first commit

web-app/node_modules/three/examples/jsm/tsl/display/Lut3DNode.js

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+import { TempNode, 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();
+
+		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 ) ) );