世界空间而不是局部空间中的相机间距答案

【问题标题】：Camera pitch in worldspace and not localspace世界空间而不是局部空间中的相机间距
【发布时间】：2012-10-11 06:32:26
【问题描述】：

如何在本地空间中投放相机？

我有一个模型，无论它在世界空间中的哪个位置，它都会在其轴上旋转。我遇到的问题是让相机俯仰相同，而不管模型的其他旋转（偏航）。目前，如果模型在世界空间中面向北方或南方，则相机会相应地倾斜。但是当模型面对任何其他基本方向时，在尝试俯仰相机后，相机在模型后面以圆周运动上下移动（因为它只识别世界空间而不是模型面对的方向）。

如何让俯仰与模型一起旋转，以便无论模型面向哪个方向？当我尝试俯仰时，相机会在模型上方移动吗？

// Rotates model and pitches camera on its own axis
    public void modelRotMovement(GamePadState pController)
    {
        /* For rotating the model left or right.
         * Camera maintains distance from model
         * throughout rotation and if model moves 
         * to a new position.
         */

        Yaw = pController.ThumbSticks.Right.X * MathHelper.ToRadians(speedAngleMAX);

        AddRotation = Quaternion.CreateFromYawPitchRoll(Yaw, 0, 0);
        ModelLoad.MRotation *= AddRotation;
        MOrientation = Matrix.CreateFromQuaternion(ModelLoad.MRotation);

        /* Camera pitches vertically around the
         * model. Problem is that the pitch is
         * in worldspace and doesn't take into
         * account if the model is rotated.
         */
        Pitch = pController.ThumbSticks.Right.Y * MathHelper.ToRadians(speedAngleMAX);
    }

    // Orbit (yaw) Camera around model
    public void cameraYaw(Vector3 axisYaw, float yaw)
    {
        ModelLoad.CameraPos = Vector3.Transform(ModelLoad.CameraPos - ModelLoad.camTarget,
            Matrix.CreateFromAxisAngle(axisYaw, yaw)) + ModelLoad.camTarget;
    }

    // Pitch Camera around model
    public void cameraPitch(Vector3 axisPitch, float pitch)
    {
        ModelLoad.CameraPos = Vector3.Transform(ModelLoad.CameraPos - ModelLoad.camTarget,
            Matrix.CreateFromAxisAngle(axisPitch, pitch)) + ModelLoad.camTarget; 
    }

    public void updateCamera()
    {
        cameraPitch(Vector3.Right, Pitch);
        cameraYaw(Vector3.Up, Yaw);
    }

【问题讨论】：

标签： c# xna camera pitch

【解决方案1】：

>    public void cameraPitch(Vector3 axisPitch, float pitch)
>     {
>         ModelLoad.CameraPos = Vector3.Transform(ModelLoad.CameraPos - ModelLoad.camTarget,
>             Matrix.CreateFromAxisAngle(axisPitch, pitch)) + ModelLoad.camTarget; 
>     }

我应该在您的上一个问题中看到这一点。对不起。

axisPitch 确实是一个全局空间向量，它需要在局部空间中。这应该可以。

   public void cameraPitch(float pitch)
    {
        Vector3 f = ModelLoad.camTarget - ModelLoad.CameraPos;
        Vector3 axisPitch = Vector3.Cross(Vector3.Up, f);
        axisPitch.Normalize();
        ModelLoad.CameraPos = Vector3.Transform(ModelLoad.CameraPos - ModelLoad.camTarget,
            Matrix.CreateFromAxisAngle(axisPitch, pitch)) + ModelLoad.camTarget; 
    }

【讨论】：