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node_modules/three/examples/jsm/nodes/functions/BSDF/EnvironmentBRDF.js

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+import DFGApprox from './DFGApprox.js';
+import { tslFn } from '../../shadernode/ShaderNode.js';
+
+const EnvironmentBRDF = tslFn( ( inputs ) => {
+
+	const { dotNV, specularColor, specularF90, roughness } = inputs;
+
+	const fab = DFGApprox( { dotNV, roughness } );
+	return specularColor.mul( fab.x ).add( specularF90.mul( fab.y ) );
+
+} );
+
+export default EnvironmentBRDF;