107 lines
2.5 KiB
JavaScript
107 lines
2.5 KiB
JavaScript
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import TempNode from '../core/TempNode.js';
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import { add } from '../math/OperatorNode.js';
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import { modelNormalMatrix } from '../accessors/ModelNode.js';
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import { normalView } from '../accessors/NormalNode.js';
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import { positionView } from '../accessors/PositionNode.js';
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import { TBNViewMatrix } from '../accessors/AccessorsUtils.js';
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import { uv } from '../accessors/UVNode.js';
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import { faceDirection } from './FrontFacingNode.js';
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import { addNodeClass } from '../core/Node.js';
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import { addNodeElement, tslFn, nodeProxy, vec3 } from '../shadernode/ShaderNode.js';
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import { TangentSpaceNormalMap, ObjectSpaceNormalMap } from 'three';
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// Normal Mapping Without Precomputed Tangents
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// http://www.thetenthplanet.de/archives/1180
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const perturbNormal2Arb = tslFn( ( inputs ) => {
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const { eye_pos, surf_norm, mapN, uv } = inputs;
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const q0 = eye_pos.dFdx();
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const q1 = eye_pos.dFdy();
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const st0 = uv.dFdx();
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const st1 = uv.dFdy();
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const N = surf_norm; // normalized
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const q1perp = q1.cross( N );
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const q0perp = N.cross( q0 );
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const T = q1perp.mul( st0.x ).add( q0perp.mul( st1.x ) );
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const B = q1perp.mul( st0.y ).add( q0perp.mul( st1.y ) );
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const det = T.dot( T ).max( B.dot( B ) );
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const scale = faceDirection.mul( det.inverseSqrt() );
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return add( T.mul( mapN.x, scale ), B.mul( mapN.y, scale ), N.mul( mapN.z ) ).normalize();
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} );
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class NormalMapNode extends TempNode {
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constructor( node, scaleNode = null ) {
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super( 'vec3' );
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this.node = node;
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this.scaleNode = scaleNode;
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this.normalMapType = TangentSpaceNormalMap;
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}
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setup( builder ) {
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const { normalMapType, scaleNode } = this;
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let normalMap = this.node.mul( 2.0 ).sub( 1.0 );
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if ( scaleNode !== null ) {
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normalMap = vec3( normalMap.xy.mul( scaleNode ), normalMap.z );
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}
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let outputNode = null;
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if ( normalMapType === ObjectSpaceNormalMap ) {
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outputNode = modelNormalMatrix.mul( normalMap ).normalize();
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} else if ( normalMapType === TangentSpaceNormalMap ) {
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const tangent = builder.hasGeometryAttribute( 'tangent' );
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if ( tangent === true ) {
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outputNode = TBNViewMatrix.mul( normalMap ).normalize();
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} else {
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outputNode = perturbNormal2Arb( {
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eye_pos: positionView,
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surf_norm: normalView,
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mapN: normalMap,
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uv: uv()
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} );
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}
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}
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return outputNode;
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}
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}
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export default NormalMapNode;
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export const normalMap = nodeProxy( NormalMapNode );
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addNodeElement( 'normalMap', normalMap );
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addNodeClass( 'NormalMapNode', NormalMapNode );
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