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In the Presets menu at the top of the window, there are sampling presets for draft, production, etc. Furthermore, you can save your own sampling presets there.
IPR Samples
The IPR samples provides a separate Max Samples and Pixel Variance for IPR rendering. By default, this is set lower than render settings for quick feedback.
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- PxrDefault
- PxrDebugShadingContext
- PxrDirectLighting
- PxrOcclusion
- PxrPathTracer
- PxrVCM
- PxrValidateBxdf
- PxrVisualizer
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Image Plane Subset: Specify the trace subset for the image plane. The default value is rman__imageplane, and RfM automatically emits image planes as part of this set. The integrator will trace against this subset to get the color of the image plane. This is used for the holdout background. Note that this only applies to geometry that is assigned an emissive Bxdf such as PxrConstant.
Default Ray Depths
Max Specular Depth: Number of bounces for reflections and refractions. A value of 1 or 2 is sufficient unless you need multi bounce effects or have panes of glass or windows. This attribute can be overridden on individual objects.
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