arviewer.js
14 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
arcs_module(
function(ARCS, three) {
var ARViewer;
/**
* @class ARViewer
* @classdesc Simple compositing viewer for augmented reality
*/
ARViewer = ARCS.Component.create(
/** @lends ARViewer.prototype */
function () {
var container, sourceAspectRatio, sourceHeight;
var renderer, scene2d, scene3d, camera2d, camera3d, videoSource, videoTexture;
var aspectRatioKept = true;
var sceneId;
// scenegraph initializations
scene2d = new THREE.Scene();
camera2d = new THREE.OrthographicCamera(-0.5, 0.5, 0.5, -0.5);
scene2d.add(camera2d);
scene3d = new THREE.Scene();
/**
* Initializes the widgets (HTML elements) needed as a basis
* for the viewer.
* @param cName {string} id of the container that will enclose the scene renderer
* @param vName {string} id of the element at the source of the video stream
* @slot
* @function ARViewer#setWidgets
*/
this.setWidgets = function(cName,vName) {
container = document.getElementById(cName);
videoSource = document.getElementById(vName);
var containerStyle = window.getComputedStyle(container);
var videoStyle = window.getComputedStyle(videoSource);
sourceAspectRatio = parseInt(videoStyle.width) / parseInt(videoStyle.height);
sourceHeight = parseInt(videoStyle.height);
container.width = parseInt(containerStyle.width);
container.height = parseInt(containerStyle.height);
renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0x000000, 1);
renderer.setSize(container.width, container.height);
container.appendChild(renderer.domElement);
var theta = 45; //2*Math.atan2(container.height/2,focalLength)*180/3.14159265;
camera3d = new THREE.PerspectiveCamera(theta, container.width / container.height, 0.01, 10000);
scene3d.add(camera3d);
var _light = new THREE.DirectionalLight(0xffffff);
_light.position.set(0,5,5);
scene3d.add(_light);
if ( THREE.VideoTexture !== undefined) {
console.log("Using video texture since it is available");
videoTexture = new THREE.VideoTexture(videoSource);
} else {
console.log("Falling back on simple texture");
videoTexture = new THREE.Texture(videoSource);
}
var geometry = new THREE.PlaneGeometry(1.0, 1.0, 0.0);
var material = new THREE.MeshBasicMaterial( {map: videoTexture, depthTest: false, depthWrite: false} );
var mesh = new THREE.Mesh(geometry, material);
var textureObject = new THREE.Object3D();
textureObject.position.z = -1;
textureObject.add(mesh);
scene2d.add(textureObject);
updateAspectRatio();
};
/**
* Set the focal length of the virtual camera for very simple
* camera models.
* @param focal {numeric} focal length (in pixels) of the camera.
* @slot
* @function ARViewer#setFocal
*/
this.setFocal = function (focal) {
var theta = 2*Math.atan(0.5*sourceHeight/focal)*180/Math.PI;
camera3d.fov = theta;
console.log(theta);
//camera3d.updateProjectionMatrix();
updateAspectRatio();
};
/**
* Set intrinsic camera parameters for the virtual camera
* @param intrinsics {array} linearized array of camera parameters
* @slot
* @function ARViewer#setIntrinsics
*/
this.setIntrinsics = function (parameters) {
/*3 set here the intrinsic parameters of camera3d
* camera3d should be of type THREE.FrustumCamera
* you should frustum accordingly to intrinsic parameters
*/
// camera3d = new THREE.FrustumCamera( ... ) ;
};
/**
* Set extrinsic camera parameters for the virtual camera
* @param markers {array} an array of markers
* @slot
* @function ARViewer#setExtrinsics
*/
this.setExtrinsics = function (markers) {
/*2 set here the extrinsic parameters of camera3d
* Each marker has 3 major properties :
* - id is the marker id;
* - pose.rotation gives its orientation using a rotation matrix
* and is a 3x3 array
* - pose.position gives its position with respect to the camera
* and is a vector with 3 components.
*/
var i ;
for ( i = 0; i < markers.length; i++) {
if ( markers[i].id === sceneId ) {
// put here the code to set orientation and position of object camera3d
// see also documentation of Object3D (API Three.js)
// since a camera is an Object3D
var rotation = markers[i].pose.rotation;
var translation = markers[i].pose.position;
var matrix = new THREE.Matrix4(
rotation[0][0], rotation[0][1], rotation[0][2], translation[0],
rotation[1][0], rotation[1][1], rotation[1][2], translation[1],
rotation[2][0], rotation[2][1], rotation[2][2], translation[2],
0 , 0, 0, 1);
/*var r = new THREE.Euler();
r.setFromRotationMatrix(matrix);
camera3d.rotation.x = r.x;
camera3d.rotation.y = r.y;
camera3d.rotation.z = r.z;*/
camera3d.position.x = translation[0];
camera3d.position.y = translation[1];
camera3d.position.z = translation[2];
/*objRoot.scale.x = 1;
objRoot.scale.y = 1;
objRoot.scale.z = 1;*/
}
}
};
/**
* Set the scene id in case we should set extrinsic parameters.
* @param id {number} the id of the scene
* @function ARViewer#setSceneId
* @slot
*/
this.setSceneId = function (id) {
sceneId = id;
};
/**
* Sets the size of the viewport in pixels to render the scene
* @param width {number} width of the viewport
* @param height {number} height of the viewport
* @slot
* @function ARViewer#setSize
*/
this.setSize = function(width, height) {
var W = width|0;
var H = height|0;
container.width = width;
container.height = height;
renderer.setSize(W,H);
updateAspectRatio();
};
/**
* Tells to keep the aspect ratio of the camera.
* It avoids deformations of the augmented scene.
* @param b {boolean} set it to <tt>true</tt> to keep aspect ratio, <tt>false</tt> otherwise
* @slot
* @function ARViewer#keepAspectRatio
*/
this.keepAspectRatio = function (b) {
aspectRatioKept = b;
};
var updateAspectRatio = function () {
var cAspectRatio = container.width / container.height;
var actualWidth, actualHeight;
var xoff, yoff;
if (aspectRatioKept == true) {
// cameras have the source aspect ratio
camera2d.aspect = sourceAspectRatio;
camera2d.updateProjectionMatrix();
camera3d.aspect = sourceAspectRatio;
camera3d.updateProjectionMatrix();
// then, we should adjust viewport accordingly.
if (cAspectRatio > sourceAspectRatio) {
actualHeight = container.height;
actualWidth = actualHeight * sourceAspectRatio;
} else {
actualWidth = container.width;
actualHeight = actualWidth / sourceAspectRatio;
}
xoff = (container.width - actualWidth) / 2 ;
yoff = (container.height - actualHeight) / 2;
renderer.setViewport(xoff, yoff, actualWidth, actualHeight);
} else {
// for 3D camera, we will have to recompute the actual
// aspect ratio.
// but first reset viewport, just in case
renderer.setViewport(0, 0, container.width, container.height);
camera2d.aspect = cAspectRatio ;
camera2d.updateProjectionMatrix();
camera3d.aspect = sourceAspectRatio;
camera3d.updateProjectionMatrix();
console.log(camera3d.projectionMatrix);
}
};
/**
* Adds new objects to the current 3D scene
* @param scene {object} 3D object as defined by Three.js to add to the scene.
* @slot
* @function ARViewer#addScene
*/
this.addScene = function (scene) {
scene3d.add(scene);
};
/**
* Removes an object from the current 3D scene
* @param scene {object} 3D object as defined by Three.js to remove from the scene.
* @slot
* @function ARViewer#removeScene
*/
this.removeScene = function (scene) {
scene3d.remove(scene);
};
/**
* Triggers the rendering of the composite scene
* @function ARViewer#render
* @slot
*/
this.render = function () {
videoTexture.needsUpdate = true;
renderer.autoClear = false;
renderer.clear();
renderer.render(scene2d, camera2d);
renderer.render(scene3d, camera3d);
};
/**
* Computes the ideal camera position to see the whole 3D scene.
* Mainly useful for debugging
* @function ARViewer#viewAll
* @slot
*/
this.viewAll = function () {
var box = new THREE.Box3();
box.setFromObject(scene3d);
var center = box.center();
var radius = box.getBoundingSphere().radius;
camera3d.position.x = center.x ;
camera3d.position.y = center.y ;
var c = Math.cos(camera3d.fov/2);
var s = Math.sin(camera3d.fov/2);
camera3d.position.z = center.z + 1.2 * radius*s*( 1 + s / c ) ;
};
/**
* Resets the position of the camera to the origin of the scene coordinate system
* @slot
* @function ARViewer#resetCamera
*/
this.resetCamera = function () {
camera3d.position.x = camera3d.position.y = camera3d.position.z = 0;
camera3d.up = THREE.Object3D.DefaultUp.clone();
}
},
/** @lends ARViewer.slots */
['setWidgets','setFocal','viewAll','setSize','addScene','resetCamera','removeScene','render','keepAspectRatio'],
[]
);
return {ARViewer: ARViewer};
},
[ 'deps/three.js/index','deps/three.js/frustumcamera']
);