Brecht Van Lommel
ca9d65cc97
Instancing with geometry nodes uses just the evaluated Mesh, and ignores the Object that it came from. That meant that it would try to look up the subsurf modifier on the instancer object which does not have the subsurf modifier. Instead of storing a session UUID and looking up the modifier data, store a point to the subsurf modifier runtime data. Unlike the modifier data, this runtime data is preserved across depsgraph CoW. It must be for the subdiv descriptor contained in it to stay valid along with the draw cache. As a bonus, this moves various Mesh_Runtime variables into the subsurf runtime data, reducing memory usage for meshes not using subdivision surfaces. Also fixes T98693, issues with subdivision level >= 8 due to integer overflow. Differential Revision: https://developer.blender.org/D15184