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public/sdk/three/jsm/nodes/functions/material/getGeometryRoughness.js

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+import { normalGeometry } from '../../accessors/NormalNode.js';
+import { tslFn } from '../../shadernode/ShaderNode.js';
+
+const getGeometryRoughness = tslFn( () => {
+
+	const dxy = normalGeometry.dFdx().abs().max( normalGeometry.dFdy().abs() );
+	const geometryRoughness = dxy.x.max( dxy.y ).max( dxy.z );
+
+	return geometryRoughness;
+
+} );
+
+export default getGeometryRoughness;

public/sdk/three/jsm/nodes/functions/material/getRoughness.js

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+import getGeometryRoughness from './getGeometryRoughness.js';
+import { tslFn } from '../../shadernode/ShaderNode.js';
+
+const getRoughness = tslFn( ( inputs ) => {
+
+	const { roughness } = inputs;
+
+	const geometryRoughness = getGeometryRoughness();
+
+	let roughnessFactor = roughness.max( 0.0525 ); // 0.0525 corresponds to the base mip of a 256 cubemap.
+	roughnessFactor = roughnessFactor.add( geometryRoughness );
+	roughnessFactor = roughnessFactor.min( 1.0 );
+
+	return roughnessFactor;
+
+} );
+
+export default getRoughness;