Blender Git Loki

Use an object pointer from the evaluation data, rather than storing just indices.

Pointer type for passing opaque DNA references and the like through the VM.

Moved the conversion of bNodeTree (DNA/pynodes) to python code for simplicity.

This has several advantages over doing the same in C/C++ code:

- The two parts of the code are clearly separate (parsing DNA settings vs. building and evaluating)
- UI constructs with modes, special cases, etc. can be done in py, heavy lifting still happens in C
- Scripters can easily add own nodes without having to deal with internals

Added first procedural texture node (voronoi).

Texture coordinates node.

Invalidate the texture bvm program cache when the Tex datablock is updated.

Start of a texture node replacement using the bvm system.

Staged construction of node graphs from bNodeTrees through a "parser".

This wraps mapping of sockets and links in a nice small API.

Added a float4 type for rgba colors mostly.

Internal support for 4x4 matrices in the bvm types.

Renamed 'effector' data to 'point' data.

More vector math node modes.

Effector closest-point node for mesh-based for fields.

Merge branch 'master' into object_nodes

Added globals as a distinct argument to the eval function.

Support for constants as internal node socket inputs.

Constants should never be linked to other nodes (will be ignored).

Added an integer type for node sockets.

Cleanup: removed unused test code.

Fix for multiplicity of internal socket mapping.

A Blender bNode input socket can represent multiple internal node inputs,
so mapping for links must use a set rather than a single socket.

First input node: getting basic properties of the "effected" point.