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By default, RenderMan for Blender will use PxrPathTracer as the integrator for the scene. To set/use a different integrator, go to the render properties 
and click Add RenderMan Integrator Nodetree.
You should then see something like this:
...
...
By default, RenderMan for Blender will use PxrPathTracer as the integrator for the scene. To set/use a different integrator, go to the render properties and click Add RenderMan Integrator Nodetree.
You should then see something like this:
...