Rasagar/Library/PackageCache/com.unity.render-pipelines.high-definition/Documentation~/snippets/shader-properties/autodesk-interactive/use-opacity-map-masked.md

UseOpacityMap Toggles whether the material uses the alpha channel of the ColorMap texture or the red channel of the MaskMap texture to set the opacity of its surface. Enable this checkbox to use the alpha channel of the ColorMap texture, disable this checkbox to use the red channel of the MaskMap texture.