void Frustum::ExtractFromOGLState() {
Matrix44f modelview;
Matrix44f projection;
glGetFloatv(GL_MODELVIEW_MATRIX, modelview.get_ptr());
glGetFloatv(GL_PROJECTION_MATRIX, projection.get_ptr());
Extract(projection * modelview);
}
void DrawRaytraceVolume() {
glLoadIdentity();
Matrix44f modelview;
m_camera.GetMatrix(&modelview);
Matrix44f projection;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, Projection::AspectRatio(width(), height()), 0.1, 100.0f);
glGetFloatv(GL_PROJECTION_MATRIX, projection.get_ptr());
glMatrixMode(GL_MODELVIEW);
#if 0
Projection proj(45.0f, Projection::AspectRatio(width(), height()), 0.1f,
100.0f);
proj.GetMatrix(&projection);
#endif
m_rt_vol_renderer.set_light_pos(m_sphere_pos);
m_rt_vol_renderer.Render(modelview, projection);
}