cscの作法 その592

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

wpf3dで、球を表示せよ。

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;

class Main3d: Window {
	public Main3d() {
		var stacks = 12;
		var slices = 16;
		var pos = new Point3DCollection();
		var idx = new Int32Collection();
		for (var st = 0; st <= stacks; st++) 
		{
			var a = Math.PI * st / stacks;
			var y = Math.Cos(a);
			var r = Math.Sin(a);
			for (var sl = 0; sl <= slices; sl++) 
			{
				var b = 2 * Math.PI * sl / slices + Math.PI;
				var z = Math.Cos(b);
				var x = Math.Sin(b);
				pos.Add(new Point3D(x * r, y, z * r));
			}
		}
		for (var st = 0; st < stacks; st++) 
		{
			var h0 = (slices + 1) * st;
			var h1 = (slices + 1) * (st + 1);
			for (var sl = 0; sl < slices; sl++) 
			{
				var i0 = h0 + sl;
				var i1 = h1 + sl;
				var i2 = h0 + sl + 1;
				var i3 = h1 + sl + 1;
				idx.Add(i0);
				idx.Add(i1);
				idx.Add(i2);
				idx.Add(i3);
				idx.Add(i2);
				idx.Add(i1);
			}
		}
		var model = new GeometryModel3D();
		model.Geometry = new MeshGeometry3D() {
			Positions = pos,
			TriangleIndices = idx,
		};
		model.Material = new DiffuseMaterial(Brushes.LightGreen);
		var light = new DirectionalLight();
		light.Direction = new Vector3D(-1, -2, -3);
		var cam = new PerspectiveCamera();
		cam.Position = new Point3D(0, 0, 5);
		var vp3d = new Viewport3D();
		vp3d.Camera = cam;
		vp3d.Children.Add(new ModelVisual3D() { 
			Content = model 
		});
		vp3d.Children.Add(new ModelVisual3D() { 
			Content = light 
		});
		Width = 400;
		Height = 400;
		Content = vp3d;
	}
	[STAThread]
	static void Main() {
		var wnd = new Main3d();
		wnd.ShowDialog();
	}
}

以上。