Quote - You sometimes need to have both the bump and displacement maps apply to the same point on a surface. For example, the displacement map could sculpt muscles and veins on a weight lifter, but you still want the skin bump map to add the pores and such.

I suspect that arithmetically adding the two maps together would result in a very complex mesh that would take forever to render.

Hi, maybe this helps you:

I made a material the other day that has both a bumpmap as a displacement map, used it on a brain, but you can also use the same princeple for skin and veins.

1. I made a skinmaterial with bumps
2. a vein material with displacement
3. A distributian map
   Put it all together in a mixed material