topic Re: Revit modify materials - Method not found in Revit API Forum

Revit modify materials - Method not found

SwainStrain — Sat, 06 Feb 2021 09:08:01 GMT

Hi everybody,

i'm trying to modify the appearance of the "Default" material with the AppearanceAssetEditScope class. I've created the SetDiffuseColor class:

private static void SetDiffuseColor(Material material, Color color) { ElementId appearanceAssetId = material.AppearanceAssetId; AppearanceAssetElement assetElem = material.Document.GetElement(appearanceAssetId) as AppearanceAssetElement; // A transaction is necessary. Multiple changes to the same asset can be made in one transaction if required. using (Transaction t = new Transaction(assetElem.Document, "Change material color")) { t.Start(); using (AppearanceAssetEditScope editScope = new AppearanceAssetEditScope(assetElem.Document)) { Asset editableAsset = editScope.Start(assetElem.Id); // returns an editable copy of the appearance asset // unlike AppearanceAssetElement.GetRenderingAsset(), the edit scope // sets up the asset for editing using the classes and utilities from // MaterialsManager. The scope can keep a mapping from asset to Protein // class members that are obtained from the asset, to permit use of // Protein validation. If the Asset was not obtained from an edit scope, // the setter operations for asset properties must throw. // Try to change values AssetPropertyDoubleArray4d genericDiffuseProperty = editableAsset["generic_diffuse"] as AssetPropertyDoubleArray4d; genericDiffuseProperty.SetValueAsColor(color); // 4 length double asset properties often represent colors. // Shortcut methods should be added to work directly with Color objects // for these types. // Commit the entire edit scope. If the appearance asset element is used in one or more materials, they will be // updated to match any changes made. editScope.Commit(true); } t.Commit(); } }

and use it in my main Command class:

public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements) { UIApplication app = commandData.Application; UIDocument uidoc = app.ActiveUIDocument; Document doc = uidoc.Document; CreateMaterial(doc); //Collect Materials FilteredElementCollector coll2 = new FilteredElementCollector(doc).OfClass(typeof(Material)); IList<Element> mats = coll2.ToElements() as IList<Element>; Material myMaterial = null; Color matColor = new Color(255,255,255); foreach (var m in mats) if (m.Name == "Default") { myMaterial = m as Material; } SetDiffuseColor(myMaterial, matColor); return Result.Succeeded; }

The result is the following :

i don't understand what am i doing wrong, any help is appreciated.

Thank you very much!

Re: Revit modify materials - Method not found

RPTHOMAS108 — Sat, 06 Feb 2021 11:39:29 GMT

From the edit scope there is likely a class of AssetProperties. This has default 'item' property that takes an integer for the index of the Asset (not a string).

It has another property named FindByName use that as is done in the example in RevitAPI.chm for AppearanceAssetEditScope.

Re: Revit modify materials - Method not found

SwainStrain — Sat, 06 Feb 2021 12:44:58 GMT

Thank you @RPTHOMAS108 ! It seems it works fine now for "Default" material!

However, if i try to do the same thing with a material I've just created, it gives another error:

Is it because I've created this material with the Material.Create method?

Thank you very much again!

Re: Revit modify materials - Method not found

TripleM-Dev.net — Sat, 06 Feb 2021 14:33:54 GMT

Hi,

Check if

material.AppearanceAssetId

is a valid ElementId, I believe creating a material doesn't include the AppearanceAsset.

After creating the Material also add a AppearanceAsset.

The Revit UI adds a 'Generic' asset (Temporarily I may add!) if one is missing when opening the MaterialBrowser.

This will only become part of the Material after a edit is done on the material in the browser.

- Michel

Re: Revit modify materials - Method not found

SwainStrain — Wed, 10 Feb 2021 10:44:37 GMT

Many thanks @TripleM-Dev.net , this is exactly what i've done, it works fine now.

Thank you all!