I have a simple mesh which is a cone inside another one and I want to be able to see the multiple layers but I just get the outer shell and cant see the polys under it. This works just fine in Builtin and URP but I can't get it to work at all in HDRP, I must be missing something obvious but I have been through every value and nothing makes it look correct. Anyone have any pointers as to where Iam going wrong? Below are a couple of screen shots showing the mesh from a couple of angles so you can see you cant see under the outer layer of polys. And one of the material values in case someone can spot the silly mistake Iam making.