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