blendtorch v0.4

• upgraded to Blender 2.91
• added compositor-rendering support for accessing different render passes. See examples.
• moved gamma correction from renderers to btb namespace
• added functional materials for rendering camera-space normals
• fixed unit tests failing for control tests

blendtorch v0.3

Added

• bi-directional communcation between Blender and PyTorch
• new example densityopt

blendtorch v0.2

• Support for training RL agents in OpenAI environments defined in Blender. See examples/control for details.
• Support for dataset transformations when num_workers > 0.
• Support for message recording when num_workers > 0.
• Made blendtorch.btb and blendtorch.btt installable packages. See Readme.md for details.
• Remote data streaming now uses PyTorch IterableDataset and
  hence simplifies the interface. See examples/datagen for details.
• Added unit tests and CI.

blendtorch v0.1

Added Blender 2.8 support