preact

frontend/node_modules/three/examples/jsm/nodes/utils/MatcapUVNode.js

@@ -0,0 +1,30 @@
+import TempNode from '../core/TempNode.js';
+import { transformedNormalView } from '../accessors/NormalNode.js';
+import { positionViewDirection } from '../accessors/PositionNode.js';
+import { nodeImmutable, vec2, vec3 } from '../shadernode/ShaderNode.js';
+import { addNodeClass } from '../core/Node.js';
+
+class MatcapUVNode extends TempNode {
+
+	constructor() {
+
+		super( 'vec2' );
+
+	}
+
+	setup() {
+
+		const x = vec3( positionViewDirection.z, 0, positionViewDirection.x.negate() ).normalize();
+		const y = positionViewDirection.cross( x );
+
+		return vec2( x.dot( transformedNormalView ), y.dot( transformedNormalView ) ).mul( 0.495 ).add( 0.5 ); // 0.495 to remove artifacts caused by undersized matcap disks
+
+	}
+
+}
+
+export default MatcapUVNode;
+
+export const matcapUV = nodeImmutable( MatcapUVNode );
+
+addNodeClass( 'MatcapUVNode', MatcapUVNode );