three
Version:
JavaScript 3D library
49 lines (27 loc) • 983 B
JavaScript
export default /* glsl */`
float faceDirection = gl_FrontFacing ? 1.0 : - 1.0;
// Workaround for Adreno GPUs not able to do dFdx( vViewPosition )
vec3 fdx = vec3( dFdx( vViewPosition.x ), dFdx( vViewPosition.y ), dFdx( vViewPosition.z ) );
vec3 fdy = vec3( dFdy( vViewPosition.x ), dFdy( vViewPosition.y ), dFdy( vViewPosition.z ) );
vec3 normal = normalize( cross( fdx, fdy ) );
vec3 normal = normalize( vNormal );
normal = normal * faceDirection;
vec3 tangent = normalize( vTangent );
vec3 bitangent = normalize( vBitangent );
tangent = tangent * faceDirection;
bitangent = bitangent * faceDirection;
mat3 vTBN = mat3( tangent, bitangent, normal );
// non perturbed normal for clearcoat among others
vec3 geometryNormal = normal;
`;