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Setting up Display and Sample Filters

In your camera OBJ, using Edit Parameter Interface, add a shop_outputpath to your camera's Render TAB. Label it "Display Filter". 

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If you want the camera to output a sample filter instead of display filter, add another parameter:  ri_usesamplefilter.  Label it "Use Sample Filter".

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Inside your RIS Network, pick a Pxr display Display or sample filter Sample Filter VOP.

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Drag the VOP path to the Display Filter or Sample Filter parameter .

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If it is a sample filter, turn on "Use Sample Filter"

in your render ROP.

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Using Multiple Display or Sample Filters

For multiple display filters, in your RIS Network, create a PxrDisplayFilterCombiner VOP.

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For multiple sample filters, in your RIS Network, create a PxrSampleFilterCombiner VOP.

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In the combiner, hit the + icon to dynamically create a display/sample filter.  Use the x icon to remove it.

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Drag the path of the combiner VOP to the Display Filter or Sample Filter parameter .Image Removedin your render ROP, as above.