void
cone::gl_render(view& scene)
{
if (degenerate())
return;
init_model(scene);
clear_gl_error();
// See sphere::gl_render() for a description of the level of detail calc.
double coverage = scene.pixel_coverage( pos, radius);
int lod = 0;
if (coverage < 0)
lod = 5;
else if (coverage < 10)
lod = 0;
else if (coverage < 30)
lod = 1;
else if (coverage < 90)
lod = 2;
else if (coverage < 250)
lod = 3;
else if (coverage < 450)
lod = 4;
else
lod = 5;
lod += scene.lod_adjust;
if (lod < 0)
lod = 0;
else if (lod > 5)
lod = 5;
gl_matrix_stackguard guard;
const double length = axis.mag();
model_world_transform( scene.gcf, vector( length, radius, radius ) ).gl_mult();
color.gl_set(opacity);
if (translucent()) {
gl_enable cull_face( GL_CULL_FACE);
// Render the back half.
glCullFace( GL_FRONT);
scene.cone_model[lod].gl_render();
// Render the front half.
glCullFace( GL_BACK);
scene.cone_model[lod].gl_render();
}
else {
scene.cone_model[lod].gl_render();
}
check_gl_error();
}
void
sphere::gl_render( view& geometry)
{
if (degenerate())
return;
//init_model();
init_model(geometry);
// coverage is the radius of this sphere in pixels:
double coverage = geometry.pixel_coverage( pos, radius);
int lod = 0;
if (coverage < 0) // Behind the camera, but still visible.
lod = 4;
else if (coverage < 30)
lod = 0;
else if (coverage < 100)
lod = 1;
else if (coverage < 500)
lod = 2;
else if (coverage < 5000)
lod = 3;
else
lod = 4;
lod += geometry.lod_adjust; // allow user to reduce level of detail
if (lod > 5)
lod = 5;
else if (lod < 0)
lod = 0;
gl_matrix_stackguard guard;
model_world_transform( geometry.gcf, get_scale() ).gl_mult();
color.gl_set(opacity);
if (translucent()) {
// Spheres are convex, so we don't need to sort
gl_enable cull_face( GL_CULL_FACE);
// Render the back half (inside)
glCullFace( GL_FRONT );
geometry.sphere_model[lod].gl_render();
// Render the front half (outside)
glCullFace( GL_BACK );
geometry.sphere_model[lod].gl_render();
}
else {
// Render a simple sphere.
geometry.sphere_model[lod].gl_render();
}
}