BlenderPython
The BlenderPython example recipe uses a parent scene generated procedurally via the Blender-Python API and a custom python module for RenderToolbox3 Python module.
Above, Mitsuba rendered the scene.
The parent scene itself is called "CheckerShadow", and models a checkerboard and a cylinder, which casts a shadow on the checkerboard.
See BlenderPython Example Scene for more about this particular scene. See Python-driven-Blender for more about modeling with Blender and Python in general.
The executive script MakeCheckerShadowScene.m produced the image above. It is located at here:
(path-to-RenderToolbox3)/ExampleScenes/BlenderPython/MakeCheckerShadowScene.m