Calculate camera zoom required for object to fit in screen height

Question

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         


        

Answer 1

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 );

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

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. :)