Faked bump map

This demo is a simplified bump map renderer. A full-featured bump mapping needs to have a coordinate system aligned with the surface, consisting of normal, tangent and bitangent (no, that should not read binormal - that applies to curves, not surfaces), where the tangent and bitangent should be aligned with the texture coordinates.

Here, I make a rough simplification instead. I don't care about aligning the tangent and bitangent with the texture coordinates, I just grab any tangent vectors at all that form a complete coordinate system.

Yes, this is cheating. For many bump maps, it is completely wrong, bumps will go inwards and outwards randomly. However, if all I need is a surface with some random bumps, it works just great. So for noise, this works just fine, while for structures with some meaning, it won't.

Updated 2017, Linux Mint. Updated 2022.


This page is maintained by Ingemar Ragnemalm.