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ClippingNode.js
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import Node from '../core/Node.js';
import { nodeObject, Fn, bool, float } from '../tsl/TSLBase.js';
import { positionView } from './Position.js';
import { diffuseColor } from '../core/PropertyNode.js';
import { Loop } from '../utils/LoopNode.js';
import { smoothstep } from '../math/MathNode.js';
import { uniformArray } from './UniformArrayNode.js';
class ClippingNode extends Node {
static get type() {
return 'ClippingNode';
}
constructor( scope = ClippingNode.DEFAULT ) {
super();
this.scope = scope;
}
setup( builder ) {
super.setup( builder );
const clippingContext = builder.clippingContext;
const { intersectionPlanes, unionPlanes } = clippingContext;
if ( this.scope === ClippingNode.ALPHA_TO_COVERAGE ) {
return this.setupAlphaToCoverage( intersectionPlanes, unionPlanes );
} else {
return this.setupDefault( intersectionPlanes, unionPlanes );
}
}
setupAlphaToCoverage( intersectionPlanes, unionPlanes ) {
return Fn( () => {
const distanceToPlane = float().toVar( 'distanceToPlane' );
const distanceGradient = float().toVar( 'distanceToGradient' );
const clipOpacity = float( 1 ).toVar( 'clipOpacity' );
const numUnionPlanes = unionPlanes.length;
if ( numUnionPlanes > 0 ) {
const clippingPlanes = uniformArray( unionPlanes );
let plane;
Loop( numUnionPlanes, ( { i } ) => {
plane = clippingPlanes.element( i );
distanceToPlane.assign( positionView.dot( plane.xyz ).negate().add( plane.w ) );
distanceGradient.assign( distanceToPlane.fwidth().div( 2.0 ) );
clipOpacity.mulAssign( smoothstep( distanceGradient.negate(), distanceGradient, distanceToPlane ) );
} );
}
const numIntersectionPlanes = intersectionPlanes.length;
if ( numIntersectionPlanes > 0 ) {
const clippingPlanes = uniformArray( intersectionPlanes );
const intersectionClipOpacity = float( 1 ).toVar( 'intersectionClipOpacity' );
let plane;
Loop( numIntersectionPlanes, ( { i } ) => {
plane = clippingPlanes.element( i );
distanceToPlane.assign( positionView.dot( plane.xyz ).negate().add( plane.w ) );
distanceGradient.assign( distanceToPlane.fwidth().div( 2.0 ) );
intersectionClipOpacity.mulAssign( smoothstep( distanceGradient.negate(), distanceGradient, distanceToPlane ).oneMinus() );
} );
clipOpacity.mulAssign( intersectionClipOpacity.oneMinus() );
}
diffuseColor.a.mulAssign( clipOpacity );
diffuseColor.a.equal( 0.0 ).discard();
} )();
}
setupDefault( intersectionPlanes, unionPlanes ) {
return Fn( () => {
const numUnionPlanes = unionPlanes.length;
if ( numUnionPlanes > 0 ) {
const clippingPlanes = uniformArray( unionPlanes );
let plane;
Loop( numUnionPlanes, ( { i } ) => {
plane = clippingPlanes.element( i );
positionView.dot( plane.xyz ).greaterThan( plane.w ).discard();
} );
}
const numIntersectionPlanes = intersectionPlanes.length;
if ( numIntersectionPlanes > 0 ) {
const clippingPlanes = uniformArray( intersectionPlanes );
const clipped = bool( true ).toVar( 'clipped' );
let plane;
Loop( numIntersectionPlanes, ( { i } ) => {
plane = clippingPlanes.element( i );
clipped.assign( positionView.dot( plane.xyz ).greaterThan( plane.w ).and( clipped ) );
} );
clipped.discard();
}
} )();
}
}
ClippingNode.ALPHA_TO_COVERAGE = 'alphaToCoverage';
ClippingNode.DEFAULT = 'default';
export default ClippingNode;
export const clipping = () => nodeObject( new ClippingNode() );
export const clippingAlpha = () => nodeObject( new ClippingNode( ClippingNode.ALPHA_TO_COVERAGE ) );