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node_modules/three/examples/jsm/nodes/fog/FogExp2Node.js

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+import FogNode from './FogNode.js';
+import { positionView } from '../accessors/PositionNode.js';
+import { addNodeClass } from '../core/Node.js';
+import { addNodeElement, nodeProxy } from '../shadernode/ShaderNode.js';
+
+class FogExp2Node extends FogNode {
+
+	constructor( colorNode, densityNode ) {
+
+		super( colorNode );
+
+		this.isFogExp2Node = true;
+
+		this.densityNode = densityNode;
+
+	}
+
+	setup() {
+
+		const depthNode = positionView.z.negate();
+		const densityNode = this.densityNode;
+
+		return densityNode.mul( densityNode, depthNode, depthNode ).negate().exp().oneMinus();
+
+	}
+
+}
+
+export default FogExp2Node;
+
+export const densityFog = nodeProxy( FogExp2Node );
+
+addNodeElement( 'densityFog', densityFog );
+
+addNodeClass( 'FogExp2Node', FogExp2Node );