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

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

<div class="desc">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>[name]( [page:Number fov], [page:Number aspect], [page:Number near], [page:Number far] )</h3>
<div>
fov — camera frustum vertical field of view.<br />
aspect — camera frustum aspect ratio.<br />
near — camera frustum near plane.<br />
far — camera frustum far plane.
</div>


<h2>Properties</h2>

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

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

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

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


<h2>Methods</h2>

<h3>.setLens( [page:Number focalLength], [page:Number frameSize] )</h3>
<div>
focalLength — focal length<br />
frameSize — frame size
</div>

<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( [page:Number fullWidth], [page:Number fullHeight], [page:Number x], [page:Number y], [page:Number width], [page:Number height] )</h3>
<div>
fullWidth — full width of multiview setup<br />
fullHeight — full height of multiview setup<br />
x — horizontal offset of subcamera<br />
y — vertical offset of subcamera<br />
width — width of subcamera<br />
height — height of subcamera
</div>

<div>
Sets an offset in a larger frustum. This is useful for multi-window or multi-monitor/multi-machine setups.
</div>

<div>
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.setViewOffset( fullWidth, fullHeight, w * 0, h * 0, w, h );
// B
camera.setViewOffset( fullWidth, fullHeight, w * 1, h * 0, w, h );
// C
camera.setViewOffset( fullWidth, fullHeight, w * 2, h * 0, w, h );
// D
camera.setViewOffset( fullWidth, fullHeight, w * 0, h * 1, w, h );
// E
camera.setViewOffset( fullWidth, fullHeight, w * 1, h * 1, w, h );
// F
camera.setViewOffset( 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 the camera 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>