public void Populate(TiltBrush.GeometryPool pool)
{
pool.EnsureGeometryResident();
if (primitives.Count > 0)
{
// Vertex data is shared among all the primitives in the mesh, so only do [0]
primitives[0].attributes.Populate(pool);
primitives[0].Populate(pool);
// I guess someone might want to map Unity submeshes -> gltf primitives.
// - First you'd want to make sure that consuming tools won't freak out about that,
// since it doesn't seem to be the intended use for the mesh/primitive distinction.
// See https://github.com/KhronosGroup/glTF/issues/1278
// - Then you'd want Populate() to take multiple GeometryPools, one per MeshSubset.
// - Then you'd want those GeometryPools to indicate somehow whether their underlying
// vertex data is or can be shared -- maybe do this in GeometryPool.FromMesh()
// by having them point to the same Lists.
// - Then you'd want to make GlTF_attributes.Populate() smart enough to understand that
// sharing (ie, memoizing on the List<Vector3> pointer)
// None of that is implemented, which is okay since our current gltf generation
// code doesn't add more than one GlTF_Primitive per GlTF_Mesh.
if (primitives.Count > 1)
{
Debug.LogError("More than one primitive per mesh is unimplemented and unsupported");
}
}
// The mesh data is only ever needed once (because it only goes into the .bin
// file once), but ExportMeshGeomPool still uses bits of data like pool.NumTris
// so we can't destroy it.
//
// We could MakeNotResident(filename) again, but that's wasteful and I'd need to
// add an API to get the cache filename. So this "no coming back" API seems like
// the most expedient solution.
// TODO: replace this hack with something better? eg, a way to reload from
// file without destroying the file?
// pool.Destroy();
pool.MakeGeometryPermanentlyNotResident();
}
