Parsing AssetProperty to UnifiedBitmap?

[Anonymous]

I'm fairly new to the Revit API + some aspects of C#.

I'm having some problems getting the final varaibles I require from a material in order to start a transaction within Revit. The post by Jeremy Tammick has been very useful.

https://thebuildingcoder.typepad.com/blog/2017/10/material-texture-path.html

However the line :

AssetPropertyString path = connectedAsset[
            UnifiedBitmap.UnifiedbitmapBitmap] 
              as AssetPropertyString;

is causing me this error
"Cannot apply indexing with [] to an expression of type 'Autodesk.Revit.DB.Visual.AssetProperty'.

Which makes sense to me because connected asset is an instance and not a List, IList or an Array. Innevitably I am trying to access and edit the Bitmaps link, offset and size parameters. I think I need to somehow pass the UnifiedBitmap to a variable, but can't seem to find the function in the API.

Any help would be amazing.

[jeremy_tammik]

Welcome to the Revit API! 

I am glad you find the blog post useful.

You say, connected asset is an instance...

In Revit, one would usually use the word 'instance' to refer to a family instance element in the BIM model.

In C#, everything is an object and hence an instance of some class. Hence, every single List, IList or Array object is indeed an instance.

So I do not understand your statement at all.

In the blog post, connectedAsset is an Asset object:

        Asset connectedAsset = aProperty
          .GetConnectedProperty( 0 ) as Asset;

So, it is hard to say anything more just looking at your question so far.

[Anonymous]

Sorry, you are correct in your phrasing.

I guess I should be saying, that connectedAsset isnt a collection, not an instance. So I am getting errors as connected_asset is not a collection.

I made the change you just recomended. I've made the change you mentioned and it still doesnt seem to be working.

Asset connected_asset = asset_property.GetConnectedProperty(0) as Asset;
														if(connected_asset.Name == "UnifiedBitmapSchema")
{
AssetPropertyString bitmap_path = connected_asset[UnifiedBitmap.UnifiedbitmapBitmap] as AssetPropertyString;
}

Errors :

Argument 1: cannot convert from 'string' to 'int' (CS1503) -

The best overloaded method match for 'Autodesk.Revit.DB.Visual.AssetProperties.this[int]'

I really want to be able to get and set t he image path, image width, height and offsets within Revit.

Does this help frame my problem?

[Anonymous]

Hey Jeremy,

I've taken and edited your code slightly in the marco editor and it still produces the error that I've been talking about. Is it possible that this is a limitation of the macro editor?

using System;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB;
using Autodesk.Revit.DB.Visual;
using Autodesk.Revit.UI.Selection;
using System.Collections.Generic;
using System.Linq;

namespace Test
{
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.DB.Macros.AddInId("BE0FCACF-2A26-4DB0-95A1-2FF7F4070582")]
	public partial class ThisApplication
	{
		private void Module_Startup(object sender, EventArgs e)
		{

		}

		private void Module_Shutdown(object sender, EventArgs e)
		{

		}

		#region Revit Macros generated code
		private void InternalStartup()
		{
			this.Startup += new System.EventHandler(Module_Startup);
			this.Shutdown += new System.EventHandler(Module_Shutdown);
		}
		#endregion
		public void TestA()
		{
			Document doc = ActiveUIDocument.Document;
			string[] targetMaterialNames = {

		    // A standard Revit material, with 
    		// textures in standard paths. 
    		"Brick, Common",

		    // A material with a single image from 
    		// another non-material library path
    		"Local Path Material"
  			};

    // Find materials
    FilteredElementCollector fec 
      = new FilteredElementCollector( doc );

    fec.OfClass( typeof( Material ) );

    IEnumerable<Material> targetMaterials 
      = fec.Cast<Material>().Where<Material>( mtl => 
        targetMaterialNames.Contains( mtl.Name ) );

    foreach( Material material in targetMaterials )
    {
      // Get appearance asset for read
      ElementId appearanceAssetId = material
        .AppearanceAssetId;

      AppearanceAssetElement appearanceAssetElem 
        = doc.GetElement( appearanceAssetId )
          as AppearanceAssetElement;

      Asset asset = appearanceAssetElem
        .GetRenderingAsset();

      // Walk through all first level assets to find 
      // connected Bitmap properties.  Note: it is 
      // possible to have multilevel connected 
      // properties with Bitmaps in the leaf nodes.  
      // So this would need to be recursive.

      int size = asset.Size;
      for( int assetIdx = 0; assetIdx < size; assetIdx++ )
      {
        AssetProperty aProperty = asset[assetIdx];

        if( aProperty.NumberOfConnectedProperties < 1 )
          continue;

        // Find first connected property.  
        // Should work for all current (2018) schemas.  
        // Safer code would loop through all connected
        // properties based on the number provided.

        Asset connectedAsset = aProperty
          .GetConnectedProperty( 0 ) as Asset;

        // We are only checking for bitmap connected assets. 
             
        if( connectedAsset.Name == "UnifiedBitmapSchema" )
        {
          // This line is 2018.1 & up because of the 
          // property reference to UnifiedBitmap
          // .UnifiedbitmapBitmap.  In earlier versions,
          // you can still reference the string name 
          // instead: "unifiedbitmap_Bitmap"

          AssetPropertyString path = connectedAsset[
            UnifiedBitmap.UnifiedbitmapBitmap] 
              as AssetPropertyString;

          // This will be a relative path to the 
          // built -in materials folder, addiitonal 
          // render appearance folder, or an 
          // absolute path.

          TaskDialog.Show( "Connected bitmap", 
            String.Format( "{0} from {2}: {1}", 
              aProperty.Name, path.Value, 
              connectedAsset.LibraryName ) );
        }
      }
    }
  }
			
			
			
			
		
	}
}