// A couple thoughts on sphere drawing:
// 1) You need more slices than stacks, but little less than 2:1
// 2) At low LOD, setting stacks to an odd number avoids a "band" around the equator, making things look smoother
void LLRenderSphere::prerender()
{
// Create a series of display lists for different LODs
mDList[0] = glGenLists(1);
glNewList(mDList[0], GL_COMPILE);
drawSolidSphere(1.0, 30, 20);
glEndList();
mDList[1] = glGenLists(1);
glNewList(mDList[1], GL_COMPILE);
drawSolidSphere(1.0, 20, 15);
glEndList();
mDList[2] = glGenLists(1);
glNewList(mDList[2], GL_COMPILE);
drawSolidSphere(1.0, 12, 8);
glEndList();
mDList[3] = glGenLists(1);
glNewList(mDList[3], GL_COMPILE);
drawSolidSphere(1.0, 8, 5);
glEndList();
}
/* ---------------------------------------------------------- */
static void redraw(void)
{
GLfloat colorwhite [] = {1.0f, 1.0f, 1.0f, 1.0f};
GLfloat light_position[4]={cos(M_PI/4)*(distance+1),0.0,sin(M_PI/4)*(distance+1),1};
glClearColor(0,0.4f,1,1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(
cos(M_PI/4)*(distance+1),0.0,sin(M_PI/4)*(distance+1),
0.0,0.0,0.9,
0.0,0.0,1.0);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, 1);
glLightfv(GL_LIGHT0, GL_DIFFUSE, colorwhite );
glEnable (GL_LIGHT0);
glEnable(GL_LIGHTING);
glPushMatrix();
glDisable(GL_LIGHTING);
glBegin(GL_LINES);
glColor3f(1,0,0);glVertex3f(0,0,0);glVertex3f(2,0,0);
glColor3f(0,1,0);glVertex3f(0,0,0);glVertex3f(0,2,0);
glColor3f(0,0,1);glVertex3f(0,0,0);glVertex3f(0,0,2);
glEnd();
glRotatef(angley,0,1,0);
glBindTexture(GL_TEXTURE_2D,textures[curtexture]);
glEnable(GL_TEXTURE_2D);
glColor3f(1,1,1);
glEnable(GL_LIGHTING);
glEnable( GL_POLYGON_OFFSET_FILL );
glPolygonOffset(1,1);
drawSolidSphere(1,64,64);
glDisable(GL_TEXTURE_2D);
glDisable( GL_POLYGON_OFFSET_FILL );
glPopMatrix();
glutSwapBuffers();
}
