Visual map doesn't work with DXT5 normal maps (e.g. parallax continued)

[JonnyOThan]

Linx — 12:18 PM
Not 100% sure if the normal map is reinterpreted by Unity at this point, but it could be because my normals are DXT5_NM and KSP's aren't
My normals don't store the tangent Z so it's always 1
JonnyOThan — 12:19 PM
does it change how the channels.....right
yeah that'll do it I think
Linx — 12:19 PM
Yeah it does. Unity handles the conversion under the hood but I don't know if that's specifically for the GPU side or if it gets reprocessed before being packed into the Texture2D
JonnyOThan — 12:20 PM
the scansat code seems to be looking at the .z component to get a slope value for fake lighting
Linx — 12:21 PM
If you wanted to reproduce it, try

Vector3 sample = new Vector3(nrm.g, nrm.a, 1) * 2 - 1;
float reconstructedZ = sqrt(1.0 - saturate(dot(sample.rg, sample.rg)));
nrm = normalize(sample.r, sample.g, reconstructedZ);
pseudocode ofc