Accueil / npm / three@0.171.0 / src / nodes / functions / material / getParallaxCorrectNormal.js
getParallaxCorrectNormal.js
import { positionWorld } from '../../accessors/Position.js';
import { float, Fn, min, normalize, sub, vec3 } from '../../tsl/TSLBase.js';
// https://devlog-martinsh.blogspot.com/2011/09/box-projected-cube-environment-mapping.html
const getParallaxCorrectNormal = /*@__PURE__*/ Fn( ( [ normal, cubeSize, cubePos ] ) => {
const nDir = normalize( normal ).toVar( 'nDir' );
const rbmax = sub( float( 0.5 ).mul( cubeSize.sub( cubePos ) ), positionWorld ).div( nDir ).toVar( 'rbmax' );
const rbmin = sub( float( - 0.5 ).mul( cubeSize.sub( cubePos ) ), positionWorld ).div( nDir ).toVar( 'rbmin' );
const rbminmax = vec3().toVar( 'rbminmax' );
rbminmax.x = nDir.x.greaterThan( float( 0 ) ).select( rbmax.x, rbmin.x );
rbminmax.y = nDir.y.greaterThan( float( 0 ) ).select( rbmax.y, rbmin.y );
rbminmax.z = nDir.z.greaterThan( float( 0 ) ).select( rbmax.z, rbmin.z );
const correction = min( min( rbminmax.x, rbminmax.y ), rbminmax.z ).toVar( 'correction' );
const boxIntersection = positionWorld.add( nDir.mul( correction ) ).toVar( 'boxIntersection' );
return boxIntersection.sub( cubePos );
} );
export default getParallaxCorrectNormal;