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