Blender Git Loki

Attributes for subdivision

Enable displacement for geometry cache

Approximate normals for "true" displacement

Add bvh for subpatches

Adding a geometry cache

Squashed the following 7 commits:

- Add geometry cache ; geom cache

- Add geometry cache ; geom

- Add geometry cache ; bvh

- Add geometry cache ; mesh

- Add geometry cache ; sync

- Add geometry cache ; subd

- Add geometry cache ; geom bvh

Add max subdivision setting to subdivision meshes

Seperate dice and split for subdivision meshes

Add displacement scale option to displaced meshes

Add basic OpenSubDiv support

Fix support for triangles in DiagSplit implementation

Change use subdivision bool to subdivision type enum

Set normals properly for subdivision meshes

Change Cycles displacement UI to split column

Have dicing happen in screen space

Migrate away from ccl::SubdMesh for tessellation

Add preview dice rate for displacement

Approximate normals for "true" displacement

Attributes for subdivision

Enable displacement for geometry cache

Add geometry cache ; geom bvh