99 lines
2.4 KiB
JavaScript
99 lines
2.4 KiB
JavaScript
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import { Matrix4 } from '../math/Matrix4.js';
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import { _Math } from '../math/Math.js';
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import { PerspectiveCamera } from './PerspectiveCamera.js';
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/**
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* @author mrdoob / http://mrdoob.com/
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*/
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function StereoCamera() {
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this.type = 'StereoCamera';
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this.aspect = 1;
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this.eyeSep = 0.064;
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this.cameraL = new PerspectiveCamera();
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this.cameraL.layers.enable( 1 );
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this.cameraL.matrixAutoUpdate = false;
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this.cameraR = new PerspectiveCamera();
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this.cameraR.layers.enable( 2 );
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this.cameraR.matrixAutoUpdate = false;
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}
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Object.assign( StereoCamera.prototype, {
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update: ( function () {
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var instance, focus, fov, aspect, near, far, zoom, eyeSep;
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var eyeRight = new Matrix4();
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var eyeLeft = new Matrix4();
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return function update( camera ) {
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var needsUpdate = instance !== this || focus !== camera.focus || fov !== camera.fov ||
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aspect !== camera.aspect * this.aspect || near !== camera.near ||
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far !== camera.far || zoom !== camera.zoom || eyeSep !== this.eyeSep;
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if ( needsUpdate ) {
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instance = this;
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focus = camera.focus;
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fov = camera.fov;
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aspect = camera.aspect * this.aspect;
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near = camera.near;
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far = camera.far;
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zoom = camera.zoom;
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// Off-axis stereoscopic effect based on
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// http://paulbourke.net/stereographics/stereorender/
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var projectionMatrix = camera.projectionMatrix.clone();
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eyeSep = this.eyeSep / 2;
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var eyeSepOnProjection = eyeSep * near / focus;
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var ymax = ( near * Math.tan( _Math.DEG2RAD * fov * 0.5 ) ) / zoom;
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var xmin, xmax;
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// translate xOffset
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eyeLeft.elements[ 12 ] = - eyeSep;
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eyeRight.elements[ 12 ] = eyeSep;
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// for left eye
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xmin = - ymax * aspect + eyeSepOnProjection;
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xmax = ymax * aspect + eyeSepOnProjection;
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projectionMatrix.elements[ 0 ] = 2 * near / ( xmax - xmin );
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projectionMatrix.elements[ 8 ] = ( xmax + xmin ) / ( xmax - xmin );
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this.cameraL.projectionMatrix.copy( projectionMatrix );
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// for right eye
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xmin = - ymax * aspect - eyeSepOnProjection;
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xmax = ymax * aspect - eyeSepOnProjection;
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projectionMatrix.elements[ 0 ] = 2 * near / ( xmax - xmin );
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projectionMatrix.elements[ 8 ] = ( xmax + xmin ) / ( xmax - xmin );
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this.cameraR.projectionMatrix.copy( projectionMatrix );
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}
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this.cameraL.matrixWorld.copy( camera.matrixWorld ).multiply( eyeLeft );
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this.cameraR.matrixWorld.copy( camera.matrixWorld ).multiply( eyeRight );
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};
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} )()
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} );
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export { StereoCamera };
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