices(nurbs_renderer, gl_modelview_matrix, State.gl_projection_matrix, State.gl_viewport);
gluBeginSurface(nurbs_renderer);
gluNurbsSurface(nurbs_renderer, gl_u_knot_vector.size(), &gl_u_knot_vector[0], gl_v_knot_vector.size(), &gl_v_knot_vector[0], 4, 36, &gl_control_points[0], 3, 2, GL_MAP2_VERTEX_4);
gluEndSurface(nurbs_renderer);
gluDeleteNurbsRenderer(nurbs_renderer);
}
static void Init(void)
{
theNurbs = gluNewNurbsRenderer();
gluNurbsCallback(theNurbs, GLU_ERROR, ErrorCallback);
gluNurbsProperty(theNurbs, GLU_SAMPLING_TOLERANCE, 15.0);
gluNurbsProperty(theNurbs, GLU_DISPLAY_MODE, GLU_OUTLINE_PATCH);
expectedError = GLU_INVALID_ENUM;
gluNurbsProperty(theNurbs, ~0, 15.0);
expectedError = GLU_NURBS_ERROR13;
gluEndSurface(theNurbs);
expectedError = 0;
glColor3f(1.0, 1.0, 1.0);
}
void nurbsInit(void)
{
theNurbs = gluNewNurbsRenderer();
gluNurbsCallback(theNurbs, GLU_ERROR, ErrorCallback);
gluNurbsProperty(theNurbs,GLU_NURBS_MODE,GLU_NURBS_TESSELLATOR);
gluNurbsCallback(theNurbs,GLU_NURBS_BEGIN,beginCallback);
gluNurbsCallback(theNurbs,GLU_NURBS_END,endCallback);
gluNurbsCallback(theNurbs,GLU_NURBS_VERTEX,vertexCallback);
gluNurbsProperty(theNurbs, GLU_SAMPLING_TOLERANCE, 15.0);
gluNurbsProperty(theNurbs, GLU_DISPLAY_MODE, GLU_OUTLINE_PATCH);
expectedError = GLU_INVALID_ENUM;
gluNurbsProperty(theNurbs, ~0, 15.0);
expectedError = GLU_NURBS_ERROR13;
gluEndSurface(theNurbs);
expectedError = 0;
}
void draw_local()
{
int i,j;
GLfloat knots[8] = {0,1,2,3,4,5,6,7};
GLfloat mat_diffuse[] = { 0.7, 0.7, 0.7, 1.0 };
GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat mat_shininess[] = { 100.0 };
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
theNurb = gluNewNurbsRenderer();
gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0);
gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
gluNurbsCallback(theNurb, GLU_ERROR, (GLvoid (*)()) nurbsError);
gluBeginSurface(theNurb);
gluNurbsSurface(theNurb,
8, knots, 8, knots,
3*6, 3, &ctlpoints[0][0][0],
2, 2, GL_MAP2_VERTEX_3);
gluEndSurface(theNurb);
if (showPoints) {
glPointSize(5.0);
glDisable(GL_LIGHTING);
glColor3f(1.0, 1.0, 0.0);
glBegin(GL_POINTS);
for (i=0; i<6; i++) {
for (j=0; j<6; j++) {
glVertex3f(ctlpoints[i][j][0],
ctlpoints[i][j][1],
ctlpoints[i][j][2]);
}
}
glEnd();
glEnable(GL_LIGHTING);
}
gluDeleteNurbsRenderer(theNurb);
}
void render_scene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* Render trimmed surface */
gluBeginSurface(nurb);
gluNurbsSurface(nurb, 8, knots, 8, knots, 4*3, 3, &ctlpoints[0][0][0], 4, 4, GLU_MAP2_VERTEX_3);
gluBeginTrim(nurb);
gluPwlCurve(nurb, 5, &edgePt[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim(nurb);
gluBeginTrim(nurb);
gluNurbsCurve(nurb, 8, curveKnots, 2, &curvePt[0][0], 4, GLU_MAP1_TRIM_2);
gluPwlCurve (nurb, 3, &pwlPt[0][0], 2, GLU_MAP1_TRIM_2);
gluEndTrim(nurb);
gluEndSurface(nurb);
/* Flush all drawings */
glFlush();
}
/* Draw the nurb, possibly with trimming */
void draw_nurb(GLboolean trimming) {
static GLfloat angle = 0.0;
int i,j;
/* wave the flag by rotating Z coords though a sine wave */
for (i=1; i<4; i++)
for (j=0; j<4; j++)
ctlpoints[i][j][2] = sin((GLfloat)i+angle);
angle += 0.1;
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(2.5,-1.0,0.0);
glScalef(1.5,1.0,1.0);
glRotatef(90,0.,0.,1.);
glRotatef(mousey/10.,1.,0.,0.);
glRotatef(mousex/10.,0.,1.,0.);
gluBeginSurface(nurbsflag);
gluNurbsSurface(nurbsflag,S_NUMKNOTS, sknots, T_NUMKNOTS, tknots,
3 * T_NUMPOINTS, 3,
&ctlpoints[0][0][0], T_ORDER, S_ORDER, GL_MAP2_VERTEX_3);
if (trimming) {
dotrim(whole);
dotrim(path[0]);
dotrim(path[1]);
dotrim(path[2]);
}
gluEndSurface(nurbsflag);
if (hull) draw_hull(ctlpoints);
glPopMatrix();
}
static int tolua_glu_gluEndSurface00(lua_State* tolua_S)
{
#ifndef TOLUA_RELEASE
tolua_Error tolua_err;
if (
!tolua_isusertype(tolua_S,1,"GLUnurbsObj",0,&tolua_err) ||
!tolua_isnoobj(tolua_S,2,&tolua_err)
)
goto tolua_lerror;
else
#endif
{
GLUnurbsObj* nobj = ((GLUnurbsObj*) tolua_tousertype(tolua_S,1,0));
{
gluEndSurface(nobj);
}
}
return 0;
#ifndef TOLUA_RELEASE
tolua_lerror:
tolua_error(tolua_S,"#ferror in function 'gluEndSurface'.",&tolua_err);
return 0;
#endif
}
/***************************************************
* 用NURBS工具渲染水波纹
**************************************************/
void drawWave(void)
{
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glMaterialfv(GL_FRONT, GL_DIFFUSE, wave_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, wave_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, wave_shininess);
gluBeginSurface(waveSur);
if (du % 2 == 0) {
gluNurbsSurface(waveSur,
ORDER * 4,
knots,
ORDER * 4,
knots,
ORDER * 2 * 3,
3,
&ctlPoints[0][0][0],
ORDER * 2,
ORDER * 2,
GL_MAP2_VERTEX_3);
} else {
gluNurbsSurface(waveSur,
ORDER * 4,
knots,
ORDER * 4,
knots,
ORDER * 2 * 3,
3,
&ctlPoints1[0][0][0],
ORDER * 2,
ORDER * 2,
GL_MAP2_VERTEX_3);
}
gluEndSurface(waveSur);
glPopMatrix();
}
/* drawing fruit with NURBS spline */
void DrawFruit(void)
{
// control points for bezier curve
GLfloat fruit_ctlpoints[4][4][3] = {
{ {-3., -2., 0.}, {-5., -1., -3.}, {-5., 2., -3.}, {-3., 5., -3.} },
{ {-1., -4., 0.}, {-2., -2., 3.}, {-2., 1., 3.}, {-1., 2., -3.} },
{ {1., -4., 0.}, {2., -3., 3.}, {2., -2., 3.}, {1., -1., -3.} },
{ {3., -2., 0.}, {5., 0., -3.}, {5., -1., -3.}, {3., 1., -3.} }
};
GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
gluBeginSurface(theFruitNurb);
// map the vertices
gluNurbsSurface(theFruitNurb,
8, knots, 8, knots,
4 * 3, 3, &fruit_ctlpoints[0][0][0],
4, 4, GL_MAP2_VERTEX_3);
// map the normals
gluNurbsSurface(theFruitNurb,
8, knots, 8, knots,
4 * 3, 3, &fruit_ctlpoints[0][0][0],
4, 4, GL_MAP2_NORMAL);
gluEndSurface(theFruitNurb);
}
static void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef (4., 4.5, 2.5);
glRotatef (220.0, 1., 0., 0.);
glRotatef (115.0, 0., 1., 0.);
glTranslatef (-4., -4.5, -2.5);
gluBeginSurface(theNurb);
gluNurbsSurface(theNurb,
S_NUMKNOTS, sknots,
T_NUMKNOTS, tknots,
4 * T_NUMPOINTS,
4,
&ctlpoints[0][0][0],
S_ORDER, T_ORDER,
GL_MAP2_VERTEX_4);
gluEndSurface(theNurb);
glPopMatrix();
glFlush();
}
void display (void) {
glClearColor (0.0,0.0,0.0,1.0); //clear the screen to black
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //clear the color buffer and the depth buffer
glMatrixMode( GL_MODELVIEW );
glColor4f(1.0f,0.0f,0.0f,1.0f);
glEnable(GL_SCISSOR_TEST);
glMatrixMode (GL_PROJECTION); //set the matrix to projection
// Draw the primary view
glViewport (0, 0, (GLsizei)screen_width, (GLsizei)screen_height); //set the viewport to the current window specifications
glScissor(0, 0, (GLsizei)screen_width, (GLsizei)screen_height);
glLoadIdentity ();
if (lighting) {
GLfloat AmbientLight[] = {0.1, 0.1, 0.2};
glLightfv (GL_LIGHT0, GL_AMBIENT, AmbientLight);
GLfloat DiffuseLight[] = {1, 1, 1};
glLightfv (GL_LIGHT1, GL_DIFFUSE, DiffuseLight);
GLfloat LightPosition[] = {xpos, ypos, zpos, 1};
glLightfv(GL_LIGHT1, GL_POSITION, LightPosition);
}
gluPerspective (60, (GLfloat)screen_width / (GLfloat)screen_height, 1.0, 100.0);
gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); //camera position, x,y,z, looking at x,y,z, Up Positions of the camera
camera();
glPushMatrix();
if (lighting) {
texture1 = LoadTexture( "texture.raw", 256, 256 );
texture2 = LoadTexture( "/dev/urandom", 256, 256 );
texture3 = LoadTexture( "water.raw", 500, 375 );
texture4 = LoadTexture( "bubbles.raw", 200, 200 );
glEnable( GL_TEXTURE_2D ); //enable 2D texturing
glEnable(GL_TEXTURE_GEN_S); //enable texture coordinate generation
glEnable(GL_TEXTURE_GEN_T);
if (fog) {
GLfloat fogColor[4]= {0.5f, 1.0f, 0.5f, 1}; // Fog Color
glFogi(GL_FOG_MODE, GL_EXP); // Fog Mode
glFogfv(GL_FOG_COLOR, fogColor); // Set Fog Color
glFogf(GL_FOG_DENSITY, 1.0f); // How Dense Will The Fog Be
glHint(GL_FOG_HINT, GL_DONT_CARE); // Fog Hint Value
glFogf(GL_FOG_START, n*space); // Fog Start Depth
glFogf(GL_FOG_END,-n*space); // Fog End Depth
}
if (nurb) {
glPushMatrix();
glRotatef(270,0.0,1.0,0.0);
glTranslated(n*space/2,n*space/2,-n*space);
GLfloat ctlpoints[4][4][3];
GLUnurbsObj *theNurb;
GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
int u, v;
for (u = 0; u < 4; u++) {
for (v = 0; v < 4; v++) {
ctlpoints[u][v][0] = 2.0*((GLfloat)u - 1.5);
ctlpoints[u][v][1] = 2.0*((GLfloat)v - 1.5);
if ( (u == 1 || u == 2) && (v == 1 || v == 2))
ctlpoints[u][v][2] = 3.0;
else
ctlpoints[u][v][2] = -3.0;
}
}
theNurb = gluNewNurbsRenderer();
gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0);
gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
gluBeginSurface(theNurb);
gluNurbsSurface(theNurb,
8, knots, 8, knots,
4 * 3, 3, &ctlpoints[0][0][0],
4, 4, GL_MAP2_VERTEX_3);
gluEndSurface(theNurb);
glPopMatrix();
}
}
cube(); //call the cube drawing function
glPopMatrix();
if (lighting) {
FreeTexture( texture1 );
FreeTexture( texture2 );
FreeTexture( texture3 );
FreeTexture( texture4 );
}
glPushMatrix();
glTranslated(space*((n/2)+1),space*(n/2),space*(n/2));
glutWireCube(space*n);
glPopMatrix();
// Draw the secondary view
glViewport (3*(screen_width/4), 3*(screen_height/4), screen_width/4, screen_width/4); //set the viewport to the current window specifications
glScissor(3*(screen_width/4), 3*(screen_height/4), screen_width/4, screen_width/4);
glLoadIdentity();
glOrtho(-1, 13, -1, 13, -1, 13);
glRotatef(90,0.0,1.0,0.0);
cube();
glDisable(GL_SCISSOR_TEST);
glutSwapBuffers(); //swap the buffers
}
void display(void) {
int i,j;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(eixox, 1 ,0 ,0);
glRotatef(eixoy, 0 ,1 ,0);
glRotatef(eixoz, 0 ,0 ,1);
glScalef(0.25, 0.25, 0.25);
glPushMatrix();
glGetDoublev (GL_MODELVIEW_MATRIX, matrizModelview);
glGetDoublev (GL_PROJECTION_MATRIX, matrizProjecao);
glGetIntegerv (GL_VIEWPORT, matrizViewport);
glPopMatrix();
glDisable(GL_LIGHTING);
glPushMatrix();
glTranslatef(-5,-5,-5);
glColor3f(1,1,1);
glBegin(GL_LINES);
glVertex3f(0,0,0);
glVertex3f(1,0,0);
glEnd();
glRasterPos3f(1.5,0,0);
glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_10, 'x');
glBegin(GL_LINES);
glVertex3f(0,0,0);
glVertex3f(0,1,0);
glEnd();
glRasterPos3f(0,1.5,0);
glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_10, 'y');
glBegin(GL_LINES);
glVertex3f(0,0,0);
glVertex3f(0,0,1);
glEnd();
glRasterPos3f(0,0,1.5);
glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_10, 'z');
glPopMatrix();
glEnable(GL_LIGHTING);
switch(spline) {
case BEZIER:
glEnable(GL_AUTO_NORMAL);
glMap2f(GL_MAP2_VERTEX_3, 0.0, 1.0, 3, 4, 0, 1, 3*nVertices, 4, &vertices[0][0][0]);
glMapGrid2f(20, 0, 1.0, 20, 0, 1.0);
glEvalMesh2(GL_FILL, 0, 20, 0, 20);
glEnd();
break;
case NURBS:
gluBeginSurface(nc);
gluNurbsSurface(nc, nNosx, nosx, nNosy, nosy, 4*3, 3, &vertices[0][0][0], ordemx, ordemy, GL_MAP2_VERTEX_3);
gluEndSurface(nc);
break;
}
glPointSize(5.0);
glColor3f(1.0, 0.0, 0.0);
glDisable(GL_LIGHTING);
glBegin(GL_POINTS);
for(i=0; i<4; i++) {
for(j=0; j<4; j++) {
if((vcx==i)&&(vcy==j)) {
glColor3f(1.0,1.0,0.0);
glVertex3fv(&vertices[i][j][0]);
glColor3f(1.0,0.0,0.0);
}
else {
glVertex3fv(&vertices[i][j][0]);
}
}
}
glEnable(GL_LIGHTING);
glEnd();
glColor3f(1.0, 1.0, 1.0);
glPopMatrix();
glFlush();
glutSwapBuffers();
}
void ON_GL( const ON_BrepFace& face,
GLUnurbsObj* nobj // created with gluNewNurbsRenderer )
)
{
bool bSkipTrims = false;
const ON_Mesh* mesh;
mesh = face.Mesh(ON::render_mesh);
if ( mesh )
{
// use saved render mesh
ON_GL(*mesh);
}
else
{
// use (slow and buggy) glu trimmed NURBS rendering
double knot_scale[2][2] = {{0.0,1.0},{0.0,1.0}};
const ON_Brep* brep = face.Brep();
if ( !brep )
return;
// untrimmed surface
{
ON_NurbsSurface tmp_nurbssrf;
const ON_Surface* srf = brep->m_S[face.m_si];
const ON_NurbsSurface* nurbs_srf = ON_NurbsSurface::Cast(srf);
if ( !nurbs_srf )
{
// attempt to get NURBS form of this surface
if ( srf->GetNurbForm( tmp_nurbssrf ) )
nurbs_srf = &tmp_nurbssrf;
}
if ( !nurbs_srf )
return;
gluBeginSurface( nobj );
ON_GL( *nurbs_srf,
nobj,
(nurbs_srf->IsRational()) ? GL_MAP2_VERTEX_4 : GL_MAP2_VERTEX_3,
true, knot_scale[0], knot_scale[1]
);
}
if ( bSkipTrims || brep->FaceIsSurface( face.m_face_index ) ) {
gluEndSurface( nobj );
return; // face is trivially trimmed
}
int fli, li, lti, ti;
// any knot scaling applied to the surface must also be applied to
// the parameter space trimming geometry
double xform[4][4]
= {{knot_scale[0][1], 0.0, 0.0, -knot_scale[0][0]*knot_scale[0][1] },
{0.0, knot_scale[1][1], 0.0, -knot_scale[1][0]*knot_scale[1][1] },
{0.0, 0.0, 1.0, 0.0},
{0.0, 0.0, 0.0, 1.0}};
// Add face's 2d trimming loop(s)
const int face_loop_count = face.m_li.Count();
for ( fli = 0; fli < face_loop_count; fli++ )
{
gluBeginTrim( nobj );
li = face.m_li[fli];
const ON_BrepLoop& loop = brep->m_L[li];
const int loop_trim_count = loop.m_ti.Count();
for ( lti = 0; lti < loop_trim_count; lti++ )
{
ti = loop.m_ti[lti];
const ON_BrepTrim& trim = brep->m_T[ti];
ON_GL( trim,
nobj,
GLU_MAP1_TRIM_2,
xform
);
}
gluEndTrim( nobj );
}
gluEndSurface( nobj );
}
}
int
NurbsSurface (Tcl_Interp *interp, int argc, char* argv [])
{
int result = TCL_OK;
GLint uOrder = 4;
GLint vOrder = 4;
GLenum type = GL_MAP2_VERTEX_3;
int nCoords = 3;
FloatArray uKnot = NewFloatArray ();
FloatArray vKnot = NewFloatArray ();
FloatArray cPoint = NewFloatArray ();
GLfloat samplingTolerance = 50.0;
GLfloat displayMode = GLU_FILL;
GLfloat culling = GL_FALSE;
int iarg;
int dlist = 0;
for (iarg = 2; iarg < argc; iarg++) {
int len = (int)strlen (argv [iarg]);
if (strncmp (argv [iarg], "-uorder", len) == 0) {
int val;
iarg++;
if (iarg >= argc) ERRMSG ("No value given for -uorder");
if (Tcl_GetInt (interp, argv [iarg], &val) != TCL_OK ||
val < 2 || val > 8)
ERRMSG2 ("\nInvalid value for -uorder:", argv [iarg]);
uOrder = val;
}
else if (strncmp (argv [iarg], "-vorder", len) == 0) {
int val;
iarg++;
if (iarg >= argc) ERRMSG ("No value given for -vorder");
if (Tcl_GetInt (interp, argv [iarg], &val) != TCL_OK ||
val < 2 || val > 8)
ERRMSG2 ("\nInvalid value for -vorder:", argv [iarg]);
vOrder = val;
}
else if (strncmp (argv [iarg], "-uknots", len) == 0) {
if (uKnot->count != 0) ERRMSG ("uknot values already given");
iarg++;
while (iarg < argc &&
!(argv [iarg][0] == '-' && isalpha(argv [iarg][1]))) {
double val;
if (Tcl_GetDouble (interp, argv [iarg], &val) != TCL_OK)
ERRMSG ("\nError parsing uknot value");
if (uKnot->count > 0 &&
uKnot->value [uKnot->count-1] > val)
ERRMSG ("uknot values not in non-descending order");
AddFloat (uKnot, (GLfloat)val);
iarg++;
}
iarg--;
}
else if (strncmp (argv [iarg], "-vknots", len) == 0) {
if (vKnot->count != 0) ERRMSG ("vknot values already given");
iarg++;
while (iarg < argc &&
!(argv [iarg][0] == '-' && isalpha(argv [iarg][1]))) {
double val;
if (Tcl_GetDouble (interp, argv [iarg], &val) != TCL_OK)
ERRMSG ("\nError parsing uknot value");
if (vKnot->count > 0 &&
vKnot->value [vKnot->count-1] > val)
ERRMSG ("vknot values not in non-descending order");
AddFloat (vKnot, (GLfloat)val);
iarg++;
}
iarg--;
}
else if (strncmp (argv [iarg], "-controlpoints", len) == 0) {
if (cPoint->count != 0) ERRMSG ("controlpoint values already given");
iarg++;
while (iarg < argc &&
!(argv [iarg][0] == '-' && isalpha(argv [iarg][1]))) {
double val;
if (Tcl_GetDouble (interp, argv [iarg], &val) != TCL_OK)
ERRMSG ("\nError parsing uknot value");
AddFloat (cPoint, (GLfloat)val);
iarg++;
}
iarg--;
}
else if (strncmp (argv [iarg], "-type", len) == 0) {
iarg++;
if (iarg >= argc) ERRMSG ("No -type value given");
if (strcmp (argv [iarg], "map2vertex3") ==0) {
type = GL_MAP2_VERTEX_3;
nCoords = 3;
} else if (strcmp (argv [iarg], "map2vertex4") == 0) {
type = GL_MAP2_VERTEX_4;
nCoords = 4;
} else if (strcmp (argv [iarg], "map2color4") == 0) {
type = GL_MAP2_COLOR_4;
nCoords = 4;
} else if (strcmp (argv [iarg], "map2normal") == 0) {
type = GL_MAP2_NORMAL;
nCoords = 3;
} else if (strcmp (argv [iarg], "map2texturecoord1") == 0) {
type = GL_MAP2_TEXTURE_COORD_1;
nCoords = 1;
} else if (strcmp (argv [iarg], "map2texturecoord2") == 0) {
type = GL_MAP2_TEXTURE_COORD_2;
nCoords = 2;
} else if (strcmp (argv [iarg], "map2texturecoord3") == 0) {
type = GL_MAP2_TEXTURE_COORD_3;
nCoords = 3;
} else if (strcmp (argv [iarg], "map2texturecoord4") == 0) {
type = GL_MAP2_TEXTURE_COORD_4;
nCoords = 4;
} else
ERRMSG2 ("not a valid type:", argv [iarg]);
}
else if (strncmp (argv [iarg], "-samplingtolerance", len) == 0) {
double val;
iarg++;
if (iarg >= argc) ERRMSG ("No -samplingtolerance value given");
if (Tcl_GetDouble (interp, argv [iarg], &val) != TCL_OK)
ERRMSG ("\nError parsing sampling tolerance");
samplingTolerance = (GLfloat)val;
}
else if (strncmp (argv [iarg], "-displaymode", len) == 0) {
iarg++;
if (iarg >= argc) ERRMSG ("No -displaymode value given");
if (strcmp (argv [iarg], "fill") == 0) {
displayMode = GLU_FILL;
} else if (strcmp (argv [iarg], "outlinepolygon") == 0) {
displayMode = GLU_OUTLINE_POLYGON;
} else if (strcmp (argv [iarg], "outlinepatch") == 0) {
displayMode = GLU_OUTLINE_PATCH;
} else {
ERRMSG2 ("not a valid display mode:", argv [iarg]);
}
}
else if (strncmp (argv [iarg], "-culling", len) == 0) {
int val;
iarg++;
if (iarg >= argc) ERRMSG ("No -culling value given");
if (Tcl_GetBoolean (interp, argv [iarg], &val) != TCL_OK)
ERRMSG ("\nError parsing culling value");
culling = (GLfloat)val;
}
else {
ERRMSG2 ("invalid option:", argv [iarg]);
}
}
if (vKnot->count == 0 || uKnot->count == 0 || cPoint->count == 0)
ERRMSG ("All of -uknot, -vknot and -cpoint options must be specified");
/* Now try to guess the remaining arguments and call gluNurbsSurface */
{
GLint uKnotCount = uKnot->count;
GLint vKnotCount = vKnot->count;
GLint vStride = nCoords;
GLint uStride = nCoords * (vKnotCount - vOrder);
static GLUnurbsObj* obj = NULL;
if (uStride * (uKnotCount - uOrder) != cPoint->count) {
char buf [80];
sprintf (buf, "%d", uStride * (uKnotCount - uOrder));
ERRMSG2 ("Incorrect number of controlpoint coordinates. Expected ",
buf);
}
/* Theoretically, a nurbs object could be allocated for each
invocation of NurbsSurface and then freed after the creation
of the display list. However, this produces a segmentation
violation on AIX OpenGL 1.0. Thus, only one nurbs object is
ever allocated and never freed.
*/
if (obj == NULL) obj = gluNewNurbsRenderer();
dlist = glGenLists (1);
gluNurbsProperty (obj, GLU_SAMPLING_TOLERANCE, samplingTolerance);
gluNurbsProperty (obj, GLU_DISPLAY_MODE, displayMode);
gluNurbsProperty (obj, GLU_CULLING, culling);
glNewList (dlist, GL_COMPILE);
gluBeginSurface (obj);
gluNurbsSurface (obj, uKnotCount, uKnot->value,
vKnotCount, vKnot->value,
uStride, vStride, cPoint->value,
uOrder, vOrder, type);
gluEndSurface (obj);
/* This is never used because of a bug in AIX OpenGL 1.0.
gluDeleteNurbsObj (obj);
*/
glEndList();
glFlush();
}
done:
DestroyFloatArray (uKnot);
DestroyFloatArray (vKnot);
DestroyFloatArray (cPoint);
if (result == TCL_OK) {
char tmp[128];
sprintf (tmp, "%d", dlist);
Tcl_SetResult(interp, tmp, TCL_VOLATILE);
}
return result;
}
/***************************************************************************
DrawRibbon
****************************************************************************/
static void DrawRibbon(int snum){
int i = 0;
float comx = 0.0,
comy = 0.0,
comz = 0.0;
struct coord *c = state->coords[snum];
for (i=0; i<c->size; i++){
comx += c->rp_ca[i].x;
comy += c->rp_ca[i].y;
comz += c->rp_ca[i].z;
}
comx /= c->size;
comy /= c->size;
comz /= c->size;
GLUnurbsObj *nurbs = gluNewNurbsRenderer();
GLfloat* ctrlpts = E_MALLOC(6*sizeof(GLfloat)*c->size);
for(i=0; i < c->size*6; i+=6){
ctrlpts[i] = c->rp_n[i/6].x - comx;
ctrlpts[i+1] = c->rp_n[i/6].y - comy;
ctrlpts[i+2] = c->rp_n[i/6].z - comz;
ctrlpts[i+3] = c->rp_c[i/6].x - comx;
ctrlpts[i+4] = c->rp_c[i/6].y - comy;
ctrlpts[i+5] = c->rp_c[i/6].z - comz;
}
GLfloat* uknots = E_MALLOC(sizeof(GLfloat)*(2*c->size+4));
for(i=0; i < 2*c->size+4; i++){
if(i>c->size*2+3){
uknots[i]=uknots[c->size*2+3];
}
else{
uknots[i]=i/1.0;
}
}
GLfloat vknots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
glColor3f(0.0, 0.0, 1.0);
glLineWidth(2);
glEnable(GL_AUTO_NORMAL);
glShadeModel(GL_SMOOTH);
glPushMatrix();
gluNurbsCallback(nurbs, GLU_ERROR, (GLvoid(*)())nurbsError);
gluNurbsProperty(nurbs, GLU_V_STEP, 4);
gluNurbsProperty(nurbs, GLU_U_STEP, 4);
gluNurbsProperty(nurbs, GLU_CULLING, GL_TRUE);
gluNurbsProperty(nurbs, GLU_SAMPLING_METHOD, GLU_DOMAIN_DISTANCE);
glShadeModel(GL_SMOOTH);
gluBeginSurface(nurbs);
if(snum%3 == 1){
glColor3f(1.0, 0.0, 0.0);
}
else if(snum%3 == 2){
glColor3f(0.0, 1.0, 0.0);
}
else{
glColor3f(0.0, 1.0, 0.0);
}
gluNurbsSurface(nurbs, //context object
c->size*2+4, //number of u-knots
uknots, //u-knot pointer
8, //number of v-knots
vknots, //v-knot ptr
3, //width of u-control points (u-stride)
3, //width of v-control points (v-stride)
ctrlpts, //control point pointer
4, // u-order of the curve (degree+1)
4, // v-order of the curve (degree+1)
GL_MAP2_TEXTURE_COORD_2 //type
);
gluNurbsSurface(nurbs, //context object
c->size*2+4, //number of u-knots
uknots, //u-knot pointer
8, //number of v-knots
vknots, //v-knot ptr
3, //width of u-control points (u-stride)
3, //width of v-control points (v-stride)
ctrlpts, //control point pointer
4, // u-order of the curve (degree+1)
4, // v-order of the curve (degree+1)
GL_MAP2_VERTEX_3 //type
);
gluEndSurface(nurbs);
glPopMatrix();
}
void
SoNurbsSurface::GLRender(SoGLRenderAction *action)
//
////////////////////////////////////////////////////////////////////////
{
// First see if the object is visible and should be rendered now
if (! shouldGLRender(action))
return;
const SoCoordinateElement *ce =
SoCoordinateElement::getInstance(action->getState());
GLfloat *sKnots, *tKnots, *dstCoords;
GLenum type;
float *fKnots;
int32_t nCoords, uOffset, vOffset;
int32_t nsKnots, ntKnots, nsCoords, ntCoords;
int32_t nDstCoords;
int32_t sOffset, tOffset;
int i, j;
// Check for 0 control points
nCoords = ce->getNum();
if (nCoords == 0)
return;
// Make sure the first current material is sent to GL
SoMaterialBundle mb(action);
mb.sendFirst();
//
// Find the number of steps required for object space tessellation and
// the pixel tolerance used for screen space tessellation.
//
float val = SoComplexityElement::get(action->getState());
if (val < 0.0) val = 0.0;
if (val > 1.0) val = 1.0;
int steps;
if (val < 0.10) steps = 2;
else if (val < 0.25) steps = 3;
else if (val < 0.40) steps = 4;
else if (val < 0.55) steps = 5;
else steps = (int)(powf(val, 3.32)*28) + 2;
float pixTolerance = 104.0*val*val - 252.0*val + 150;
//
// If the surface is being cached, or if the tessellation is in object
// space, use the software NURBS library. Create a software NURBS
// rendering class and use it to make nurbs rendering calls. Since
// the software NURBS library generates triangles, texture mapping
// will happen automatically without having to render a separate
// texture surface.
//
if (SoComplexityTypeElement::get(action->getState()) ==
SoComplexityTypeElement::OBJECT_SPACE)
{
_SoNurbsGLRender *GLRender = new _SoNurbsGLRender();
//
// Set the sampling to be constant across the surface with the
// tessellation to be 'steps' across the S and T parameters
//
GLRender->setnurbsproperty( N_T2D, N_SAMPLINGMETHOD,
N_FIXEDRATE );
GLRender->setnurbsproperty( N_V3D, N_SAMPLINGMETHOD,
N_FIXEDRATE );
GLRender->setnurbsproperty( N_V3DR, N_SAMPLINGMETHOD,
N_FIXEDRATE );
GLRender->setnurbsproperty( N_T2D, N_S_STEPS, steps);
GLRender->setnurbsproperty( N_T2D, N_T_STEPS, steps);
GLRender->setnurbsproperty( N_V3D, N_S_STEPS, steps);
GLRender->setnurbsproperty( N_V3D, N_T_STEPS, steps);
GLRender->setnurbsproperty( N_V3DR, N_S_STEPS, steps);
GLRender->setnurbsproperty( N_V3DR, N_T_STEPS, steps);
// Determine whether a texture coordinate surface must be generated
SbBool doTextures = SoGLTextureEnabledElement::get(action->getState());
// Draw the surface
drawNURBS (GLRender, action->getState(), doTextures);
delete GLRender;
return;
}
if (SoDrawStyleElement::get(action->getState()) ==
SoDrawStyleElement::POINTS) {
//
// Render the control points of the surface. Rendering the points
// of the surface would be very slow, as the Software NURBS library
// would have to be used, and because of the view dependent
// tessellation, points would not necessarily remain visible.
//
glBegin(GL_POINTS);
if (ce->is3D()) {
for (i=0; i<nCoords; i++) {
const SbVec3f & coords3 = ce->get3((int)i);
glVertex3f ((GLfloat)(coords3[0]),
(GLfloat)(coords3[1]),
(GLfloat)(coords3[2]));
}
}
else {
for (i=0; i<nCoords; i++) {
const SbVec4f & coords4 = ce->get4((int)i);
glVertex4f ((GLfloat)(coords4[0]),
(GLfloat)(coords4[1]),
(GLfloat)(coords4[2]),
(GLfloat)(coords4[3]));
}
}
glEnd();
return;
}
//
// Render the NURBS surface using the GLU.
//
GLUnurbsObj *nurbsObj = gluNewNurbsRenderer();
switch (SoDrawStyleElement::get(action->getState())) {
case SoDrawStyleElement::FILLED:
gluNurbsProperty (nurbsObj, (GLenum)GLU_DISPLAY_MODE, GLU_FILL);
break;
case SoDrawStyleElement::LINES:
gluNurbsProperty (nurbsObj, (GLenum)GLU_DISPLAY_MODE, GLU_OUTLINE_POLYGON);
break;
}
gluNurbsProperty (nurbsObj, (GLenum)GLU_SAMPLING_TOLERANCE, (GLfloat)pixTolerance);
//
// Collect the control points and knot vectors into an array suitable
// for sending to the GL. The control points and knot vectors must be
// converted to double precision so that they can be passed to the
// GL NURBS routines.
//
GLfloat *dCoords, *duKnots, *dvKnots;
if (ce->is3D()) {
dCoords = (GLfloat *)new GLfloat[3*nCoords];
for (i=0; i<nCoords; i++) {
const SbVec3f &c3 = ce->get3((int)i);
dCoords[3*i] = (GLfloat)c3[0];
dCoords[3*i+1] = (GLfloat)c3[1];
dCoords[3*i+2] = (GLfloat)c3[2];
}
uOffset = 3;
type = GL_MAP2_VERTEX_3;
}
else {
dCoords = (GLfloat *)new GLfloat[4*nCoords];
for (i=0; i<nCoords; i++) {
const SbVec4f &c4 = ce->get4((int)i);
dCoords[4*i] = (GLfloat)c4[0];
dCoords[4*i+1] = (GLfloat)c4[1];
dCoords[4*i+2] = (GLfloat)c4[2];
dCoords[4*i+3] = (GLfloat)c4[3];
}
uOffset = 4;
type = GL_MAP2_VERTEX_4;
}
vOffset = uOffset * numUControlPoints.getValue();
fKnots = (float *)uKnotVector.getValues(0);
duKnots = (GLfloat *)new GLfloat[uKnotVector.getNum()];
for (i=0; i<uKnotVector.getNum(); i++)
duKnots[i] = (GLfloat)fKnots[i];
fKnots = (GLfloat *)vKnotVector.getValues(0);
dvKnots = (GLfloat *)new GLfloat[vKnotVector.getNum()];
for (i=0; i<vKnotVector.getNum(); i++)
dvKnots[i] = (GLfloat)fKnots[i];
// Texture mapping. If doTextures == TRUE
// we are drawing textures. If the textureCoordinateBinding is
// DEFAULT, we have to build a default NURBS surface for the texture
// coordinates, otherwise we use the texture coordinates in the texture
// element.
// If there is a software texture function defined, then we have to
// create a texture nurb surface with the same number of points and
// knots as the original surface, and call the texture coordinate function
// at each vertex.
SbBool doTextures = SoGLTextureEnabledElement::get(action->getState());
if(doTextures) {
switch (SoTextureCoordinateElement::getType(action->getState())) {
// software texture functions
case SoTextureCoordinateElement::FUNCTION:
{
// generate S and T coords from U and V coords
SbVec3f coord;
SbVec2f stCoord;
int offset;
SoTextureCoordinateBundle tb(action, TRUE);
nsCoords = numUControlPoints.getValue();
ntCoords = numVControlPoints.getValue();
sKnots = duKnots;
tKnots = dvKnots;
nsKnots = uKnotVector.getNum();
ntKnots = vKnotVector.getNum();
nDstCoords = nsCoords * ntCoords;
dstCoords = (GLfloat *)new GLfloat[nDstCoords * 2];
for(int v = 0; v < ntCoords; v++) {
for(int u = 0; u < nsCoords; u++) {
if (ce->is3D()) {
offset = 3 * (v * (int)nsCoords + u);
coord[0] = dCoords[offset + 0];
coord[1] = dCoords[offset + 1];
coord[2] = dCoords[offset + 2];
}
else {
offset = 4 * (v * (int)nsCoords + u);
coord[0] = dCoords[offset + 0] / dCoords[offset + 3];
coord[1] = dCoords[offset + 1] / dCoords[offset + 3];
coord[2] = dCoords[offset + 2] / dCoords[offset + 3];
}
const SbVec4f &tc = tb.get(coord, SbVec3f(0.0, 1.0, 0.0));
dstCoords[(v * (int)nsCoords + u) * 2 + 0] = tc[0];
dstCoords[(v * (int)nsCoords + u) * 2 + 1] = tc[1];
}
}
break;
}
// texture coordinates defined from texture node
case SoTextureCoordinateElement::EXPLICIT:
// get texture coordinates from texture node
const SoTextureCoordinateElement *te =
SoTextureCoordinateElement::getInstance(action->getState());
int32_t nstCoords = te->getNum();
if (nstCoords < 1) {
// Default texture coordinates are computed by defining
// a bezier surface that is defined in the same valid
// parameter space as the geometric surface. The valid
// parameter space is defined based on the order and knot
// vector. The coordinates go from 0 to one and the knot
// vectors span the valid range of the geometric surface.
// The knot vectors default to 0 and 1 in the event of bogus
// input data.
int uOrder, vOrder;
GLfloat sKnotVal1, sKnotVal2, tKnotVal1, tKnotVal2;
uOrder = uKnotVector.getNum() - numUControlPoints.getValue();
vOrder = vKnotVector.getNum() - numVControlPoints.getValue();
if ((uOrder > 0) && (uOrder < uKnotVector.getNum()))
sKnotVal1 = duKnots[uOrder-1];
else
sKnotVal1 = 0;
if ((uOrder > 0) && (uOrder < uKnotVector.getNum()))
sKnotVal2 = duKnots[uKnotVector.getNum()-uOrder];
else
sKnotVal2 = 1;
if ((vOrder > 0) && (vOrder < vKnotVector.getNum()))
tKnotVal1 = dvKnots[vOrder-1];
else
tKnotVal1 = 0;
if ((vOrder > 0) && (vOrder < vKnotVector.getNum()))
tKnotVal2 = dvKnots[vKnotVector.getNum()-vOrder];
else
tKnotVal2 = 1;
// do a linear 2x2 array
nsKnots = 4;
ntKnots = 4;
sKnots = (GLfloat *)new GLfloat[4];
tKnots = (GLfloat *)new GLfloat[4];
sKnots[0] = sKnots[1] = sKnotVal1;
tKnots[0] = tKnots[1] = tKnotVal1;
sKnots[2] = sKnots[3] = sKnotVal2;
tKnots[2] = tKnots[3] = tKnotVal2;
// allocate a 2 x 2 array of GLfloat[2]'s
nsCoords = 2;
ntCoords = 2;
nDstCoords = nsCoords * ntCoords * 2;
dstCoords = (GLfloat *)new GLfloat[nDstCoords];
for(i = 0; i < 2; i++) {
for(j = 0; j < 2; j++) {
dstCoords[(i * 2 + j) * 2 + 0] = j;
dstCoords[(i * 2 + j) * 2 + 1] = i;
}
}
}
else {
// get knot vectors from this node
nsKnots = sKnotVector.getNum();
fKnots = (float *)sKnotVector.getValues(0);
sKnots = (GLfloat *)new GLfloat[nsKnots];
for (i=0; i < nsKnots; i++)
sKnots[i] = (GLfloat)fKnots[i];
ntKnots = tKnotVector.getNum();
fKnots = (float *)tKnotVector.getValues(0);
tKnots = (GLfloat *)new GLfloat[ntKnots];
for (i=0; i < ntKnots; i++)
tKnots[i] = (GLfloat)fKnots[i];
nsCoords = numSControlPoints.getValue();
ntCoords = numTControlPoints.getValue();
nDstCoords = 2 * nstCoords;
dstCoords = (GLfloat *)new GLfloat[nDstCoords];
for(i = 0; i < nstCoords; i++) {
const SbVec2f &tc2 = te->get2(i);
dstCoords[2*i] = (GLfloat)tc2[0];
dstCoords[2*i+1] = (GLfloat)tc2[1];
}
}
break;
}
sOffset = 2;
tOffset = sOffset * nsCoords;
}
//
// Draw the NURBS surface. Begin the surface. Then load the texture
// map as a nurbs surface. Then, draw the geometric surface followed
// by all of its trim curves. Then, end the surface.
//
glEnable(GL_AUTO_NORMAL);
// Get one camera based element so that this node will be registered
// with the cache. If the camera changes, this element will cause
// the cache to be blown for this node and the nurbs surface will be
// regenerated.
SbMatrix vMat = SoViewingMatrixElement::get (action->getState());
SbMatrix mMat = SoModelMatrixElement::get (action->getState());
// Begin the surface.
gluBeginSurface(nurbsObj);
// Draw the texture surface
if(doTextures) {
// send down nurbs surface, then free memory
gluNurbsSurface(nurbsObj, (GLint)nsKnots, sKnots,
(GLint)ntKnots, tKnots,
(GLint)sOffset, (GLint)tOffset, dstCoords,
(GLint)(nsKnots - nsCoords),
(GLint)(ntKnots - ntCoords),
GL_MAP2_TEXTURE_COORD_2);
// delete knots if not sharing them with the surface description
// (in the case of software texture coordinates only)
if(sKnots != duKnots) {
delete [] sKnots;
delete [] tKnots;
}
delete [] dstCoords;
}
gluNurbsSurface (nurbsObj, (GLint)(uKnotVector.getNum()), duKnots,
(GLint)(vKnotVector.getNum()), dvKnots,
(GLint)uOffset, (GLint)vOffset, dCoords,
(GLint)(uKnotVector.getNum() -
numUControlPoints.getValue()),
(GLint)(vKnotVector.getNum() -
numVControlPoints.getValue()),
type);
//
// Get all of the trim curves and use them to trim the surface.
//
SoProfile *profile;
const SoNodeList &trimNodes = SoProfileElement::get(action->getState());
SbBool haveTrim = FALSE;
float *trimCoords, *trimKnots;
int32_t numTrimCoords, numKnots, offset;
int numTrims = trimNodes.getLength();
int floatsPerVec;
//
// For each trim curve, check its linkage to find out if it should be
// continued on to the previous trim curve or if it should begin a
// new trim curve. Then, send the trim to the NURBS library.
//
for (i=0; i<numTrims; i++)
{
GLfloat *dTrimCoords;
GLfloat *dtmp;
float *ftmp;
// Get the trim curve.
profile = (SoProfile *)trimNodes[(int) i];
profile->getTrimCurve (action->getState(), numTrimCoords,
trimCoords, floatsPerVec,
numKnots, trimKnots);
// Check for degenerate trim curves
if (numTrimCoords == 0)
continue;
// Check the linkage.
if ((profile->linkage.getValue() == SoProfileElement::START_FIRST) ||
(profile->linkage.getValue() == SoProfileElement::START_NEW))
{
if (haveTrim)
gluEndTrim(nurbsObj);
gluBeginTrim(nurbsObj);
haveTrim = TRUE;
}
// Set the data type of the control points to non-rational or rational
if (floatsPerVec == 2)
type = (GLenum)GLU_MAP1_TRIM_2;
else
type = (GLenum)GLU_MAP1_TRIM_3;
offset = floatsPerVec;
dTrimCoords = new GLfloat[numTrimCoords*floatsPerVec];
dtmp = dTrimCoords;
ftmp = trimCoords;
for (j=0; j<floatsPerVec*numTrimCoords; j++)
*dtmp++ = (GLfloat)(*ftmp++);
if (numKnots == 0)
{
// Send down a Piecewise Linear Trim Curve
gluPwlCurve (nurbsObj, (GLint)numTrimCoords, dTrimCoords,
(GLint)offset, type);
}
else
{
// Send down a NURBS Trim Curve
GLfloat *dTrimKnots = new GLfloat[numKnots];
dtmp = dTrimKnots;
ftmp = trimKnots;
for (j=0; j<numKnots; j++)
*dtmp++ = (GLfloat)(*ftmp++);
gluNurbsCurve (nurbsObj, (GLint)numKnots, dTrimKnots,
(GLint)offset, dTrimCoords,
(GLint)(numKnots - numTrimCoords), type);
delete[] dTrimKnots;
delete[] trimKnots;
}
delete[] dTrimCoords;
delete[] trimCoords;
}
if (haveTrim)
gluEndTrim(nurbsObj);
gluEndSurface(nurbsObj);
gluDeleteNurbsRenderer(nurbsObj);
glDisable(GL_AUTO_NORMAL);
delete[] dvKnots;
delete[] duKnots;
delete[] dCoords;
}
/***************************************************************************
Draw3dRibbon
****************************************************************************/
static void Draw3dRibbon(int snum){
int i = 0;
float comx = 0.0,
comy = 0.0,
comz = 0.0;
float *cp = E_MALLOC(3*sizeof(float));
float *inA = E_MALLOC(3*sizeof(float));
float *inB = E_MALLOC(3*sizeof(float));
float *inC = E_MALLOC(3*sizeof(float));
float *out = E_MALLOC(3*sizeof(float));
struct coord *c = state->coords[snum];
for (i=0; i<c->size; i++){
comx += c->rp_ca[i].x;
comy += c->rp_ca[i].y;
comz += c->rp_ca[i].z;
}
comx /= c->size;
comy /= c->size;
comz /= c->size;
GLUnurbsObj *nurbs = gluNewNurbsRenderer();
GLfloat* ctrlpts = E_MALLOC(12*sizeof(GLfloat)*(c->size-1));
GLfloat* tracepts = E_MALLOC(3*sizeof(GLfloat)*c->size-1);
for(i=0; i < c->size-1; i++){
if((i) %2){
ctrlpts[i*12] = c->rp_c[i].x - comx;
ctrlpts[i*12+1] = c->rp_c[i].y - comy;
ctrlpts[i*12+2] = c->rp_c[i].z - comz;
}
else{
ctrlpts[i*12] = c->rp_o[i].x - comx;
ctrlpts[i*12+1] = c->rp_o[i].y - comy;
ctrlpts[i*12+2] = c->rp_o[i].z - comz;
}
inA[0] = c->rp_c[i].x - c->rp_ca[i].x;
inA[1] = c->rp_c[i].y - c->rp_ca[i].y;
inA[2] = c->rp_c[i].z - c->rp_ca[i].z;
inB[0] = c->rp_c[i].x - c->rp_o[i].x;
inB[1] = c->rp_c[i].y - c->rp_o[i].y;
inB[2] = c->rp_c[i].z - c->rp_o[i].z;
cross(cp, inA, inB);
normalize(cp);
inC[0] = ((c->rp_c[i].x + c->rp_ca[i].x) / 2) - comx;
inC[1] = ((c->rp_c[i].y + c->rp_ca[i].y) / 2) - comy;
inC[2] = ((c->rp_c[i].z + c->rp_ca[i].z) / 2) - comz;
//cross(out, cp, inC);
//normalize(out);
ctrlpts[i*12+3] = inC[0] + cp[0];
ctrlpts[i*12+4] = inC[1] + cp[1];
ctrlpts[i*12+5] = inC[2] + cp[2];
if((i) %2){
ctrlpts[i*12+6] = c->rp_o[i].x - comx;
ctrlpts[i*12+7] = c->rp_o[i].y - comy;
ctrlpts[i*12+8] = c->rp_o[i].z - comz;
}
else{
ctrlpts[i*12+6] = c->rp_c[i].x - comx;
ctrlpts[i*12+7] = c->rp_c[i].y - comy;
ctrlpts[i*12+8] = c->rp_c[i].z - comz;
}
ctrlpts[i*12+9] = inC[0] - cp[0];
ctrlpts[i*12+10] = inC[1] - cp[1];
ctrlpts[i*12+11] = inC[2] - cp[2];
tracepts[i] = inC[0];
tracepts[i+1] = inC[1];
tracepts[i+2] = inC[2];
// printf("[%f, %f, %f], [%f, %f, %f] \n",
// cp[0], cp[1], cp[2],
// inC[0], inC[1], inC[2]);
// printf("[%f, %f, %f], [%f, %f, %f], [%f, %f, %f], [%f, %f, %f] \n",
// ctrlpts[i], ctrlpts[i+1] ,ctrlpts[i+2], ctrlpts[i+3], ctrlpts[i+4],
// ctrlpts[i+5], ctrlpts[i+6], ctrlpts[i+7], ctrlpts[i+8], ctrlpts[i+9],
// ctrlpts[i+10], ctrlpts[i+11]);
}
free(cp);
free(inA);
free(inB);
free(inC);
free(out);
GLfloat* uknots = E_MALLOC(sizeof(GLfloat)*(c->size+3));
for(i=0; i < c->size+3; i++){
if(i<c->size+1 && i>2){
uknots[i] = uknots[i-1]+1.0;
}
else if(i<3){
uknots[i] = 0.0;
}
else{
uknots[i] = uknots[i-1];
}
}
GLfloat vknots[8] = {0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0};
GLfloat* knots = E_MALLOC(sizeof(GLfloat)*(c->size+4));
for(i=0; i < c->size+4; i++){
if(i>c->size+2){
knots[i]=knots[c->size+2];
}
else{
knots[i]=i/1.0-i%1;
}
}
glColor3f(0.0, 0.0, 1.0);
glEnable(GL_AUTO_NORMAL);
glShadeModel(GL_SMOOTH);
glPushMatrix();
gluNurbsCallback(nurbs, GLU_ERROR, (GLvoid(*)())nurbsError);
gluNurbsProperty(nurbs, GLU_V_STEP, 4);
gluNurbsProperty(nurbs, GLU_U_STEP, 4);
gluNurbsProperty(nurbs, GLU_CULLING, GL_TRUE);
gluNurbsProperty(nurbs, GLU_SAMPLING_METHOD, GLU_DOMAIN_DISTANCE);
glShadeModel(GL_SMOOTH);
gluBeginSurface(nurbs);
gluNurbsSurface(nurbs, //context object
c->size+3, //number of u-knots
uknots, //u-knot pointer
8, //number of v-knots
vknots, //v-knot ptr
3, //width of u-control points (u-stride)
3, //width of v-control points (v-stride)
ctrlpts, //control point pointer
4, // u-order of the curve (degree+1)
4, // v-order of the curve (degree+1)
GL_MAP2_TEXTURE_COORD_2 //type
);
gluNurbsSurface(nurbs, //context object
c->size+3, //number of u-knots
uknots, //u-knot pointer
8, //number of v-knots
vknots, //v-knot ptr
3, //width of u-control points (u-stride)
3, //width of v-control points (v-stride)
ctrlpts, //control point pointer
4, // u-order of the curve (degree+1)
4, // v-order of the curve (degree+1)
GL_MAP2_NORMAL //type
);
gluNurbsSurface(nurbs, //context object
c->size+3, //number of u-knots
uknots, //u-knot pointer
8, //number of v-knots
vknots, //v-knot ptr
3, //width of u-control points (u-stride)
3, //width of v-control points (v-stride)
ctrlpts, //control point pointer
4, // u-order of the curve (degree+1)
4, // v-order of the curve (degree+1)
GL_MAP2_VERTEX_3 //type
);
gluEndSurface(nurbs);
/*
gluBeginCurve(nurbs);
gluNurbsCurve(nurbs, //context object
c->size+4, //number of knots
knots, //knot pointer
3, //width of control points
tracepts, //control point pointer
4, //order of the curve (degree+1)
GL_MAP1_VERTEX_3 //type
);
gluEndCurve(nurbs);
*/
glPopMatrix();
}