Wow, that went a lot faster than I expected. I finished all of the tasks I laid myself in the last post, and so VectorStorm can now lay down areas of color by using a combination of a VertexArray command to specify vertices, and a TriangleStrip or TriangleFan command, specifying the order in which to use the vertices.
In this case, I’m using a TriangleFan to fill the asteroid, and a LineStrip to outline it. And it looks even better than I’d been hoping. I feel reassured that this isn’t going contrary to the “vector graphic” aesthetic; it’s just taking the overall look further along in the same direction it was already going.