API Reference > imodeljs-common > Rendering > FeatureAppearanceProvider > FeatureAppearanceProvider.supplement FeatureAppearanceProvider.supplement Function Create a provider that obtains each feature's appearance from the source, and if the feature is visible, modifies the appearance. supplement(supplementAppearance: (appearance: FeatureAppearance) => FeatureAppearance): FeatureAppearanceProvider Parameter Type Description supplementAppearance (appearance: FeatureAppearance) => FeatureAppearance A function accepting the feature's base appearance and returning a supplemental appearance. Returns - FeatureAppearanceProvider Defined in core/common/src/FeatureSymbology.ts Line 650 Last Updated: 12 June, 2024