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On the Beautiful, Briny...
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For the layer mask, we can use the outEigenvalueFloat output from the aaOceanPrmanShader pattern pattern. It's necessary that the values fall into the 0-1 range. We can easily enforce that by using a PxrRemap node. Connect the PxrRemap to the layer mask parameter. Because PxrRemap only works with colors, we can use a PxrToFloat3 to convert the outEigenvalueFloat to a triplet. Set the Input Min and Input Max to -5 and 5, respectively, on the PxrRemap node.
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