Quantizing tangent frames (opens in new tab)

I’ve been working on tangent space generation recently, and also pondering the tradeoffs between QTangent and normal-angle storage. So when, in a completely unrelated discussion, someone said “you could store tangent and normal as two RGB10A2 attributes”, I decided I should measure this once and for all and write it up. This is going to be a quick post that doesn’t intend to do any original research. Instead it aggregates the research that other people have done, and examines different repres...