three.js/docs/api/cameras/PerspectiveCamera.html

<h1>PerspectiveCamera &larr; [page:Camera] &larr; [page:Object3D]</h1>

<div>Camera with perspective projection.</div>

<h2>Example</h2>

<code>var camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );
scene.add( camera );
</code>

<h2>Constructor</h2>

<h3>PerspectiveCamera( fov [page:Number], aspect [page:Number], near [page:Number], far [page:Number] )</h3>


<h2>Properties</h2>

<h3>fov [page:Number]</h3>
<div>Camera frustum vertical field of view.</div>

<h3>aspect [page:Number]</h3>
<div>Camera frustum aspect ratio.</div>

<h3>near [page:Number]</h3>
<div>Camera frustum near plane.</div>

<h3>far [page:Number]</h3>
<div>Camera frustum far plane.</div>


<h2>Methods</h2>

<h3>setLens( focalLength [page:Number], frameSize [page:Number] )</h3>
<div>
Uses focal length (in mm) to estimate and set FOV 35mm (fullframe) camera is used if frame size is not specified.<br />
Formula based on <a href="http://www.bobatkins.com/photography/technical/field_of_view.html" target="_blank">http://www.bobatkins.com/photography/technical/field_of_view.html</a>
</div>

<h3>setViewOffset( fullWidth [page:Number], fullHeight [page:Number], x [page:Number], y [page:Number], width [page:Number], height [page:Number] )</h3>
<div>
Sets an offset in a larger frustum. This is useful for multi-window or multi-monitor/multi-machine setups.<br /><br />

For example, if you have 3x2 monitors and each monitor is 1920x1080 and the monitors are in grid like this:<br />

<pre>+---+---+---+
| A | B | C |
+---+---+---+
| D | E | F |
+---+---+---+
</pre>

then for each monitor you would call it like this:<br />

<code>var w = 1920;
var h = 1080;
var fullWidth = w * 3;
var fullHeight = h * 2;

// --A--
camera.setOffset( fullWidth, fullHeight, w * 0, h * 0, w, h );
//--B--
camera.setOffset( fullWidth, fullHeight, w * 1, h * 0, w, h );
//--C--
camera.setOffset( fullWidth, fullHeight, w * 2, h * 0, w, h );
//--D--
camera.setOffset( fullWidth, fullHeight, w * 0, h * 1, w, h );
//--E--
camera.setOffset( fullWidth, fullHeight, w * 1, h * 1, w, h );
//--F--
camera.setOffset( fullWidth, fullHeight, w * 2, h * 1, w, h );
</code>

Note there is no reason monitors have to be the same size or in a grid.
</div>

<h3>updateProjectionMatrix()</h3>
<div>
Updates camera's projection matrix. Must be called after change of parameters.
</div>

<h2>Source</h2>

<div><a href="https://github.com/mrdoob/three.js/blob/master/src/[path].js" target="_blank">src/[path].js</a></div>