WPF使用Viewport3D投影摄像机，显示对象原始大小

[desperaso]

找了很多例子，FieldOfView如何设置才能显示对象原始大小，baidu没找到，
google找到了，记录一下。给大家省点事
初中数学都忘光了

viewport3D = new Viewport3D();
        viewport3D.Width = 控件宽度*2;

        PerspectiveCamera perspectiveCamera = new PerspectiveCamera()
        {
            LookDirection = new Vector3D(0, 0, -1),
            NearPlaneDistance = 100,
        };
        //FieldOfView 默认为45度
        double fieldOfViewInRadians = perspectiveCamera.FieldOfView * (Math.PI / 180.0);
        var z = (0.5 * viewport3D.Width) / Math.Tan(0.5 * fieldOfViewInRadians);
        perspectiveCamera.Position = new Point3D(0.0, 0.0, z);

[郑州高新区WPF小王子]

https://github.com/LXX1029/CodeRecord 分享自己写代码记录工具。