Blender Git Loki

Initial OpenSubdiv support

Catmull-Clark subdivision option is now functional. Creases and uv subdivision
will be implemented later.

Move Mesh::tessellate to mesh_subdivision.cpp

Adding OpenSubdiv support will require a lot of code, to keep things organized
subdivision related things are being moved to their own file.

Add OpenSubdiv build options for Cycles

This adds a WITH_CYCLES_OPENSUBDIV build option which will enable Catmull-Clark
subdivision meshes via OpenSubdiv. This option will be turned on automatically
if WITH_OPENSUBDIV has been turned on. Right now this option doesn't
actually do anything.

cleanup liquid inflow functions

Merge branch 'master' into temp-cycles-microdisplacement

Brought back traditional blur, renamed new blur to average, and added an average mode.

Cycles: Add the two new headers to CMake

Properly ref-count CacheFile block usage, add a function to copy the
block.

Apply time offset to names of files in a sequence.

Merge branch 'master' into alembic_basic_io

Commented out some old code which made the average brush slow. Created a vert to poly map for the blur brush.

Support animation of CacheFile properties.

Ensure split quads line up with split ngons

Improved splitting

Split subpatches such that the ratio of T for opposite edges doesn't
exceed 1.5, this reduces over tessellation for some patches

Remove subd_mesh.cpp and subd_mesh.h

Old code that's not needed anymore

Remove triangles from DiagSplit implementation

Not needed now that we have ngons

Disable curves on subdivision meshes for now

Attributes on curves seems broken even without subdivision, but is even
worse with. Will investigate re-enabling later.

Split vertex normals on ngons

Keep size of vert_patch_uv in sync to avoid triggering assert

Sync ngons and attributes from Blender to Cycles