Javascript 如何将正交摄影机转换为透视和反向？

我正在使用combinedcamera.js和orbitcontrols.js

我有它的工作，以便相机可以切换，都可以放大和缩小。 但是，orbitcontrols会重新定位透视摄影机以模拟缩放，而正交摄影机不会这样做（它会更改fov等）

这最终会导致摄影机远平截头体平面在透视模式下移动（我希望如此），而它不会在正交模式下移动（我希望它移动）

我已经解决了这个问题，通过重新定位透视和正交摄影机。正交摄影机不使用其位置来确定缩放，因此存在问题

问题是，当我在相机之间切换时，它们似乎没有相同的缩放量

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我想问题是，如何让正交摄影机依靠摄影机位置来确定缩放量，使其看起来始终具有与透视摄影机相似的缩放效果？

好吧，在进行了大量实验后，我找到了一种非常简单的方法来获得足够接近的结果。 我意外地发现，如果将“远视锥”值设置为25，它将工作得非常完美。。所以我做了一个等式来补偿，如果值不同。这已经足够近了，但也许有人能看到哪里可以改进

我在combinedcamera.js中替换了

halfHeight /= this.zoom;
halfWidth /= this.zoom;

与

我在combinedcamera.js中添加了这一行

this.cameraO.far = this.cameraP.far+((this.cameraP.far/25)*this.zoom)-0.5;

就在这之前

this.cameraO.updateProjectionMatrix();

这是完整的部分

 THREE.CombinedCamera.prototype.toOrthographic = function () {

// Switches to the Orthographic camera estimating viewport from Perspective

var fov = this.fov;
var aspect = this.cameraP.aspect;
var near = this.cameraP.near;
var far = this.cameraP.far;

// The size that we set is the mid plane of the viewing frustum

var hyperfocus = ( near + far ) / 2;

var halfHeight = Math.tan( fov * Math.PI / 180 / 2 ) * hyperfocus;
var planeHeight = 2 * halfHeight;
var planeWidth = planeHeight * aspect;
var halfWidth = planeWidth / 2;

halfHeight /= ((this.cameraP.far/25)*this.zoom);
halfWidth /= ((this.cameraP.far/25)*this.zoom);

this.cameraO.left = -halfWidth;
this.cameraO.right = halfWidth;
this.cameraO.top = halfHeight;
this.cameraO.bottom = -halfHeight;

// this.cameraO.left = -farHalfWidth;
// this.cameraO.right = farHalfWidth;
// this.cameraO.top = farHalfHeight;
// this.cameraO.bottom = -farHalfHeight;

// this.cameraO.left = this.left / this.zoom;
// this.cameraO.right = this.right / this.zoom;
// this.cameraO.top = this.top / this.zoom;
// this.cameraO.bottom = this.bottom / this.zoom;

this.cameraO.far = this.cameraP.far+((this.cameraP.far/25)*this.zoom)-0.5;
this.cameraO.updateProjectionMatrix();

this.near = this.cameraO.near;
this.far = this.cameraO.far;
this.projectionMatrix = this.cameraO.projectionMatrix;

this.inPerspectiveMode = false;
this.inOrthographicMode = true;

 };

我还将透视摄影机的this.zoom更改为仅1

 THREE.CombinedCamera.prototype.toPerspective = function () {

// Switches to the Perspective Camera

this.near = this.cameraP.near;
this.far = this.cameraP.far;

this.cameraP.fov =  this.fov / 1 ;

this.cameraP.updateProjectionMatrix();

this.projectionMatrix = this.cameraP.projectionMatrix;

this.inPerspectiveMode = true;
this.inOrthographicMode = false;

 };

此外，我还必须调整轨道控制装置

this.dollyIn = function ( dollyScale ) {

    if ( dollyScale === undefined ) {

        dollyScale = getZoomScale();

    }

        scale /= dollyScale;
        scope.object.zoom = Math.max( this.minZoom, Math.min( this.maxZoom, this.object.zoom * dollyScale ) );
};

this.dollyOut = function ( dollyScale ) {

    if ( dollyScale === undefined ) {

        dollyScale = getZoomScale();

    }

        scale *= dollyScale;
        scope.object.zoom = Math.max( this.minZoom, Math.min( this.maxZoom, this.object.zoom / dollyScale ) );
};

this.dollyIn = function ( dollyScale ) {

    if ( dollyScale === undefined ) {

        dollyScale = getZoomScale();

    }

        scale /= dollyScale;
        scope.object.zoom = Math.max( this.minZoom, Math.min( this.maxZoom, this.object.zoom * dollyScale ) );
};

this.dollyOut = function ( dollyScale ) {

    if ( dollyScale === undefined ) {

        dollyScale = getZoomScale();

    }

        scale *= dollyScale;
        scope.object.zoom = Math.max( this.minZoom, Math.min( this.maxZoom, this.object.zoom / dollyScale ) );
};