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public/sdk/three/jsm/nodes/utils/TriplanarTexturesNode.js

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+import Node, { addNodeClass } from '../core/Node.js';
+import { add } from '../math/OperatorNode.js';
+import { normalLocal } from '../accessors/NormalNode.js';
+import { positionLocal } from '../accessors/PositionNode.js';
+import { texture } from '../accessors/TextureNode.js';
+import { addNodeElement, nodeProxy, float, vec3 } from '../shadernode/ShaderNode.js';
+
+class TriplanarTexturesNode extends Node {
+
+	constructor( textureXNode, textureYNode = null, textureZNode = null, scaleNode = float( 1 ), positionNode = positionLocal, normalNode = normalLocal ) {
+
+		super( 'vec4' );
+
+		this.textureXNode = textureXNode;
+		this.textureYNode = textureYNode;
+		this.textureZNode = textureZNode;
+
+		this.scaleNode = scaleNode;
+
+		this.positionNode = positionNode;
+		this.normalNode = normalNode;
+
+	}
+
+	setup() {
+
+		const { textureXNode, textureYNode, textureZNode, scaleNode, positionNode, normalNode } = this;
+
+		// Ref: https://github.com/keijiro/StandardTriplanar
+
+		// Blending factor of triplanar mapping
+		let bf = normalNode.abs().normalize();
+		bf = bf.div( bf.dot( vec3( 1.0 ) ) );
+
+		// Triplanar mapping
+		const tx = positionNode.yz.mul( scaleNode );
+		const ty = positionNode.zx.mul( scaleNode );
+		const tz = positionNode.xy.mul( scaleNode );
+
+		// Base color
+		const textureX = textureXNode.value;
+		const textureY = textureYNode !== null ? textureYNode.value : textureX;
+		const textureZ = textureZNode !== null ? textureZNode.value : textureX;
+
+		const cx = texture( textureX, tx ).mul( bf.x );
+		const cy = texture( textureY, ty ).mul( bf.y );
+		const cz = texture( textureZ, tz ).mul( bf.z );
+
+		return add( cx, cy, cz );
+
+	}
+
+}
+
+export default TriplanarTexturesNode;
+
+export const triplanarTextures = nodeProxy( TriplanarTexturesNode );
+export const triplanarTexture = ( ...params ) => triplanarTextures( ...params );
+
+addNodeElement( 'triplanarTexture', triplanarTexture );
+
+addNodeClass( 'TriplanarTexturesNode', TriplanarTexturesNode );