var quat = Quaternion.LookRotation(normal, tangentXYZ);// rotationMatrix.rotation.normalized;
                if (quat.w < 0) quat = new Quaternion(-quat.x, -quat.y, -quat.z, -quat.w);
                float bias = 1.0f/32767;
                if (quat.w < bias)
                {
                    float nfactor = Mathf.Sqrt(1.0f - bias*bias);
                    quat = new Quaternion(quat.x*nfactor, quat.y*nfactor, quat.z*nfactor, bias);
                }
                var testBinormal = Vector3.Cross(normal, tangentXYZ).normalized;
                if (Vector3.Dot(binormalOrig, testBinormal) <= 0) quat = new Quaternion(-quat.x, -quat.y, -quat.z, -quat.w);

localNormal = QuatRotate(IN.Normal.xyzw, float3(0,0,1));

    IN.Tangent.xyz =  QuatRotate(IN.Normal.xyzw, float3(0,1,0));
    OUT.Tangent = normalize(mul((float3x3)vWorldMatrix, IN.Tangent.xyz));

    float sign = IN.Normal.w > 0 ? 1 : -1;
    OUT.Binormal = (cross(vNormalW, OUT.Tangent) * sign);