INNER CODE UNIT · Python
duv1
jakubtomsu/dungeon-of-quake · iqm_export_bl293.py:139
duv1 = v1.uv - v0.uv
duv2 = v2.uv - v0.uv
tangent = dco2*duv1.y - dco1*duv2.y
bitangent = dco2*duv1.x - dco1*duv2.x
if dco2.cross(dco1).dot(bitangent.cross(tangent)) < 0:
tangent.negate()
bitangent.negate()
v0.tangent += tangent
v1.tangent += tangent
v2.tangent += tangent
v0.bitangent += bitangent
v1.bitangent += bitangent
v2.bitangent += bitangent
for v in self.verts:
v.tangent = v.tangent - v.normal*v.tangent.dot(v.normal)
v.tangent.normalize()
if v.normal.cross(v.tangent).dot(v.bitangent) < 0:
v.bitangent = -1.0