摄像机矩阵变换

public partial class MainForm : Form
   {
       public MainForm()
       {
           InitializeComponent();
 
           this.InitialDX();
       }
 
       private Device device;
       private Vector3 camPosition = new Vector3(0, 30, -50);
       private Vector3 camTarget = new Vector3(0, 0, 0);
       private Vector3 camUp = new Vector3(0, 1, 0);
       private float angle = 0.01f;
 
       private void InitialDX()
       {
           PresentParameters presentParams = new PresentParameters();
           presentParams.Windowed = true;
           presentParams.SwapEffect = SwapEffect.Discard;
 
           device = new Device(
               0,
               DeviceType.Hardware,
               this,
               CreateFlags.SoftwareVertexProcessing,
               presentParams);
 
           device.RenderState.Lighting = false;
           device.RenderState.CullMode = Cull.None;
 
           device.Transform.View = Matrix.LookAtLH(
               camPosition,
               camTarget,
               camUp);
 
           device.Transform.Projection = Matrix.PerspectiveFovLH(
               (float)Math.PI / 4,
               this.Width / this.Height,
               10,
               500);
 
           Texture texture = Texture.FromBitmap(
               device,
               (Bitmap)Image.FromFile("w.png"),
               Usage.None,
               Pool.Managed);
           device.SetTexture(0, texture);
       }
 
       protected override void OnPaint(PaintEventArgs e)
       {
           base.OnPaint(e);
 
           this.DrawDX();
       }
 
       private void DrawDX()
       {
           device.Clear(ClearFlags.Target, Color.Teal, 1f, 0);
           device.BeginScene();
           this.DrawMyGraphics();
           device.EndScene();
           device.Present();
       }
 
       private void DrawMyGraphics()
       {
           CustomVertex.PositionTextured[] vertexs = new CustomVertex.PositionTextured[4];
 
           vertexs[0].Position = new Vector3(10f, 0, 10f);
           vertexs[1].Position = new Vector3(10f, 0, -10f);
           vertexs[2].Position = new Vector3(-10f, 0, -10f);
           vertexs[3].Position = new Vector3(-10f, 0, 10f);
 
           vertexs[0].Tu = 1f;
           vertexs[0].Tv = 0f;
 
           vertexs[1].Tu = 1f;
           vertexs[1].Tv = 1f;
 
           vertexs[2].Tu = 0f;
           vertexs[2].Tv = 1f;
 
           vertexs[3].Tu = 0f;
           vertexs[3].Tv = 0f;
 
           device.VertexFormat = CustomVertex.PositionTextured.Format;
           device.DrawUserPrimitives(PrimitiveType.TriangleFan,
               2,
               vertexs);
       }
 
       protected override void OnKeyDown(KeyEventArgs e)
       {
           base.OnKeyDown(e);
 
           Vector4 tempV;
           switch (e.KeyCode)
           {
               case Keys.Add: //放大
                   {
                       camPosition.Subtract(camTarget);
                       camPosition.Scale(0.95f);
                       camPosition.Add(camTarget);
                   }
                   break;
               case Keys.Subtract: //缩小
                   {
                       camPosition.Subtract(camTarget);
                       camPosition.Scale(1.05f);
                       camPosition.Add(camTarget);
                   }
                   break;
               case Keys.Up: //摄像机绕X轴顺时针旋转（目标逆时针旋转）
                   {
                       camPosition.Subtract(camTarget);
                       tempV = Vector3.Transform(
                           camPosition,
                           Matrix.RotationQuaternion(
                               Quaternion.RotationAxis(new Vector3(
                                   device.Transform.View.M11,
                                   device.Transform.View.M21,
                                   device.Transform.View.M31),
                                   angle)));
 
                       camPosition.X = tempV.X + camTarget.X;
                       camPosition.Y = tempV.Y + camTarget.Y;
                       camPosition.Z = tempV.Z + camTarget.Z;                                                
                   }
                   break;
               case Keys.Down: //摄像机绕X轴逆时针旋转
                   {
                       camPosition.Subtract(camTarget);
                       tempV = Vector3.Transform(
                           camPosition,
                           Matrix.RotationQuaternion(
                               Quaternion.RotationAxis(new Vector3(
                                   device.Transform.View.M11,
                                   device.Transform.View.M21,
                                   device.Transform.View.M31),
                                   -angle)));
 
                       camPosition.X = tempV.X + camTarget.X;
                       camPosition.Y = tempV.Y + camTarget.Y;
                       camPosition.Z = tempV.Z + camTarget.Z;
                   }
                   break;
               case Keys.Left: //摄像机绕Y轴顺时针旋转（目标逆时针旋转）
                   {
                       camPosition.Subtract(camTarget);
                       tempV = Vector3.Transform(
                           camPosition,
                           Matrix.RotationQuaternion(Quaternion.RotationAxis(
                               new Vector3(device.Transform.View.M12,
                                           device.Transform.View.M22,
                                           device.Transform.View.M32),
                               angle)));
                       camPosition.X = tempV.X + camTarget.X;
                       camPosition.Y = tempV.Y + camTarget.Y;
                       camPosition.Z = tempV.Z + camTarget.Z;
                   }
                   break;
               case Keys.Right: //摄像机绕Y轴逆时针旋转
                   {
                       camPosition.Subtract(camTarget);
                       tempV = Vector3.Transform(
                           camPosition,
                           Matrix.RotationQuaternion(Quaternion.RotationAxis(
                               new Vector3(device.Transform.View.M12,
                                           device.Transform.View.M22,
                                           device.Transform.View.M32),
                               -angle)));
                       camPosition.X = tempV.X + camTarget.X;
                       camPosition.Y = tempV.Y + camTarget.Y;
                       camPosition.Z = tempV.Z + camTarget.Z;
                   }
                   break;
               case Keys.S:  //左平移
                   {
                       camPosition.Subtract(camTarget);
                       camTarget.X -= 1f;
                       camPosition.Add(camTarget);
                   }
                   break;
               case Keys.F: //右平移
                   {
                       camPosition.Subtract(camTarget);
                       camTarget.X += 1f;
                       camPosition.Add(camTarget);
                   }
                   break;
           }
 
           device.Transform.View = Matrix.LookAtLH(
               camPosition,
               camTarget,
               camUp);
 
           this.Invalidate();
       }
   }

效果：

image放大 image缩小image平移image俯仰image旋转

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原文地址：https://www.cnblogs.com/sharpfeng/p/1954085.html