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node_modules/three/examples/jsm/nodes/utils/SpecularMIPLevelNode.js

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+import Node, { addNodeClass } from '../core/Node.js';
+import { maxMipLevel } from './MaxMipLevelNode.js';
+import { nodeProxy } from '../shadernode/ShaderNode.js';
+
+class SpecularMIPLevelNode extends Node {
+
+	constructor( textureNode, roughnessNode = null ) {
+
+		super( 'float' );
+
+		this.textureNode = textureNode;
+		this.roughnessNode = roughnessNode;
+
+	}
+
+	setup() {
+
+		const { textureNode, roughnessNode } = this;
+
+		// taken from here: http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html
+
+		const maxMIPLevelScalar = maxMipLevel( textureNode );
+
+		const sigma = roughnessNode.mul( roughnessNode ).mul( Math.PI ).div( roughnessNode.add( 1.0 ) );
+		const desiredMIPLevel = maxMIPLevelScalar.add( sigma.log2() );
+
+		return desiredMIPLevel.clamp( 0.0, maxMIPLevelScalar );
+
+	}
+
+}
+
+export default SpecularMIPLevelNode;
+
+export const specularMIPLevel = nodeProxy( SpecularMIPLevelNode );
+
+addNodeClass( 'SpecularMIPLevelNode', SpecularMIPLevelNode );