Unable to get AppearanceAssetId from material

Anonymous — Fri, 07 Feb 2020 13:27:35 GMT

I am attempting to create a new material and then apply a image to the material. I need the AppearanceAssetId in order to use "AppearanceAssetEditScope". The problem is that AppearanceAssetId always returns -1 even after creating a material with the following code.

private void CreateMaterial(Document document)
{
SubTransaction createMaterial = new SubTransaction(document);
createMaterial.Start();
Material materialNew = null;

//Try to copy an existing material. If it is not available, create a new one.
Material masonry_Brick = GetMaterial(document, "Brick, Common");
if (masonry_Brick != null)
{
materialNew = masonry_Brick.Duplicate(masonry_Brick.Name + "_new");
System.Diagnostics.Debug.WriteLine(masonry_Brick.MaterialClass);
materialNew.MaterialClass = "Brick";
}
else
{
ElementId idNew = Material.Create(document, "New Brick Sample");
materialNew = document.GetElement(idNew) as Material;
materialNew.Color = new Autodesk.Revit.DB.Color(255, 0, 0);
}

createMaterial.Commit();

// This is always -1?
//materialNew.AppearanceAssetId

}

I have been reading the building coders content but can't seem to get that Id?

https://thebuildingcoder.typepad.com/blog/2019/04/set-material-texture-path-in-editscope.html#2

The following code does

Re: Unable to get AppearanceAssetId from material

Anonymous — Fri, 07 Feb 2020 16:21:51 GMT

This was actually a misunderstanding on my side on how assets work with materials. I ended up creating a duplicate asset then assigning it to my duplicate material

ElementId appearanceAssetId = materialNew.AppearanceAssetId;
AppearanceAssetElement assetElem = materialNew.Document.GetElement(appearanceAssetId) as AppearanceAssetElement;

AppearanceAssetElement duplicateAssetElement = assetElem.Duplicate(LayerName + "-asset");

materialNew.AppearanceAssetId = duplicateAssetElement.Id;

topic Unable to get AppearanceAssetId from material in Revit API Forum

Unable to get AppearanceAssetId from material

Re: Unable to get AppearanceAssetId from material