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-////////////////////////////////////////////////////////////////////////
-//
-// This JavaScript file is a simple concatenation of the files
-// `lights.js' and `turntable.js' from the `doc/javascript' directory.
-//
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-//
-// lights.js
-//
-// example JavaScript for use with `3Djscript' option of \includemovie
-//
-// * Adds light sources around the object for better illumination.
-//
-////////////////////////////////////////////////////////////////////////
-
-//first remove any scene lights
-for (var i = scene.lights.count - 1; i >= 0; i--) {
- scene.lights.removeByIndex(i);
-}
-
-//new lights
-//from left
-l1 = scene.createLight();
-l1.color.set(1,1,1);
-l1.brightness = .4;
-l1.direction.set(1,0,0);
-
-//from right
-l2 = scene.createLight();
-l2.color.set(1,1,1);
-l2.brightness = .4;
-l2.direction.set(-1,0,0);
-
-//from bottom
-l3 = scene.createLight();
-l3.color.set(1,1,1);
-l3.brightness = .4;
-l3.direction.set(0,0,1);
-
-//from top
-l4 = scene.createLight();
-l4.color.set(1,1,1);
-l4.brightness = .4;
-l4.direction.set(0,0,-1);
-
-//from front
-l5 = scene.createLight();
-l5.color.set(1,1,1);
-l5.brightness = .4;
-l5.direction.set(0,1,0);
-
-//from back
-l6 = scene.createLight();
-l6.color.set(1,1,1);
-l6.brightness = .4;
-l6.direction.set(0,-1,0);
-
-/////////////////////////////////////////////////////////////////////
-//
-// turntable.js
-//
-// JavaScript for use with `3Djscript' option of \includemovie
-//
-// * Greatly improves the rotational behaviour of the 3D object,
-// prevents it from tilting to the side while dragging the mouse.
-// This is achieved by suppressing the rolling of the camera about
-// its optical axis.
-//
-/////////////////////////////////////////////////////////////////////
-
-// maximum pitch (degrees from horizontal) of the camera
-var max_alpha = 88;
-var min_beta = 90 - max_alpha; // the complement
-var cos_min_beta = Math.cos(min_beta * Math.PI/180);
-var tan_min_beta = Math.tan(min_beta * Math.PI/180);
-
-var camera = scene.cameras.getByIndex(0);
-
-//updates the vertical axis of rotation whenever a predefined view
-//is selected from the drop down list in the 3D toolbar
-var cameraEventHandler = new CameraEventHandler();
-cameraEventHandler.onEvent = function (e) {
- camera.axis_up = camera.up.subtract(camera.position);
- camera.axis_up.normalize();
-}
-runtime.addEventHandler(cameraEventHandler);
-
-//suppresses camera rolling and limits camera pitch
-var mouseEventHandler = new MouseEventHandler();
-mouseEventHandler.onMouseMove = true;
-mouseEventHandler.onEvent = function (e) {
- var c2c = camera.position.subtract(camera.targetPosition);
- var roo = c2c.length;
- c2c.normalize();
- cos_beta = c2c.dot(camera.axis_up); //cos of enclosed angle
-
- //correct the camera position if it is too high or too low
- if(Math.abs(cos_beta) > cos_min_beta) {
- //auxiliary vectors a & b
- var a = camera.axis_up.scale(cos_beta);
- var b = c2c.subtract(a);
- b.normalize();
- b.scaleInPlace(tan_min_beta * a.length);
-
- c2c.set(a.add(b));
- c2c.normalize();
-
- camera.position.set(camera.targetPosition.add(c2c.scale(roo)));
- cos_beta = c2c.dot(camera.axis_up);
- }
-
- //suppress rolling
- camera.up.set(
- camera.position.add(camera.axis_up).add(c2c.scale(-cos_beta))
- );
-};
-runtime.addEventHandler(mouseEventHandler);