Accueil / npm / three@0.171.0 / examples / jsm / tsl / display / Lut3DNode.js
Lut3DNode.js
import { TempNode } from 'three/webgpu';
import { nodeObject, Fn, float, uniform, vec3, vec4, mix } from 'three/tsl';
class Lut3DNode extends TempNode {
static get type() {
return 'Lut3DNode';
}
constructor( inputNode, lutNode, size, intensityNode ) {
super( 'vec4' );
this.inputNode = inputNode;
this.lutNode = lutNode;
this.size = uniform( size );
this.intensityNode = intensityNode;
}
setup() {
const { inputNode, lutNode } = this;
const sampleLut = ( uv ) => lutNode.uv( uv );
const lut3D = Fn( () => {
const base = inputNode;
// pull the sample in by half a pixel so the sample begins at the center of the edge pixels.
const pixelWidth = float( 1.0 ).div( this.size );
const halfPixelWidth = float( 0.5 ).div( this.size );
const uvw = vec3( halfPixelWidth ).add( base.rgb.mul( float( 1.0 ).sub( pixelWidth ) ) );
const lutValue = vec4( sampleLut( uvw ).rgb, base.a );
return vec4( mix( base, lutValue, this.intensityNode ) );
} );
const outputNode = lut3D();
return outputNode;
}
}
export default Lut3DNode;
export const lut3D = ( node, lut, size, intensity ) => nodeObject( new Lut3DNode( nodeObject( node ), nodeObject( lut ), size, nodeObject( intensity ) ) );