three
Version:
JavaScript 3D library
28 lines (15 loc) • 592 B
JavaScript
import TempNode from '../core/TempNode.js';
import { nodeObject, vec2, add, mul, atan2, asin, clamp, positionWorldDirection } from '../shadernode/ShaderNodeElements.js';
class EquirectUVNode extends TempNode {
constructor( dirNode = positionWorldDirection ) {
super( 'vec2' );
this.dirNode = dirNode;
}
construct() {
const dir = nodeObject( this.dirNode );
const u = add( mul( atan2( dir.z, dir.x ), 1 / ( Math.PI * 2 ) ), 0.5 );
const v = add( mul( asin( clamp( dir.y, - 1.0, 1.0 ) ), 1 / Math.PI ), 0.5 );
return vec2( u, v );
}
}
export default EquirectUVNode;