`ParticleGeometryHelper` creates one particle per subgeometry. about away3d HOT 2 CLOSED

Oh, I missed that multiple ParticleData instances can have the same particleIndex, so it's all still one particle. I'll have to dig deeper.

from away3d.

The reason for this subdivision is mainly so multiple materials can be used within a single Mesh.

So the reason to preserve a particle's subgeometries is to allow you to set multiple materials later on. Interesting.

Edit:

When drawing objects, the gpu needs to be told to use a different program every time for every material. Unfortunately, this switch is typically very expensive and something you’d want to prevent as much as possible. To this end, Away3D sorts all the objects that need to be rendered (the so called “renderables”) primarily according to their materials so all objects with the same material will be rendered consecutively. If you’re using different material instances for things that look exactly the same, it means more programs need to be switched needlessly.

Maybe ParticleGeometryHelper should sort the subgeometries it creates, so Away3D doesn't have to.

from away3d.