cscの作法 その599

概要

cscの作法、調べてみた。
wpf3d、やってみた。
練習問題やってみた。

練習問題

objファイルを読み取って表示せよ。

写真

サンプルコード

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Media3D;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;

class Main3d: Window {
	public Main3d() {
		var mesh = ObjLoader.Load(@"C:\Users\ore\csc\tetrahedron.obj");
		var material = new DiffuseMaterial(new SolidColorBrush(Colors.Blue));
		var geometry = new GeometryModel3D(mesh, material);
		var modelVisual = new ModelVisual3D();
		modelVisual.Content = geometry;
		var cam = new PerspectiveCamera();
		cam.Position = new Point3D(0, 0, 2);
		var light = new DirectionalLight();
		var vp3d = new Viewport3D();
		vp3d.Camera = cam;
		vp3d.Children.Add(modelVisual);
		vp3d.Children.Add(new ModelVisual3D() {
			Content = light
		});
		Width = 400;
		Height = 400;
		Content = vp3d;
	}
	public static class ObjLoader {
		public static MeshGeometry3D Load(string path) {
			var mesh = new MeshGeometry3D();
			if (!File.Exists(path))
			{
				throw new FileNotFoundException("Unable to open \"" + path + "\", does not exist.");
			}
			else
			{
				Console.Write("ok");
			}
			using(StreamReader streamReader = new StreamReader(path))
			{
				while(!streamReader.EndOfStream)
				{
					List<string> words = new List<string>(streamReader.ReadLine().ToLower().Split(' '));
					words.RemoveAll(s => s == string.Empty);
					if (words.Count == 0)
						continue;
					string type = words[0];
					words.RemoveAt(0);
					switch(type)
					{
					case "v":
						Console.Write("v");
						mesh.Positions.Add(new Point3D(float.Parse(words[0]), float.Parse(words[1]), float.Parse(words[2])));
					break;
					case "vt":
   					break;
					case "vn":
					break;
					case "f":
						Console.Write("f");
						foreach(string w in words)
						{
							if (w.Length == 0)
								continue;
							string[] comps = w.Split('/');
							mesh.TriangleIndices.Add(int.Parse(comps[0]) - 1);
						}
					break;
					default:
					break;
					}
				}
			}
			return mesh;
		}
	}
	[STAThread]
	static void Main() {
		var wnd = new Main3d();
		wnd.ShowDialog();
	}
}

以上。