Doodle3D-Slicer/three.js-master/examples/js/cameras/CombinedCamera.js
2015-06-12 15:58:26 +02:00

238 lines
5.0 KiB
JavaScript
Executable File

/**
* @author zz85 / http://twitter.com/blurspline / http://www.lab4games.net/zz85/blog
*
* A general perpose camera, for setting FOV, Lens Focal Length,
* and switching between perspective and orthographic views easily.
* Use this only if you do not wish to manage
* both a Orthographic and Perspective Camera
*
*/
THREE.CombinedCamera = function ( width, height, fov, near, far, orthoNear, orthoFar ) {
THREE.Camera.call( this );
this.fov = fov;
this.left = -width / 2;
this.right = width / 2
this.top = height / 2;
this.bottom = -height / 2;
// We could also handle the projectionMatrix internally, but just wanted to test nested camera objects
this.cameraO = new THREE.OrthographicCamera( width / - 2, width / 2, height / 2, height / - 2, orthoNear, orthoFar );
this.cameraP = new THREE.PerspectiveCamera( fov, width / height, near, far );
this.zoom = 1;
this.toPerspective();
var aspect = width / height;
};
THREE.CombinedCamera.prototype = Object.create( THREE.Camera.prototype );
THREE.CombinedCamera.prototype.constructor = THREE.CombinedCamera;
THREE.CombinedCamera.prototype.toPerspective = function () {
// Switches to the Perspective Camera
this.near = this.cameraP.near;
this.far = this.cameraP.far;
this.cameraP.fov = this.fov / this.zoom ;
this.cameraP.updateProjectionMatrix();
this.projectionMatrix = this.cameraP.projectionMatrix;
this.inPerspectiveMode = true;
this.inOrthographicMode = false;
};
THREE.CombinedCamera.prototype.toOrthographic = function () {
// Switches to the Orthographic camera estimating viewport from Perspective
var fov = this.fov;
var aspect = this.cameraP.aspect;
var near = this.cameraP.near;
var far = this.cameraP.far;
// The size that we set is the mid plane of the viewing frustum
var hyperfocus = ( near + far ) / 2;
var halfHeight = Math.tan( fov * Math.PI / 180 / 2 ) * hyperfocus;
var planeHeight = 2 * halfHeight;
var planeWidth = planeHeight * aspect;
var halfWidth = planeWidth / 2;
halfHeight /= this.zoom;
halfWidth /= this.zoom;
this.cameraO.left = -halfWidth;
this.cameraO.right = halfWidth;
this.cameraO.top = halfHeight;
this.cameraO.bottom = -halfHeight;
// this.cameraO.left = -farHalfWidth;
// this.cameraO.right = farHalfWidth;
// this.cameraO.top = farHalfHeight;
// this.cameraO.bottom = -farHalfHeight;
// this.cameraO.left = this.left / this.zoom;
// this.cameraO.right = this.right / this.zoom;
// this.cameraO.top = this.top / this.zoom;
// this.cameraO.bottom = this.bottom / this.zoom;
this.cameraO.updateProjectionMatrix();
this.near = this.cameraO.near;
this.far = this.cameraO.far;
this.projectionMatrix = this.cameraO.projectionMatrix;
this.inPerspectiveMode = false;
this.inOrthographicMode = true;
};
THREE.CombinedCamera.prototype.setSize = function( width, height ) {
this.cameraP.aspect = width / height;
this.left = -width / 2;
this.right = width / 2
this.top = height / 2;
this.bottom = -height / 2;
};
THREE.CombinedCamera.prototype.setFov = function( fov ) {
this.fov = fov;
if ( this.inPerspectiveMode ) {
this.toPerspective();
} else {
this.toOrthographic();
}
};
// For mantaining similar API with PerspectiveCamera
THREE.CombinedCamera.prototype.updateProjectionMatrix = function() {
if ( this.inPerspectiveMode ) {
this.toPerspective();
} else {
this.toPerspective();
this.toOrthographic();
}
};
/*
* Uses Focal Length (in mm) to estimate and set FOV
* 35mm (fullframe) camera is used if frame size is not specified;
* Formula based on http://www.bobatkins.com/photography/technical/field_of_view.html
*/
THREE.CombinedCamera.prototype.setLens = function ( focalLength, frameHeight ) {
if ( frameHeight === undefined ) frameHeight = 24;
var fov = 2 * THREE.Math.radToDeg( Math.atan( frameHeight / ( focalLength * 2 ) ) );
this.setFov( fov );
return fov;
};
THREE.CombinedCamera.prototype.setZoom = function( zoom ) {
this.zoom = zoom;
if ( this.inPerspectiveMode ) {
this.toPerspective();
} else {
this.toOrthographic();
}
};
THREE.CombinedCamera.prototype.toFrontView = function() {
this.rotation.x = 0;
this.rotation.y = 0;
this.rotation.z = 0;
// should we be modifing the matrix instead?
this.rotationAutoUpdate = false;
};
THREE.CombinedCamera.prototype.toBackView = function() {
this.rotation.x = 0;
this.rotation.y = Math.PI;
this.rotation.z = 0;
this.rotationAutoUpdate = false;
};
THREE.CombinedCamera.prototype.toLeftView = function() {
this.rotation.x = 0;
this.rotation.y = - Math.PI / 2;
this.rotation.z = 0;
this.rotationAutoUpdate = false;
};
THREE.CombinedCamera.prototype.toRightView = function() {
this.rotation.x = 0;
this.rotation.y = Math.PI / 2;
this.rotation.z = 0;
this.rotationAutoUpdate = false;
};
THREE.CombinedCamera.prototype.toTopView = function() {
this.rotation.x = - Math.PI / 2;
this.rotation.y = 0;
this.rotation.z = 0;
this.rotationAutoUpdate = false;
};
THREE.CombinedCamera.prototype.toBottomView = function() {
this.rotation.x = Math.PI / 2;
this.rotation.y = 0;
this.rotation.z = 0;
this.rotationAutoUpdate = false;
};