计算物体适合屏幕高度所需的相机缩放 [英] Calculate camera zoom required for object to fit in screen height

问题描述

在 Three.js 中，我使用这个公式来计算可见宽度 &高度

In Three.js I'm using this formulas to calculate visible width & height

var vFOV = camera.fov * Math.PI / 180;        // convert vertical fov to radians
var height = 2 * Math.tan( vFOV / 2 ) * dist; // visible height

var aspect = window.width / window.height;
var width = height * aspect;                  // visible width

然后我计算了对象所需的相机变焦，以使其完全适合渲染区域的宽度

And with that I calculate the camera zoom required for object to fit exactly into render area by WIDTH

var zoom = (ObjectHeight/aspect) / (2*Math.tan(vFOV/2)) + ObjectDepth;

我如何计算对象需要的相机变焦以完全符合 HEIGHT 的渲染区域?

How do I calculate the camera zoom required for object to fit exactly into render area by HEIGHT?

感谢 GuyGood，我找到了解决方案:

Thanks to GuyGood, I found the solution:

var zoom = (ObjectHeight/2) / Math.tan(vFOV/2) - ObjectDepth;

推荐答案

我正在执行以下基于 boundingSphere 半径的操作:

I am doing the following which is based on the boundingSphere radius:

geometry.computeBoundingSphere();
radius = geometry.boundingSphere.radius;
distanceFactor = Math.abs( aspect * radius / Math.sin( fov/2 );

这是基于这里的东西，我希望我能以正确的方式解释它:http://www.flipcode.com/forums/thread/4172

This is based on this stuff right here and I hope i interpreted it the right way: http://www.flipcode.com/forums/thread/4172

这个 distanceFactor 是你需要沿着它的观察方向移动相机以正确适应它的因素.目前我不确定它是按高度还是宽度，但也许它可以帮助您弄清楚.:)

This distanceFactor is the factor you need to move the camera along its viewing direction to fit it correctly. At the moment i am not sure if it is by height or width but maybe it helps you figure it out. :)

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