So the first working version of the Roguestar Animation and Graphics Library is almost ready (but not in darcs yet).
One of the chief goals of RSAGL is a modeling language and model optimizer. You can see the results in this image:
This image consists of three surfaces: two spheres and one disk with a hole. The moon in the background is modeled with visibly few polygons, being small, while the nearby planet is rendered at a high detail. The ring (which is unrealistically too close to the planet) is deformed using a sine wave.
Here’s another image with the same number of total vertices but the optimizer turned off. The moon actually looks better: