first commit

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

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+import { TempNode, nodeObject, Fn, float, uv, convertToTexture, vec4, If, int, clamp, sub, mix } from 'three/tsl';
+
+class TransitionNode extends TempNode {
+
+	static get type() {
+
+		return 'TransitionNode';
+
+	}
+
+	constructor( textureNodeA, textureNodeB, mixTextureNode, mixRatioNode, thresholdNode, useTextureNode ) {
+
+		super();
+
+		// Input textures
+
+		this.textureNodeA = textureNodeA;
+		this.textureNodeB = textureNodeB;
+		this.mixTextureNode = mixTextureNode;
+
+		// Uniforms
+
+		this.mixRatioNode = mixRatioNode;
+		this.thresholdNode = thresholdNode;
+		this.useTextureNode = useTextureNode;
+
+	}
+
+	setup() {
+
+		const { textureNodeA, textureNodeB, mixTextureNode, mixRatioNode, thresholdNode, useTextureNode } = this;
+
+		const sampleTexture = ( textureNode ) => {
+
+			const uvNodeTexture = textureNode.uvNode || uv();
+			return textureNode.uv( uvNodeTexture );
+
+		};
+
+		const transition = Fn( () => {
+
+			const texelOne = sampleTexture( textureNodeA );
+			const texelTwo = sampleTexture( textureNodeB );
+
+			const color = vec4().toVar();
+
+			If( useTextureNode.equal( int( 1 ) ), () => {
+
+				const transitionTexel = sampleTexture( mixTextureNode );
+				const r = mixRatioNode.mul( thresholdNode.mul( 2.0 ).add( 1.0 ) ).sub( thresholdNode );
+				const mixf = clamp( sub( transitionTexel.r, r ).mul( float( 1.0 ).div( thresholdNode ) ), 0.0, 1.0 );
+
+				color.assign( mix( texelOne, texelTwo, mixf ) );
+
+			} ).Else( () => {
+
+				color.assign( mix( texelTwo, texelOne, mixRatioNode ) );
+
+			} );
+
+			return color;
+
+		} );
+
+		const outputNode = transition();
+
+		return outputNode;
+
+	}
+
+}
+
+export default TransitionNode;
+
+export const transition = ( nodeA, nodeB, mixTexture, mixRatio = 0.0, threshold = 0.1, useTexture = 0 ) => nodeObject( new TransitionNode( convertToTexture( nodeA ), convertToTexture( nodeB ), convertToTexture( mixTexture ), nodeObject( mixRatio ), nodeObject( threshold ), nodeObject( useTexture ) ) );