SolidWorks supports a mode for assembly components called lightweight. A lightweight component contains only a small subset of its data for display purposes, which increases system performance when loading assemblies. The extra data is not loaded until it is needed.

Because lightweight components contain only a small subset of the data, applications cannot query for all the information that is available to a fully resolved component. To avoid problems in this area, IComponent2::IsHidden and IComponent2::IsSuppressed return true if a component is flagged as lightweight. IComponent2::IGetBody returns a special HRESULT value if a component is lightweight.

To take advantage of lightweight components, use IComponent2::GetSuppression, IComponent2::SetSuppression, IAssemblyDoc::ResolveAllLightWeightComponents, and IAssemblyDoc::GetLightWeightComponentCount.

To find or control whether SolidWorks is using lightweight components see:

ISldWorks::SetUserPreferenceToggle - swAutoLoadPartsLightweight controls whether assemblies are loaded with lightweight components
ISldWorks::SetUserPreferenceIntegerValue - swResolveLightweight controls how lightweight components are resolved

Search 'Work with Lightweight Components' in the SOLIDWORKS Knowledge Base.

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