API Reference > imodeljs-frontend > Rendering > GraphicBuilderOptions > wantNormals wantNormals wantNormals: undefined | boolean Controls whether normals are generated for surfaces. Normals allow 3d geometry to receive lighting; without them the geometry will be unaffected by lighting. By default, normals are generated only for graphics of type GraphicType.Scene; or for any type of graphic if GraphicBuilder.wantEdges is true, because normals are required to prevent z-fighting between surfaces and their edges. This default can be overridden by explicitly specifying true or false. see GraphicType for a description of whether and how different types of graphics are affected by lighting. Defined in core/frontend/src/render/GraphicBuilder.ts Line 143 Last Updated: 11 June, 2024