Bitmap texture evaluator, Rhino 5, C#

MaterialTextureEvaluatorCommand.cs

using System;
using System.Collections.Generic;
using Rhino;
using Rhino.Commands;
using Rhino.Geometry;
using Rhino.Input;
using Rhino.Input.Custom;

namespace MaterialTextureEvaluator
{
	[System.Runtime.InteropServices.Guid("af615033-e864-4a1e-afc8-463429426672")]
		public class MaterialTextureEvaluatorCommand : Command
	{
		public MaterialTextureEvaluatorCommand()
		{
			// Rhino only creates one instance of each command class defined in a
			// plug-in, so it is safe to store a refence in a static property.
			Instance = this;
		}

		///<summary>The only instance of this command.</summary>
		public static MaterialTextureEvaluatorCommand Instance
		{
			get; private set;
		}

		///<returns>The command name as it appears on the Rhino command line.</returns>
		public override string EnglishName
		{
			get { return "MaterialTextureEvaluatorCommand"; }
		}

		protected override Result RunCommand(RhinoDoc doc, RunMode mode)
		{

			int index = doc.Materials.Add();
			Rhino.DocObjects.Material mat = doc.Materials[index];
			mat.SetBitmapTexture("C:\\colgrid.png");
			mat.Name = "Testing";
			mat.DiffuseColor = System.Drawing.Color.Chocolate;
			mat.SpecularColor = System.Drawing.Color.CadetBlue;
			mat.CommitChanges();

			var rm = Rhino.Render.RenderMaterial.CreateBasicMaterial(mat);

			if(rm == null)
			{
				RhinoApp.WriteLine("no rendermaterial");
				return Result.Failure;
			}

			var diffslot = rm.TextureChildSlotName(Rhino.Render.RenderMaterial.StandardChildSlots.Diffuse);
			var rt = rm.FindChild(diffslot) as Rhino.Render.RenderTexture;

			using (var eval = rt.CreateEvaluator())
			{
				var zp = new Vector3d(0.0, 0.0, 0.0);
				for (int y = 0; y < 15; y++)
				{
					for (int x = 0; x < 15; x++)
					{
						var p = new Point3d(x / 15.0, y / 15.0, 0.0); // create a UV coordinate

						var c = eval.GetColor(p, zp, zp);

						if (y < 10 && x < 10) RhinoApp.WriteLine($"{p.X},{p.Y},{p.Z} - {c.R} {c.G} {c.B}");
					}
				}
			}

			return Result.Success;
		}
	}
}