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import Node from '../core/Node.js';
import { float, vec3, add, mul, div, dot, normalize, abs, texture, positionWorld, normalWorld } from '../shadernode/ShaderNodeBaseElements.js';
class TriplanarTexturesNode extends Node {
constructor( textureXNode, textureYNode = null, textureZNode = null, scaleNode = float( 1 ), positionNode = positionWorld, normalNode = normalWorld ) {
super( 'vec4' );
this.textureXNode = textureXNode;
this.textureYNode = textureYNode;
this.textureZNode = textureZNode;
this.scaleNode = scaleNode;
this.positionNode = positionNode;
this.normalNode = normalNode;
}
construct() {
const { textureXNode, textureYNode, textureZNode, scaleNode, positionNode, normalNode } = this;
// Ref: https://github.com/keijiro/StandardTriplanar
// Blending factor of triplanar mapping
let bf = normalize( abs( normalNode ) );
bf = div( bf, dot( bf, vec3( 1.0 ) ) );
// Triplanar mapping
const tx = mul( positionNode.yz, scaleNode );
const ty = mul( positionNode.zx, scaleNode );
const tz = mul( positionNode.xy, scaleNode );
// Base color
const textureX = textureXNode.value;
const textureY = textureYNode !== null ? textureYNode.value : textureX;
const textureZ = textureZNode !== null ? textureZNode.value : textureX;
const cx = mul( texture( textureX, tx ), bf.x );
const cy = mul( texture( textureY, ty ), bf.y );
const cz = mul( texture( textureZ, tz ), bf.z );
return add( cx, cy, cz );
}
}
export default TriplanarTexturesNode;