pbr.frag DEBUG_NORMAL output's the normal map, or a a static value.

[slicer4ever]

right now

glTF-Sample-Viewer/src/shaders/pbr.frag

Line 676 in 18a5d71

#ifdef DEBUG_NORMAL

either outputs the normal map value, or outputs a static value instead of n's actual value.

I'd suggest splitting this into DEBUG_NORMAL and DEBUG_NORMALMAP where the latter will output the normal map value for the fragment, and DEBUG_NORMAL will output the actual transformed normal value.

[UX3D-nopper]

The normal needs to by transformed back to tangent-space to be compliant with the normal map.
Or we render the object-space normal. Hmm, but the world-normal could be interesting as well.

[slicer4ever]

I cloned the repo and made it output the world-normals, As i'm trying to debug why my IBL code seems to be producing different results, I was trying to compare all the inputs to figure out my mistake and noticed this when going over the viewer's shader code. I think having world-normals as a debug option would help anyone in a similar situation as mine that wants to make sure their model's normal's are being transformed correctly.