Ok I was playing a bit with the maps and I discovered this : The parallax seems to be a image reflected and seen trhouth the surface of the mesh the alpha in the diffuse setting of the texture base seem seems to allow more or less transparency to the first diffuse layer , the subsurface3 I am not actually sure what it does…
Maybe try some simple tests. Use a simple pattern for the diffuse, flat normals, and test the other maps one by one. Then you can get a better idea of what does what more easily, though there's sure to be interaction between them. Which map did you add the red stripes to?
I'm gonna guess the parralax is a secondary layer 'behind' a translucent front layer. it simulates the rocks behind the thin layer of ice. Subsurface can be colored, just like specular maps can be. The alpha map is used in combination with the specular/normal/diffuse to simulate the 'front' layer I mentioned above. Does…
Here's what I found: And I'm using a flat normal and nearly black specular. This particular model isn't set to use an external parallax map, only the diffuse alpha, so it might be different from the glacier. The valleys move with the camera, creating a sense of depth. I made more variations since this screenshot, but the…