Question

我正在为3D游戏制作相机。相机由以下变量组成：

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

默认情况下，'cameraLookAt'位于（0,0,0），'cameraPosition'位于（0,0,10），这意味着相机位于'cameraLookAt'位置正上方，可以看到下面的对象（红绿色和蓝色xyz平面测试对象）

'cameraLookAt'可沿x轴和y轴移动，然后相对于'cameraLookAt'位置以及'cameraPitch'和'cameraRotation'的当前值计算'cameraPosition'

目前，您可以精确地移动x / y轴，并将相机的间距更改为从birdeye视图到地面视图。我遇到的麻烦就是让相机旋转起作用。

当旋转值改变时，它只有在音高改变时才有效 - 从程序启动时的默认值开始（直接向下看'cameraLookAt'）

当值发生变化时，您可以围绕Z轴旋转，但视图也会滚动，所以当您旋转180度时，相机也会旋转180度并且您的视图上下颠倒。

下面是“cameraPosition”所在的代码，我确定这些行中的修正行。

        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);

此外，还有一个q＆amp; a，我发现它可以帮我编写代码XNA Rotate Camera Around It's CreateLookAt "Target"

Answer 1

应在不改变其长度的情况下旋转偏移，然后将其添加到摄像机位置。

我认为应该是这样的：

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

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

   cameraPosition = cameraLookAt + rotatedOffset;

XNA相机绕Z轴旋转

1 个答案: