~holger-seelig/cobweb.js/1.4
» Revision
244
: cobweb.js/cobweb/Components/ParticleSystems/SurfaceEmitter.js
« back to all changes in this revision
Viewing changes to cobweb.js/cobweb/Components/ParticleSystems/SurfaceEmitter.js
- browse files at revision 244
- compare with another revision
- download diff
- download tarball
- view history from revision 244
- Committer: Holger Seelig
- Date: 2016-04-30 05:14:33 UTC
- Revision ID: holger.seelig@yahoo.de-20160430051433-i69hy9l7hqfcmef0
Added SurfaceEmitter.
- files modified:
- Cobweb.userprefs
added
removed
cobweb.js/cobweb/Components/ParticleSystems/SurfaceEmitter.js
6
6
"cobweb/Basic/FieldDefinitionArray",
7
7
"cobweb/Components/ParticleSystems/X3DParticleEmitterNode",
8
8
"cobweb/Bits/X3DConstants",
9
"cobweb/Bits/X3DCast",
10
"standard/Math/Geometry/Triangle3",
11
"standard/Math/Numbers/Vector3",
12
"standard/Math/Algorithm",
9
13
],
10
14
function ($,
11
15
Fields,
12
16
X3DFieldDefinition,
13
17
FieldDefinitionArray,
14
18
X3DParticleEmitterNode,
15
X3DConstants)
19
X3DConstants,
20
X3DCast,
21
Triangle3,
22
Vector3,
23
Algorithm)
16
24
{
17
25
"use strict";
18
26
27
var
28
vertex1 = new Vector3 (0, 0, 0),
29
vertex2 = new Vector3 (0, 0, 0),
30
vertex3 = new Vector3 (0, 0, 0),
31
direction = new Vector3 (0, 0, 0);
32
19
33
function SurfaceEmitter (executionContext)
20
34
{
21
35
X3DParticleEmitterNode .call (this, executionContext);
22
36
23
37
this .addType (X3DConstants .SurfaceEmitter);
38
39
this .surfaceNode = null;
40
this .areaSoFarArray = [ 0 ];
24
41
}
25
42
26
43
SurfaceEmitter .prototype = $.extend (Object .create (X3DParticleEmitterNode .prototype),
46
63
{
47
64
return "emitter";
48
65
},
66
initialize: function ()
67
{
68
X3DParticleEmitterNode .prototype .initialize .call (this);
69
70
this .surface_ .addInterest (this, "set_surface__");
71
72
this .set_surface__ ();
73
},
74
set_surface__: function ()
75
{
76
if (this .surfaceNode)
77
this .surfaceNode .removeInterest (this, "set_geometry__");
78
79
this .surfaceNode = X3DCast (X3DConstants .X3DGeometryNode, this .surface_);
80
81
if (this .surfaceNode)
82
this .surfaceNode .addInterest (this, "set_geometry__");
83
84
this .set_geometry__ ();
85
},
86
set_geometry__: function ()
87
{
88
if (this .surfaceNode)
89
{
90
delete this .getRandomPosition;
91
delete this .getRandomVelocity;
92
93
var
94
areaSoFar = 0,
95
areaSoFarArray = this .areaSoFarArray,
96
vertices = this .surfaceNode .getVertices ();
97
98
areaSoFarArray .length = 1;
99
100
for (var i = 0, length = vertices .length; i < length; i += 12)
101
{
102
vertex1 .set (vertices [i + 0], vertices [i + 1], vertices [i + 2]);
103
vertex2 .set (vertices [i + 4], vertices [i + 5], vertices [i + 6]);
104
vertex3 .set (vertices [i + 8], vertices [i + 9], vertices [i + 10]);
105
106
areaSoFar += Triangle3 .area (vertex1, vertex2, vertex3);
107
areaSoFarArray .push (areaSoFar);
108
}
109
}
110
else
111
{
112
this .getRandomPosition = getPosition;
113
this .getRandomVelocity = this .getSphericalRandomVelocity;
114
115
direction .set (0, 0, 0);
116
}
117
},
118
getRandomPosition: function (position)
119
{
120
// Determine index0 and weight.
121
122
var
123
areaSoFarArray = this .areaSoFarArray,
124
length = areaSoFarArray .length,
125
fraction = Math .random () * areaSoFarArray [length - 1],
126
index0 = 0,
127
index1 = 0,
128
weight = 0;
129
130
if (length == 1 || fraction <= areaSoFarArray [0])
131
{
132
index0 = 0;
133
weight = 0;
134
}
135
else if (fraction >= areaSoFarArray [length - 1])
136
{
137
index0 = length - 2;
138
weight = 1;
139
}
140
else
141
{
142
var index = Algorithm .upperBound (areaSoFarArray, 0, length, fraction, Algorithm .less);
143
144
if (index < length)
145
{
146
index1 = index;
147
index0 = index - 1;
148
149
var
150
key0 = areaSoFarArray [index0],
151
key1 = areaSoFarArray [index1];
152
153
weight = Algorithm .clamp ((fraction - key0) / (key1 - key0), 0, 1);
154
}
155
else
156
{
157
index0 = 0;
158
weight = 0;
159
}
160
}
161
162
// Interpolate and set position.
163
164
var
165
i = index0 * 12,
166
vertices = this .surfaceNode .getVertices ();
167
168
// Random barycentric coordinates.
169
170
var
171
u = Math .random (),
172
v = Math .random ();
173
174
if (u + v > 1)
175
{
176
u = 1 - u;
177
v = 1 - v;
178
}
179
180
var t = 1 - u - v;
181
182
position .x = u * vertices [i + 0] + v * vertices [i + 4] + t * vertices [i + 8];
183
position .y = u * vertices [i + 1] + v * vertices [i + 5] + t * vertices [i + 9];
184
position .z = u * vertices [i + 2] + v * vertices [i + 6] + t * vertices [i + 10];
185
186
var
187
i = index0 * 9,
188
normals = this .surfaceNode .getNormals ();
189
190
direction .x = u * normals [i + 0] + v * normals [i + 3] + t * normals [i + 6];
191
direction .y = u * normals [i + 1] + v * normals [i + 4] + t * normals [i + 7];
192
direction .z = u * normals [i + 2] + v * normals [i + 5] + t * normals [i + 8];
193
194
return position;
195
},
196
getRandomVelocity: function (velocity)
197
{
198
var speed = this .getRandomSpeed ();
199
200
velocity .x = direction .x * speed;
201
velocity .y = direction .y * speed;
202
velocity .z = direction .z * speed;
203
204
return velocity;
205
},
49
206
});
50
207
208
function getPosition (position)
209
{
210
return this .position .set (0, 0, 0);
211
}
212
51
213
return SurfaceEmitter;
52
214
});
53
215
Loggerhead is a web-based interface for Breezy
Version: 2.0.1