Path to material texture

Rhino Developer
,
1

I am working on creating an event handler to give a feedback to the user based on the path of the texture file on a PBR material when they add it to the file. The following is what I came up with.

On trying with several PBR materials, I keep getting the number of paths 0. What am I missing?

P.S. I have added the event handler to the plugin and the event handler seems to work just fine.

using System.Collections.Generic;
using System.Linq;
using Rhino.Render;
using Rhino;

namespace HeroRhino.Handlers
{

    public class MaterialPaths : RenderMaterial
    {
        private List<string> _filesToEmbed;
        public override string TypeName => "WombatMaterial";
        public override string TypeDescription => "WombatMaterial";

        public MaterialPaths(IEnumerable<string> filesToEmbed)
        {
            _filesToEmbed = new List<string>(filesToEmbed);
        }
        public override IEnumerable<string> FilesToEmbed => _filesToEmbed;
  
    }


    public class MaterialPathHandler
    {
        public MaterialPathHandler()
        {
            RenderContent.ContentAdded += OnContentAdded;
        }

        private void OnContentAdded(object sender, RenderContentEventArgs e)
        {
            if (e.Content is RenderMaterial material)
            {
                MaterialPaths materialPaths = new MaterialPaths(material.FilesToEmbed);
                List<string> paths = materialPaths.FilesToEmbed.ToList();
                RhinoApp.WriteLine($"Paths: {paths.Count}");
                RhinoApp.WriteLine($"Material Added: {material.Name}");
            }
        }

        public void Start()
        {
            RenderContent.ContentAdded += OnContentAdded;
        }

        public void Stop()
        {
            RenderContent.ContentAdded -= OnContentAdded;
        }
        
    }
}
2

This is likely that the new RenderMaterial “MaterialPaths” lost the custom field “_filesToEmbed” when you add this new material to the Rhino document. You might want to check if there is a way to serialize the custom data for RenderMaterial.

3

Thanks for looking into it @mingbo. I figured out what I was doing wrong. I was not accessing the texture correctly. The working version is shown in this post.