XNA C＃用3D模型创建等轴测视图

Question

我正在尝试制作一个简单的等距游戏引擎，但是有一些相机问题。当我拥有它时，我可以从前面看到我的模型。但我想从等轴测角度看它。我尝试了很多方法，但似乎没有任何工作。也许我陷入了代码本身？你们可以帮我解码吗？

public class Camera : PositionedObject 
{ 

    #region Fields 
    private Matrix cameraRotation; 

    #endregion 


    #region Properties 
    public Matrix View 
    { 
     get; 
     set; 
    } 

    public Matrix Projection 
    { 
     get; 
     protected set; 
    } 

    public Vector3 Target 
    { 
     get; 
     set; 
    } 
    #endregion 

    #region Constructor 
    public Camera(Game game, Vector3 position, Vector3 target, Vector3 rotation, bool Orthographic, float near, float far) 
     : base(game) 
    {  
     Position = position; 
     RotationInRadians = rotation; 
     Target = target; 


     if (Orthographic) 
     { 
      Projection = Matrix.CreateOrthographic(Game.Window.ClientBounds.Width, Game.Window.ClientBounds.Height, 
       near, far); 
     } 
     else 
     { 
      Projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4, 
       (float)Game.Window.ClientBounds.Width/(float)Game.Window.ClientBounds.Height, near, far); 
     } 




    } 
    #endregion 

    #region Public Methods 

    public override void Initialize() 
    { 
     base.Initialize(); 
     cameraRotation = Matrix.Identity; 

    } 



    public override void Update(GameTime gameTime) 
    { 
     base.Update(gameTime); 

     cameraRotation = Matrix.CreateFromAxisAngle(cameraRotation.Forward, RotationInRadians.Z) 
      * Matrix.CreateFromAxisAngle(cameraRotation.Right, RotationInRadians.X) 
      * Matrix.CreateFromAxisAngle(cameraRotation.Up, RotationInRadians.Y); 

     Target = Position + cameraRotation.Forward; 
     View = Matrix.CreateLookAt(Position, Target, cameraRotation.Up); 
    } 

    public void Draw(BasicEffect effect) 
    { 
     effect.View = View; 
     effect.Projection = Projection; 
    } 
    #endregion 
} 

Answer 1

最简单的方法是根据焦点（地面上的一点，或其他）计算相机位置。

//Lets start with looking at origo for now. 
Vector3 FocusPoint = Vector3.Zero; 

//This tells us where the camera should be, RELATIVE to the point we are watching. 
//I set this a little up and a little back 
Vector3 CameraOffset = new Vector3(0f, 20f, 20f); 

Matrix ViewMatrix 
{ 
    get 
    { 
     //The Offset is just up and back, we need to rotate it 45* 
     var rotatedOffste = Vector3.Transform(CameraOffset, Matrix.CreateRotationY(MathHelper.PiOverTwo * 0.5f)); 

     //Now we can create out viewmatrix. No need to use a transformed "up" unless it's not going to be upside down or something. 
     return Matrix.CreateLookAt(rotatedOffset, FocusPoint, Vector3.Up); 
    } 

}