Kévin Dietrich
6883c47bb5
There are two issues revealed in the bug report: - the GPU subdivision does not support meshes with only loose geometry - the loose geometry is not subdivided For the first case, checks are added to ensure we still fill the buffers with loose geometry even if no polygons are present. For the second case, this adds `BKE_subdiv_mesh_interpolate_position_on_edge` which encapsulates the loose vertex interpolation mechanism previously found in `subdiv_mesh_vertex_of_loose_edge`. The subdivided loose geometry is stored in a new specific data structure `DRWSubdivLooseGeom` so as to not pollute `MeshExtractLooseGeom`. These structures store the corresponding coarse element data, which will be used for filling GPU buffers appropriately. Differential Revision: https://developer.blender.org/D14171