XNA相機繞着Z軸

Question

我創建一個3D遊戲的攝像機。相機由以下變量：

static Vector3 cameraLookAt = new Vector3(0, 0, 0); 
static Vector3 cameraPosition; 
static float cameraZoom = 25; // Field of view 
const int cameraZoomNear = 3; // The furthest the camera can zoom in 
const int cameraZoomFar = 45; // The furthest the camera can zoom out 
static float cameraPitch; // Amount to change the pitch 
static float cameraRotation; // Amount to change the rotation 

默認情況下， 'cameraLookAt' 是在（0，0，0）， 'cameraPosition' 是在（0,0，10）這意味着相機直接位於'cameraLookAt'位置上方，可以鳥瞰下方的物體（紅色綠色&藍色xyz平面測試對象）

'cameraLookAt'可以沿x和y軸移動，'cameraPosition'是然後相對於「cameraLookAt」位置和「cameraPitch」和「cameraRotation」

目前可以米的電流值來計算繞x/y軸的細OVE和改變相機的間距從birdeye視圖到接地視圖去。我遇到的問題是讓相機旋轉工作。

當旋轉值改變它只有當間距已經改變任何影響 - 在程序啓動時（這是尋找直接倒在「cameraLookAt」）

從默認的當值不會改變你可以繞Z軸旋轉，但認爲還你180度旋轉攝像頭已經推出180度以及時間推出如此，你的觀點是顛倒的。

下面是一個工作在哪裏的「cameraPosition」是我敢肯定，這些行內的修復行的代碼。

 cameraPosition = cameraLookAt + new Vector3(0, 0, 10); 

     Vector3 temp = Vector3.Normalize(cameraPosition - cameraLookAt); //creates a unit length vector that points in the direction from 'lookAt' to 'position' 
     cameraPosition = Vector3.Transform(cameraPosition - cameraLookAt, Matrix.CreateRotationX(cameraPitch)) + cameraLookAt; 
     cameraPosition = Vector3.Transform(cameraPosition - cameraLookAt, Matrix.CreateRotationZ(cameraRotation)) + cameraLookAt; 

     view = Matrix.CreateLookAt(cameraPosition, cameraLookAt, new Vector3(0.0f, 1.0f, 0.0f)); 
     projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(cameraZoom), graphics.GraphicsDevice.Viewport.AspectRatio, nearClip, farClip); 

而且，這裏是問答&一個，我發現幫我擺在首位XNA Rotate Camera Around It's CreateLookAt "Target"

Answer 1

偏移量應該不改變其長度旋轉，然後被添加到相機位置代碼它。

我想應該是這樣的：

offset = new Vector3(0, 0, 10); 

    Vector3 rotatedOffset = Vector3.Transform(offset, 
             Matrix.CreateRotationX(cameraPitch) 
             * Matrix.CreateRotationZ(cameraRotation)); 

    cameraPosition = cameraLookAt + rotatedOffset;