Animator renormalizes quantized weights;
It would be nice to do this in the importer, but it was 50+ lines and
was really tricky to write without reading from uncached GPU-mapped
memory.  Instead, it's 1 line here.
I hope zero-weight vertices aren't a thing?
@@ -39,6 +39,9 @@ void lovrmain() {
uint i3 = (indices >> 24) & 0xff;
vec4 weights = unpackUnorm4x8(skin[vertexIndex].weights);
+ // Model loader does not currently renormalize weights post-quantization
+ weights /= weights[0] + weights[1] + weights[2] + weights[3];
+
mat4 matrix = mat4(0);
matrix += joints[i0] * weights[0];
matrix += joints[i1] * weights[1];
