ToonLightingModel: Honor `ambientOcclusion`. (#28822)

src/nodes/functions/ToonLightingModel.js

@@ -38,10 +38,12 @@ class ToonLightingModel extends LightingModel {
 
 	}
 
-	indirectDiffuse( { irradiance, reflectedLight } ) {
+	indirectDiffuse( { ambientOcclusion, irradiance, reflectedLight } ) {
 
 		reflectedLight.indirectDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor } ) ) );
 
+		reflectedLight.indirectDiffuse.mulAssign( ambientOcclusion );
+
 	}
 
 }