Baking out textures involves two easy steps.

See Baking for more information.

The user should supply UVs (UV mapped) for the object to be baked.

Set Bake Hider

Instead of using raytrace, set it to bake.

 

Add PxrBakeTexture

In your RIS Network, add a PxrBakeTexture VOP.  Wire its output to a PxrSurface color parameter so it will get evaluated.

In the PxrBakeTexture VOP, set its output FileName.  See PxrBakeTexture for descriptions of each parameter.