1 /**
  2  * @author mrdoob / http://mrdoob.com/
  3  * @author greggman / http://games.greggman.com/
  4  * @author zz85 / http://www.lab4games.net/zz85/blog
  5  */
  6 
  7 /**@constructor*/
  8 THREE.PerspectiveCamera = function ( fov, aspect, near, far ) {
  9 
 10 	THREE.Camera.call( this );
 11 
 12 	this.fov = fov !== undefined ? fov : 50;
 13 	this.aspect = aspect !== undefined ? aspect : 1;
 14 	this.near = near !== undefined ? near : 0.1;
 15 	this.far = far !== undefined ? far : 2000;
 16 
 17 	this.updateProjectionMatrix();
 18 
 19 };
 20 
 21 THREE.PerspectiveCamera.prototype = Object.create( THREE.Camera.prototype );
 22 
 23 
 24 /**
 25  * Uses Focal Length (in mm) to estimate and set FOV
 26  * 35mm (fullframe) camera is used if frame size is not specified;
 27  * Formula based on http://www.bobatkins.com/photography/technical/field_of_view.html
 28  */
 29 
 30 THREE.PerspectiveCamera.prototype.setLens = function ( focalLength, frameHeight ) {
 31 
 32 	if ( frameHeight === undefined ) frameHeight = 24;
 33 
 34 	this.fov = 2 * Math.atan( frameHeight / ( focalLength * 2 ) ) * ( 180 / Math.PI );
 35 	this.updateProjectionMatrix();
 36 
 37 }
 38 
 39 
 40 /**
 41  * Sets an offset in a larger frustum. This is useful for multi-window or
 42  * multi-monitor/multi-machine setups.
 43  *
 44  * For example, if you have 3x2 monitors and each monitor is 1920x1080 and
 45  * the monitors are in grid like this
 46  *
 47  *   +---+---+---+
 48  *   | A | B | C |
 49  *   +---+---+---+
 50  *   | D | E | F |
 51  *   +---+---+---+
 52  *
 53  * then for each monitor you would call it like this
 54  *
 55  *   var w = 1920;
 56  *   var h = 1080;
 57  *   var fullWidth = w * 3;
 58  *   var fullHeight = h * 2;
 59  *
 60  *   --A--
 61  *   camera.setOffset( fullWidth, fullHeight, w * 0, h * 0, w, h );
 62  *   --B--
 63  *   camera.setOffset( fullWidth, fullHeight, w * 1, h * 0, w, h );
 64  *   --C--
 65  *   camera.setOffset( fullWidth, fullHeight, w * 2, h * 0, w, h );
 66  *   --D--
 67  *   camera.setOffset( fullWidth, fullHeight, w * 0, h * 1, w, h );
 68  *   --E--
 69  *   camera.setOffset( fullWidth, fullHeight, w * 1, h * 1, w, h );
 70  *   --F--
 71  *   camera.setOffset( fullWidth, fullHeight, w * 2, h * 1, w, h );
 72  *
 73  *   Note there is no reason monitors have to be the same size or in a grid.
 74  */
 75 
 76 THREE.PerspectiveCamera.prototype.setViewOffset = function ( fullWidth, fullHeight, x, y, width, height ) {
 77 
 78 	this.fullWidth = fullWidth;
 79 	this.fullHeight = fullHeight;
 80 	this.x = x;
 81 	this.y = y;
 82 	this.width = width;
 83 	this.height = height;
 84 
 85 	this.updateProjectionMatrix();
 86 
 87 };
 88 
 89 
 90 THREE.PerspectiveCamera.prototype.updateProjectionMatrix = function () {
 91 
 92 	if ( this.fullWidth ) {
 93 
 94 		var aspect = this.fullWidth / this.fullHeight;
 95 		var top = Math.tan( this.fov * Math.PI / 360 ) * this.near;
 96 		var bottom = -top;
 97 		var left = aspect * bottom;
 98 		var right = aspect * top;
 99 		var width = Math.abs( right - left );
100 		var height = Math.abs( top - bottom );
101 
102 		this.projectionMatrix.makeFrustum(
103 			left + this.x * width / this.fullWidth,
104 			left + ( this.x + this.width ) * width / this.fullWidth,
105 			top - ( this.y + this.height ) * height / this.fullHeight,
106 			top - this.y * height / this.fullHeight,
107 			this.near,
108 			this.far
109 		);
110 
111 	} else {
112 
113 		this.projectionMatrix.makePerspective( this.fov, this.aspect, this.near, this.far );
114 
115 	}
116 
117 };
118 

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