Spawn By Texture Implemented

The spawning feature of the crowd has been improved!  It began as a simple Maya emitter, so any extra work would have to be done outside of the tool, but now texture emission can be chosen within the Emitter node and will accept the texture file using the gray scale map.

The downfall here is that this relies on a terrain UV's so this can only work with a single object easily.  The next implementation will be geometry based as this provide more flexibility at the cost of a more complex simulation