The trim operation applies the current shape's trim planes to the geometry of the current shape. Trim planes are generated by a component split and can be enabled and disabled by the trim attribute. Trimming is automatically performed when a primitive or an asset is inserted in the scope. Use the geometry.isInstanced function to check if an inserted asset was trimmed.
A roof face is extruded and trimmed by both vertical and horizontal trim planes. The trim planes are generated by the component split. Setting trim.horizontal to true activates horizontal trimming.
A cube is inserted in the scope of a roof face. The insert and primitive operations automatically trim the geometry. Horizontal trim planes are not enabled by default.