Hello, I’m review the source code of cube_uv_reflection_fragment.glsl. I’m confused with the cube uv reflection. The face index I got is not equal to the cubemap picture. For example, if direction is (-3, 2, 1), the result of face is 3. But according to the picture, the result of face should be 1. Does three.js have different rule of cube map to access face. I can not find any information on online docs. If anyone can give me some explanation or tips, I’ll be very gratefull. Thanks in advance.
float getFace( vec3 direction ) {
vec3 absDirection = abs( direction );
float face = - 1.0;
if ( absDirection.x > absDirection.z ) {
if ( absDirection.x > absDirection.y )
face = direction.x > 0.0 ? 0.0 : 3.0;
else
face = direction.y > 0.0 ? 1.0 : 4.0;
} else {
if ( absDirection.z > absDirection.y )
face = direction.z > 0.0 ? 2.0 : 5.0;
else
face = direction.y > 0.0 ? 1.0 : 4.0;
}
return face;
}
