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"""
Base class for integrating USD Hydra based renderers.
USD Hydra Based Renderer
++++++++++++++++++++++++
"""
import bpy
class CustomHydraRenderEngine(bpy.types.HydraRenderEngine):
# Identifier and name in the user interface.
bl_idname = "CUSTOM_HYDRA_RENDERER"
bl_label = "Custom Hydra Renderer"
# Name of the render plugin.
bl_delegate_id = "HdCustomRendererPlugin"
# Use MaterialX instead of `UsdPreviewSurface` for materials.
bl_use_materialx = True
# Register path to plugin.
@classmethod
def register(cls):
# Make `pxr` module available, for running as `bpy` PIP package.
bpy.utils.expose_bundled_modules()
import pxr.Plug
pxr.Plug.Registry().RegisterPlugins(['/path/to/plugin'])
# Render settings that will be passed to the delegate.
def get_render_settings(self, engine_type):
return {
'myBoolean': True,
'myValue': 8,
'aovToken:Depth': "depth",
}
# RenderEngine methods for update, render and draw are implemented in
# HydraRenderEngine. Optionally extra work can be done before or after
# by implementing the methods like this.
def update(self, data, depsgraph):
super().update(data, depsgraph)
# Do extra work here.
def update_render_passes(self, scene, render_layer):
if render_layer.use_pass_z:
self.register_pass(scene, render_layer, 'Depth', 1, 'Z', 'VALUE')
# Registration.
def register():
bpy.utils.register_class(CustomHydraRenderEngine)
def unregister():
bpy.utils.unregister_class(CustomHydraRenderEngine)
if __name__ == "__main__":
register()
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