void display(void)
{
ReadData();
glutSetWindow(id1);
/* clear all pixels, clear depth bit */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* set up projection transformation */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
/* for perspective projection specify a viewing frustum */
glFrustum(JPOT$1, JPOT$2, JPOT$3, JPOT$4, JPOT$5, JPOT$6);
/* set up viewing transformation */
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* specify viewpoint */
gluLookAt(JPOT$7, JPOT$8, JPOT$9, JPOT$10, JPOT$11, JPOT$12, JPOT$13, JPOT$14, JPOT$15);
glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
glGetFloatv(GL_MODELVIEW_MATRIX, (GLfloat *) tmat);
transpose(tmat);
inverse(tmat);
transpose(tmat);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_green);
glutSolidTeapot(1.0);
drawaxes();
glFlush();
}
void display()
{
if (ALIASMODE == 0) {
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_LINE_SMOOTH);
glHint(GL_LINE_SMOOTH_HINT, GL_FASTEST);
}
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity(); /* clear the matrix */
gluLookAt(2, 4, 5, 0 , 0 , 0, 0, 1, 0);
glMaterialfv(GL_FRONT, GL_AMBIENT, material_ambient);
glMaterialfv(GL_FRONT, GL_DIFFUSE, material_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, material_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, material_shininess);
/*$$$
[Red, f, 0.0, 0.0, 1.0, c], [Green, f, 0.0, 0.0, 1.0, c],[Blue, f, 0.0, 0.0, 1.0, c]
$$$*/
material_emission[0] = JPOT$1;
material_emission[1] = JPOT$2;
material_emission[2] = JPOT$3;
glMaterialfv(GL_FRONT, GL_EMISSION, material_emission);
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
drawaxes();
glTranslatef(0, 0, -3);
glutSolidSphere(1.0, 30, 30);;
glFlush();
}
void display1()
{
glutSetWindow(id1);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
/*$$$
[Frus-left, f, -1.0, -5.0, 5.0, c],
[Frus-right, f, 1.0, -5.0, 5.0, c],
[Frus-bottom, f, -1.0, -5.0, 5.0, c],
[Frus-top, f, 1.0, -5.0, 5.0, n],
[Frus-near, f, 2.0, 0.1, 20.0, c],
[Frus-far, f, 20.0, 0.1, 30.0, c]
$$$*/
glFrustum(JPOT$1, JPOT$2, JPOT$3, JPOT$4, JPOT$5, JPOT$6);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(2, 4, 10, 0 , 0 , 0, 0, 1, 0);
glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
drawtable();
drawaxes();
drawpot();
glTranslatef(2, 0,- 10);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_red);
glutSolidSphere(1.0, 40, 40);
glFlush();
}
void display2()
{
glutSetWindow(id2);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
/*$$$
[Orth-left, f, -5.0, -10.0, 10.0, n],
[Orth-right, f, 5.0, -10.0, 10.0, c],
[Orth-bottom, f, -5.0, -10.0, 10.0, c],
[Orth-top, f, 5.0, -10.0, 10.0, n],
[Orth-near, f, 2.0, -10.0, 10.0, c],
[Orth-far, f, 20.0, 10.0, 30.0, c]
$$$*/
glOrtho(JPOT$7, JPOT$8, JPOT$9, JPOT$10, JPOT$11, JPOT$12);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(2, 4, 10, 0 , 0 , 0, 0, 1, 0);
glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
drawtable();
drawaxes();
drawpot();
glTranslatef(2, 0,- 10);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_red);
glutSolidSphere(1.0, 40, 40);
glFlush();
}
void display(void) {
glClear (GL_COLOR_BUFFER_BIT);
glColor3f (1.0, 1.0, 1.0);
drawaxes(WMIN, WMAX, 100,10);
Draw(Tree.first);
//midpointcircle(10, 100, 100 , 0, WMAX);
//drawline(10, 40, 30, 100, 0, 200);
glFlush ();
}
void display(){
glClear(GL_COLOR_BUFFER_BIT);
drawaxes();
glFlush();
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
gluLookAt(2, 4, 5, 0 , 0 , 0, 0, 1, 0);
glMaterialfv(GL_FRONT, GL_AMBIENT, material_ambient);
glMaterialfv(GL_FRONT, GL_DIFFUSE, material_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, material_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, material_shininess);
glMaterialfv(GL_FRONT, GL_EMISSION, material_emission);
/*$$$
[Light X, f, 1.0, -10.0, 10.0, c],
[Light Y, f, 1.0, -10.0, 10.0, c],
[Light Z, f, 1.0, -10.0, 10.0, c],
[Light W, f, 1.0, 0.0, 1.0, c]
$$$*/
light_position[0] =JPOT$1; light_position[1] = JPOT$2; light_position[2] = JPOT$3; light_position[3] = JPOT$4;
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
/*$$$
[Amb_Red, f, 0.0, 0.0, 1.0, n],
[Amb_Green, f, 0.0, 0.0, 1.0, c],
[Amb_Blue, f, 0.0, 0.0, 1.0, c]$$$*/
light_ambient[0] =JPOT$5; light_ambient[1] = JPOT$5; light_ambient[2] = JPOT$7;
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
/*$$$
[Diff_Red, f, 1.0, 0.0, 1.0, n],
[Diff_Green, f, 1.0, 0.0, 1.0, c],
[Diff_Blue, f, 1.0, 0.0, 1.0, c]
$$$*/
light_diffuse[0] =JPOT$8; light_diffuse[1] = JPOT$9; light_diffuse[2] = JPOT$10;
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
/*$$$
[Spec_Red, f, 1.0, 0.0, 1.0, n],
[Spec_Green, f, 1.0, 0.0, 1.0, c],
[Spec_Blue, f, 1.0, 0.0, 1.0, c]
$$$*/
light_specular[0] = JPOT$11; light_specular[1] = JPOT$12; light_specular[2] = JPOT$13;
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glPushMatrix();
glTranslatef(light_position[0], light_position[1], light_position[2] - 0.2);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_red);
glScalef(0.1, 0.1, 0.1);
glutSolidSphere(1.0, 8, 8);
glPopMatrix();
drawaxes();
glTranslatef(0, 0, -3);
glutSolidTeapot(1.0);
glFlush();
}
void display(void)
{
glutSetWindow(id1);
/* clear all pixels, clear depth bit */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* set up projection transformation */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
/* for perspective projection specify a viewing frustum */
/*$$$
[left, f, -1.0, -10.0, 10.0, c],
[right, f, 1.0, -10.0, 10.0, c],
[bottom, f, -1.0, -10.0, 10.0, c],
[top, f, 1.0, -10.0, 10.0, n],
[near, f, 2.0, 0.1, 20.0, c],
[far, f, 20.0, 0.1, 30.0, c]
$$$*/
glFrustum(JPOT$1, JPOT$2, JPOT$3, JPOT$4, JPOT$5, JPOT$6);
/* set up viewing transformation */
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* specify viewpoint */
/*$$$
[eye-x, f, 2.0, -10, 10, n],
[eye-y, f, 4.0, -10, 10, c],
[eye-z, f, 13.0, -20, 20, c],
[center-x, f, 0.0, -5.0, 5.0, n],
[center-y, f, 0.0, -5.0, 5.0, c],
[center-z, f, 0.0, -5.0, 5.0, c],
[up-x, f, 0, -1.0, 1.0, n],
[up-y, f, 1.0, -1.0, 1.0, c],
[up-z, f, 0.0, -1.0, 1.0, c]
$$$*/
gluLookAt(JPOT$7, JPOT$8, JPOT$9, JPOT$10, JPOT$11, JPOT$12, JPOT$13, JPOT$14, JPOT$15);
glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
glGetFloatv(GL_MODELVIEW_MATRIX, (GLfloat *) tmat);
transpose(tmat);
inverse(tmat);
transpose(tmat);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_green);
glutSolidTeapot(1.0);
drawaxes();
glFlush();
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
/* clear the matrix */
glLoadIdentity();
gluLookAt(5, 5, 10, 0 , 0 , 0, 0, 1, 0);
glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
drawaxes();
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_green);
/*$$$
[X, f, 1.0, -5.0, 5.0, n], [Y, f, 1.0, -5.0, 5.0, c], [Z, f, 1.0, -5.0, 5.0, c]
$$$*/
glScalef(JPOT$1, JPOT$2, JPOT$3);
glutSolidTeapot(1.0);
drawlocalaxes();
glFlush();
}
void display()
{
ReadData();
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glLoadIdentity();
if (JPOT$swap == 1) {
gluLookAt(2, 4, 15, 0 , 0 , 0, 0, 1, 0);
} /*end swap*/
if (JPOT$swap == 0) {
gluLookAt(-2, 4, -15, 0, 0, 0, 0, 1, 0);
} /*end swap*/
glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
drawaxes();
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_green);
glutSolidTeapot(1.0);
glFlush();
}
void
world_display(void)
{
GLfloat light_pos[] = { 0.0, 0.0, 1.0, 0.0 };
double length;
float l[3];
l[0] = lookat[3].value - lookat[0].value;
l[1] = lookat[4].value - lookat[1].value;
l[2] = lookat[5].value - lookat[2].value;
length = normalize(l);
invert(modelview, inverse);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (world_draw) {
glEnable(GL_LIGHTING);
glPushMatrix();
glMultMatrixd(inverse);
glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
glPopMatrix();
drawmodel();
glDisable(GL_LIGHTING);
}
glPushMatrix();
glMultMatrixd(inverse);
glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
/* draw the axis and eye vector */
glPushMatrix();
glColor3ub(0, 0, 255);
glBegin(GL_LINE_STRIP);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, -1.0*length);
glVertex3f(0.1, 0.0, -0.9*length);
glVertex3f(-0.1, 0.0, -0.9*length);
glVertex3f(0.0, 0.0, -1.0*length);
glVertex3f(0.0, 0.1, -0.9*length);
glVertex3f(0.0, -0.1, -0.9*length);
glVertex3f(0.0, 0.0, -1.0*length);
glEnd();
glColor3ub(255, 255, 0);
glRasterPos3f(0.0, 0.0, -1.1*length);
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, 'e');
glColor3ub(255, 0, 0);
glScalef(0.4, 0.4, 0.4);
drawaxes();
glPopMatrix();
invert(projection, inverse);
glMultMatrixd(inverse);
/* draw the viewing frustum */
glColor3f(0.2, 0.2, 0.2);
glBegin(GL_QUADS);
glVertex3i(1, 1, 1);
glVertex3i(-1, 1, 1);
glVertex3i(-1, -1, 1);
glVertex3i(1, -1, 1);
glEnd();
glColor3ub(128, 196, 128);
glBegin(GL_LINES);
glVertex3i(1, 1, -1);
glVertex3i(1, 1, 1);
glVertex3i(-1, 1, -1);
glVertex3i(-1, 1, 1);
glVertex3i(-1, -1, -1);
glVertex3i(-1, -1, 1);
glVertex3i(1, -1, -1);
glVertex3i(1, -1, 1);
glEnd();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4f(0.2, 0.2, 0.4, 0.5);
glBegin(GL_QUADS);
glVertex3i(1, 1, -1);
glVertex3i(-1, 1, -1);
glVertex3i(-1, -1, -1);
glVertex3i(1, -1, -1);
glEnd();
glDisable(GL_BLEND);
glPopMatrix();
glutSwapBuffers();
}
void
world_display(void)
{
double length;
float l[3];
GLfloat pos[4], lKa[4], lKd[4], lKs[4];
GLfloat dir[3], mKa[4], mKd[4], mKs[4], mKe[4];
GLfloat lmKa[4];
cell_vector(pos, light_pos, 4);
cell_vector(lKa, light_Ka, 4);
cell_vector(lKd, light_Kd, 4);
cell_vector(lKs, light_Ks, 4);
cell_vector(dir, spot_direction, 3);
cell_vector(mKa, material_Ka, 4);
cell_vector(mKd, material_Kd, 4);
cell_vector(mKs, material_Ks, 4);
cell_vector(mKe, material_Ke, 4);
cell_vector(lmKa, lmodel_Ka, 4);
glLightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER, local_viewer.value);
glLightModelf(GL_LIGHT_MODEL_TWO_SIDE, two_side.value);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmKa);
glMaterialfv(GL_FRONT, GL_AMBIENT, mKa);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mKd);
glMaterialfv(GL_FRONT, GL_SPECULAR, mKs);
glMaterialfv(GL_FRONT, GL_EMISSION, mKe);
glMaterialf(GL_FRONT, GL_SHININESS, material_Se.value);
glLightfv(GL_LIGHT0, GL_AMBIENT, lKa);
glLightfv(GL_LIGHT0, GL_DIFFUSE, lKd);
glLightfv(GL_LIGHT0, GL_SPECULAR, lKs);
glLighti(GL_LIGHT0, GL_SPOT_EXPONENT, (int)spot_exponent.value);
if (spot_cutoff.value > 90)
glLighti(GL_LIGHT0, GL_SPOT_CUTOFF, 180);
else
glLighti(GL_LIGHT0, GL_SPOT_CUTOFF, (int)spot_cutoff.value);
glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, Kc.value);
glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, Kl.value);
glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, Kq.value);
l[0] = at[0] - eye[0];
l[1] = at[1] - eye[1];
l[2] = at[2] - eye[2];
invert(modelview, inverse);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glMultMatrixd(inverse);
glTranslatef(l[0], l[1], l[2]);
glColor3fv(lKd);
glBegin(GL_LINE_STRIP);
if (spot_cutoff.value > 90)
glVertex3f(0, 0, 0);
else
glVertex3f(pos[0]+spot_direction[0].value,
pos[1]+spot_direction[1].value,
pos[2]+spot_direction[2].value);
if (pos[3] == 0) /* 10.0 = 'infinite' light */
glVertex3f(pos[0]*10.0,pos[1]*10.0,pos[2]*10.0);
else
glVertex3f(pos[0], pos[1], pos[2]);
glEnd();
glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, dir);
glLightfv(GL_LIGHT0, GL_POSITION, pos);
glPopMatrix();
length = normalize(l);
if (world_draw) {
glEnable(GL_LIGHTING);
if (pmodel)
drawmodel();
else
glutSolidTorus(0.25, 0.75, 28, 28);
glDisable(GL_LIGHTING);
}
#if 0
#define TESS 20
glNormal3f(0.0, 1.0, 0.0);
for (i = 0; i < TESS; i++) {
glBegin(GL_TRIANGLE_STRIP);
for (j = 0; j <= TESS; j++) {
glVertex3f(-1+(float)i/TESS*2, -1.0, -1+(float)j/TESS*2);
glVertex3f(-1+(float)(i+1)/TESS*2, -1.0, -1+(float)j/TESS*2);
}
glEnd();
}
#endif
glPushMatrix();
glMultMatrixd(inverse);
/* draw the axis and eye vector */
glPushMatrix();
glColor3ub(0, 0, 255);
glBegin(GL_LINE_STRIP);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, -1.0*length);
glVertex3f(0.1, 0.0, -0.9*length);
glVertex3f(-0.1, 0.0, -0.9*length);
glVertex3f(0.0, 0.0, -1.0*length);
glVertex3f(0.0, 0.1, -0.9*length);
glVertex3f(0.0, -0.1, -0.9*length);
glVertex3f(0.0, 0.0, -1.0*length);
glEnd();
glColor3ub(255, 255, 0);
glRasterPos3f(0.0, 0.0, -1.1*length);
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, 'e');
glColor3ub(255, 0, 0);
glScalef(0.4, 0.4, 0.4);
drawaxes();
glPopMatrix();
invert(projection, inverse);
glMultMatrixd(inverse);
/* draw the viewing frustum */
glColor3f(0.2, 0.2, 0.2);
glBegin(GL_QUADS);
glVertex3i(1, 1, 1);
glVertex3i(-1, 1, 1);
glVertex3i(-1, -1, 1);
glVertex3i(1, -1, 1);
glEnd();
glColor3ub(128, 196, 128);
glBegin(GL_LINES);
glVertex3i(1, 1, -1);
glVertex3i(1, 1, 1);
glVertex3i(-1, 1, -1);
glVertex3i(-1, 1, 1);
glVertex3i(-1, -1, -1);
glVertex3i(-1, -1, 1);
glVertex3i(1, -1, -1);
glVertex3i(1, -1, 1);
glEnd();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4f(0.2, 0.2, 0.4, 0.5);
glBegin(GL_QUADS);
glVertex3i(1, 1, -1);
glVertex3i(-1, 1, -1);
glVertex3i(-1, -1, -1);
glVertex3i(1, -1, -1);
glEnd();
glDisable(GL_BLEND);
glPopMatrix();
glutSwapBuffers();
}
/*display 2*/
void display2(void)
{
ReadData();
glutSetWindow(id2);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
/* specify viewpoint */
gluLookAt(viewer[0], viewer[1], viewer[2], 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_green);
glutSolidTeapot(1.0);
drawaxes();
if (inverse_exist == 0) {
glPushMatrix();
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat_amb_diff_white);
for (i = 0; i < 4; i++)
for (j = 0; j < 4; j++)
matrix[i*4+j] = tmat[i][j];
glMultMatrixf(matrix);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glLineWidth(2.0);
/* draw the actual frustum */
left_far = ( JPOT$1 * JPOT$6 ) / JPOT$5;
right_far = ( JPOT$2* JPOT$6 ) / JPOT$5;
top_far = ( JPOT$4 * JPOT$6 ) / JPOT$5;
bottom_far = ( JPOT$3 * JPOT$6 ) / JPOT$5;
/* Draw the front face of the frustum */
glBegin(GL_POLYGON);
glVertex3f(JPOT$1, JPOT$4, -JPOT$5);
glVertex3f(JPOT$1, JPOT$3, -JPOT$5);
glVertex3f(JPOT$2, JPOT$3, -JPOT$5);
glVertex3f(JPOT$2, JPOT$4, -JPOT$5);
glEnd();
/* Draw the left face of the frustum */
glBegin(GL_POLYGON);
glVertex3f(left_far, bottom_far, -JPOT$6);
glVertex3f(JPOT$1, JPOT$3, -JPOT$5);
glVertex3f(JPOT$1, JPOT$4, -JPOT$5);
glVertex3f(left_far, top_far, -JPOT$6);
glEnd();
/* Draw the right face of the frustum */
glBegin(GL_POLYGON);
glVertex3f(right_far, bottom_far, -JPOT$6);
glVertex3f(JPOT$2, JPOT$3, -JPOT$5);
glVertex3f(JPOT$2, JPOT$4, -JPOT$5);
glVertex3f(right_far, top_far, -JPOT$6);
glEnd();
/* Draw the bottom face of the frustum */
glBegin(GL_POLYGON);
glVertex3f(JPOT$1, JPOT$3, -JPOT$5);
glVertex3f(left_far, bottom_far, -JPOT$6);
glVertex3f(right_far, bottom_far, -JPOT$6);
glVertex3f(JPOT$2, JPOT$3, -JPOT$5);
glEnd();
/* Draw the top face of the frustum */
glBegin(GL_POLYGON);
glVertex3f(JPOT$1, JPOT$4, -JPOT$5);
glVertex3f(left_far, top_far, -JPOT$6);
glVertex3f(right_far, top_far, -JPOT$6);
glVertex3f(JPOT$2, JPOT$4, -JPOT$5);
glEnd();
/* Draw the back face of the frustum */
glBegin(GL_POLYGON);
glVertex3f(left_far, top_far, -JPOT$6);
glVertex3f(left_far, bottom_far, -JPOT$6);
glVertex3f(right_far, bottom_far, -JPOT$6);
glVertex3f(right_far, top_far, -JPOT$6);
glEnd();
/* Draw the Left Triangle */
glBegin(GL_TRIANGLES);
glVertex3f(JPOT$1, JPOT$3, -JPOT$5);
glVertex3f(0,0,0);
glVertex3f(JPOT$1, JPOT$4, -JPOT$5);
glEnd();
/* Draw the top Triangle */
glBegin(GL_TRIANGLES);
glVertex3f(JPOT$1, JPOT$4, -JPOT$5);
glVertex3f(0,0,0);
glVertex3f(JPOT$2, JPOT$4, -JPOT$5);
glEnd();
/* draw the right Triangle */
glBegin(GL_TRIANGLES);
glVertex3f(JPOT$2, JPOT$3, -JPOT$5);
glVertex3f(0,0,0);
glVertex3f(JPOT$2, JPOT$4, -JPOT$5);
glEnd();
/* draw the bottom triangle */
glBegin(GL_TRIANGLES);
glVertex3f(JPOT$1, JPOT$3, -JPOT$5);
glVertex3f(0,0,0);
glVertex3f(JPOT$2, JPOT$3, -JPOT$5);
glEnd();
glPopMatrix();
}
glFlush();
}