Specular Occlusion Mode The mode that HDRP uses to calculate specular occlusion. The options are:
• Off: Disables specular occlusion.
• From AO: Calculates specular occlusion from the ambient occlusion map and the Camera's view vector.
• From AO and Bent Normal: Calculates specular occlusion from the ambient occlusion map, the bent normal map, and the Camera's view vector. If no bent normal is provided, the normal is used instead.
• Custom: Allows you to specify your own specular occlusion values.