AppearanceAssetId Property

The ElementId of the AppearanceAssetElement.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: (
Since: 2014


public ElementId AppearanceAssetId { get; set; }
Visual Basic
Public Property AppearanceAssetId As ElementId
Visual C++
property ElementId^ AppearanceAssetId {
	ElementId^ get ();
	void set (ElementId^ value);

Field Value

The id of the AppearanceAssetElement, or InvalidElementId if the material does not have an associated appearance asset.


This is the id to the element that contains visual material information used for rendering. In some cases where the material is created without setting up custom render appearance properties (for example, when the material is created via an import, or when it is created by the API), this property will be InvalidElementId. In that situation the standard material properties such as Color and Transparency will dictate the appearance of the material during rendering.


Copy C#
private void ReadMaterialAppearanceProp(Document document, Material material)
   ElementId appearanceId = material.AppearanceAssetId;
   AppearanceAssetElement appearanceElem = document.GetElement(appearanceId) as AppearanceAssetElement;
   Asset theAsset = appearanceElem.GetRenderingAsset();
   string libraryName = theAsset.LibraryName;
   string title = theAsset.Title;

   // The predefined asset can be empty. at this time, get the system appearance asset instead.
   if (theAsset.Size == 0)
      IList<Asset> systemAppearanceAssets = document.Application.GetAssets(AssetType.Appearance);
      foreach (Asset systemAsset in systemAppearanceAssets)
         if(theAsset.LibraryName == systemAsset.LibraryName
            && theAsset.Name == systemAsset.Name)
            // Read the Asset information here.
Private Sub ReadMaterialAppearanceProp(document As Document, material As Material)
    Dim appearanceId As ElementId = material.AppearanceAssetId
    Dim appearanceElem As AppearanceAssetElement = TryCast(document.GetElement(appearanceId), AppearanceAssetElement)
    Dim theAsset As Asset = appearanceElem.GetRenderingAsset()
    Dim libraryName As String = theAsset.LibraryName
    Dim title As String = theAsset.Title

    ' The predefined asset can be empty. at this time, get the system appearance asset instead.
    If theAsset.Size = 0 Then
        Dim systemAppearanceAssets As IList(Of Asset) = document.Application.GetAssets(AssetType.Appearance)
        For Each systemAsset As Asset In systemAppearanceAssets
            If theAsset.LibraryName = systemAsset.LibraryName AndAlso theAsset.Name = systemAsset.Name Then
                ' Read the Asset information here.
                Exit For
            End If
    End If
End Sub


Exception Condition
Autodesk.Revit.Exceptions ArgumentNullException When setting this property: A non-optional argument was NULL

See Also