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
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="x-ua-compatible" content="IE=Edge"/>
<title>TripletScheduler — NvCloth 1.1.5 documentation</title>
<link rel="stylesheet" href="../_static/default.css" type="text/css" />
<link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
<link rel="stylesheet" href="../_static/breathe.css" type="text/css" />
<link rel="stylesheet" href="../_static/application.css" type="text/css" />
<link rel="stylesheet" href="../_static/styleguide.css" type="text/css" />
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT: '../',
VERSION: '1.1.5',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: true
};
</script>
<script type="text/javascript" src="../_static/jquery.js"></script>
<script type="text/javascript" src="../_static/underscore.js"></script>
<script type="text/javascript" src="../_static/doctools.js"></script>
<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<script type="text/javascript" src="../_static/bootstrap.js"></script>
<script type="text/javascript" src="../_static/jquery.cookie.js"></script>
<script type="text/javascript" src="../_static/jquery.storageapi.js"></script>
<link rel="top" title="NvCloth 1.1.5 documentation" href="../index.html" />
<link rel="up" title="Internal cooking documentation" href="Index.html" />
<link rel="prev" title="Internal cooking documentation" href="Index.html" />
</head>
<body>
<nav class="navbar navbar-inverse navbar-default">
<div class="row">
<div class="navbar-brand">
<img class="logo" src="../_static/developerzone_gameworks_logo.png" alt="Logo"/>
</div>
<div id="searchbox" style="display: none; float:right; padding-top:4px; padding-right:4px">
<form class="search form-inline" action="../search.html" method="get">
<div class="form-group">
<input type="text" name="q" class="form-control" />
<input type="submit" value="Search" class="btn btn-primary" />
</div>
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</nav>
<div class="masthead">
<div class="row">
<ul class="breadcrumb">
<li><a href="../index.html">NvCloth 1.1.5 documentation</a></li>
<li><a href="Index.html" accesskey="U">Internal cooking documentation</a></li>
</ul>
</div>
</div>
<div class="row">
<div class="col-md-3 bs-sidenav" style="white-space: nowrap; overflow: auto;">
<div class="bs-sidebar">
<div id="sidebar_toc">
<h4>Table Of Contents</h4>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../ReleaseNotes/index.html">Release Notes</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../ReleaseNotes/index.html#id1">1.1.5</a></li>
<li class="toctree-l2"><a class="reference internal" href="../ReleaseNotes/index.html#id2">1.1.4</a></li>
<li class="toctree-l2"><a class="reference internal" href="../ReleaseNotes/index.html#id3">1.1.3</a></li>
<li class="toctree-l2"><a class="reference internal" href="../ReleaseNotes/index.html#id4">1.1.2</a></li>
<li class="toctree-l2"><a class="reference internal" href="../ReleaseNotes/index.html#id5">1.1.1</a></li>
<li class="toctree-l2"><a class="reference internal" href="../ReleaseNotes/index.html#id6">1.1.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="../ReleaseNotes/index.html#id7">1.0.0</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../Compiling/index.html">Compiling</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../Compiling/index.html#windows">Windows</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Compiling/index.html#linux">Linux</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Compiling/index.html#mac">Mac</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Compiling/index.html#ios">iOS</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Compiling/index.html#android">Android</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../Modules/Index.html">Modules</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../Modules/Index.html#nvcloth">NvCloth</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Modules/Index.html#nvcloth-extensions">NvCloth extensions</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../UserGuide/Index.html">User Guide</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../UserGuide/Index.html#setup">Setup</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#initializing-the-library">Initializing the Library</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#factory">Factory</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#fabric-cloth">Fabric & Cloth</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../UserGuide/Index.html#fabric">Fabric</a></li>
<li class="toctree-l4"><a class="reference internal" href="../UserGuide/Index.html#cloth">Cloth</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#solver">Solver</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#retrieving-simulation-data">Retrieving simulation data</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../UserGuide/Index.html#usage">Usage</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#common-cloth-properties">Common cloth properties</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#tethers">Tethers</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#collision-detection">Collision detection</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#local-space-simulation">Local space simulation</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#drag-lift-and-wind">Drag lift and wind</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#distance-motion-constraints">Distance/Motion constraints</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#attaching-cloth-to-animated-characters">Attaching cloth to animated characters</a></li>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#unit-scaling">Unit scaling</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../UserGuide/Index.html#troubleshooting">Troubleshooting</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../UserGuide/Index.html#parts-of-cloth-disappearing-for-single-frame">Parts of cloth disappearing (for single frame)</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../CopyRight/Index.html">NVIDIA Copyright Notice</a></li>
<li class="toctree-l1"><a class="reference internal" href="../Solver/Index.html">Internal solver function/algorithm documentation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#particle-invmass-w-component">Particle invMass w component</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#slack">Slack</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#log-stiffness">Log Stiffness</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#integration">Integration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#wind-simulation">Wind simulation</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#distance-constraints">Distance constraints</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#tether-constraints">Tether constraints</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#edge-constraints">Edge constraints</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#separation-constraints">Separation constraints</a></li>
<li class="toctree-l2"><a class="reference internal" href="../Solver/Index.html#fabric-data-structure">Fabric data structure</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../CollisionDetection/Index.html">Internal collision detection documentation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../CollisionDetection/Index.html#overview-of-the-different-modules">Overview of the different modules</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html">Sphere Capsule collision detection</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#sphere-capsule-generation">Sphere/ Capsule generation</a></li>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#sphere-acceleration-structure">Sphere acceleration structure</a></li>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#collideparticles">collideParticles()</a></li>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#capsule-collision-detection">Capsule collision detection</a><ul>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#cone-collision-detection">Cone collision detection</a></li>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#sphere-collision-detection">Sphere collision detection</a></li>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#sphere-ccd">Sphere CCD</a></li>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#cone-ccd">Cone CCD</a></li>
</ul>
</li>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/SphereCapsuleCollision.html#calculatefrictionimpulse">calculateFrictionImpulse()</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../CollisionDetection/SelfCollision.html">Self Collision</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/SelfCollision.html#overview">Overview</a></li>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/SelfCollision.html#acceleration-structure">Acceleration structure</a><ul>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/SelfCollision.html#grid-setup">Grid setup</a></li>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/SelfCollision.html#particle-sorting">Particle sorting</a></li>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/SelfCollision.html#key-range-sweep">Key range sweep</a></li>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/SelfCollision.html#collision-detection-and-response">Collision detection and response</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../CollisionDetection/InterCollision.html">Inter Collision</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/InterCollision.html#overview">Overview</a></li>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/InterCollision.html#broad-phase-collision-detection">Broad phase collision detection</a></li>
<li class="toctree-l4"><a class="reference internal" href="../CollisionDetection/InterCollision.html#acceleration-structure">Acceleration structure</a><ul>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/InterCollision.html#id1">Broad phase collision detection</a></li>
<li class="toctree-l5"><a class="reference internal" href="../CollisionDetection/InterCollision.html#differences-with-self-collision">Differences with self collision</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../CollisionDetection/Index.html#todo">Todo</a></li>
</ul>
</li>
<li class="toctree-l1 current"><a class="reference internal" href="Index.html">Internal cooking documentation</a><ul class="current">
<li class="toctree-l2 current"><a class="reference internal" href="Index.html#overview-of-the-different-modules">Overview of the different modules</a><ul class="current">
<li class="toctree-l3 current"><a class="current reference internal" href="">TripletScheduler</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#adjacencyquerier">AdjacencyQuerier</a></li>
<li class="toctree-l4"><a class="reference internal" href="#id1">TripletScheduler</a></li>
<li class="toctree-l4"><a class="reference internal" href="#tripletscheduler-simd">TripletScheduler::simd()</a></li>
<li class="toctree-l4"><a class="reference internal" href="#tripletscheduler-warp">TripletScheduler::warp()</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<h4>Previous topic</h4>
<p class="topless"><a href="Index.html"
title="previous chapter">Internal cooking documentation</a></p>
<div id="searchbox" style="display: none">
<h4>Quick search</h4>
<form class="search form-inline" action="../search.html" method="get">
<div class="form-group">
<input type="text" name="q" class="form-control" />
<input type="submit" value="Search" class="btn btn-primary" />
</div>
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
<p class="searchtip" style="font-size: 90%">
Enter search terms or a module, class or function name.
</p>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</div>
<div class="document col-md-8">
<div class="body">
<div class="section" id="tripletscheduler">
<h1>TripletScheduler<a class="headerlink" href="#tripletscheduler" title="Permalink to this headline">¶</a></h1>
<div class="section" id="adjacencyquerier">
<h2>AdjacencyQuerier<a class="headerlink" href="#adjacencyquerier" title="Permalink to this headline">¶</a></h2>
<p>AdjacencyQuerier is a helper class that produces lists of adjacent triplets (triangles) for particles, from the given list of triangles.
The algorithm to generate these lists is described in this section.</p>
<p>The result will be stored in one continuous array, instead of separate allocations.
For all particles we count how often each particle is referenced by a triangle and store this in <tt class="code docutils literal"><span class="pre">adjacencyCount[i]</span></tt> for particle <tt class="code docutils literal"><span class="pre">i</span></tt>.
This will determine the size of the individual adjacency lists.
Next, we calculate the inclusive prefix sum of <tt class="code docutils literal"><span class="pre">adjacencyCount</span></tt> and store it in <tt class="code docutils literal"><span class="pre">mAdjacencyIndecies</span></tt> (which contains one element more than <tt class="code docutils literal"><span class="pre">adjacencyCount</span></tt>, for later use).
Now the last element of <tt class="code docutils literal"><span class="pre">mAdjacencyIndecies</span></tt> contains the total size of all adjacency lists combined, so <tt class="code docutils literal"><span class="pre">mAdjacencies</span></tt> can be allocated.</p>
<p>To generate the adjacency lists we loop through all triplets and store the triplet index in the adjacency list of each particle.
We use <tt class="code docutils literal"><span class="pre">mAdjacencyIndecies[i]-1</span></tt> to find the beginning of the adjacency list inside <tt class="code docutils literal"><span class="pre">mAdjacencies</span></tt> for particle <tt class="code docutils literal"><span class="pre">i</span></tt>.
<tt class="code docutils literal"><span class="pre">mAdjacencyIndecies[i]</span></tt> is decremented so the next one will be written in a new location.
The values in <tt class="code docutils literal"><span class="pre">mAdjacencyIndecies</span></tt> will be decremented to be the exclusive prefix sum after all the lists are filled (still pointing to all the beginnings of the lists).
The extra element can be used so that the list range can be given like <tt class="code docutils literal"><span class="pre">Range<uint32_t>(mAdjacencies[mAdjacencyIndecies[i]],mAdjacencies[mAdjacencyIndecies[i+1]])</span></tt> without going out of bounds for the last list.</p>
<p>The following tables give example values for the arrays with a square cloth plane of 9 particles (without alternating diagonals):</p>
<img src="../_images/AdjacencyTables.svg" /></div>
<div class="section" id="id1">
<h2>TripletScheduler<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
<p>The triplet scheduler is used to order triplets so that multiple can be processed in parralell (using simd, or gpu parralelism).
The triplets need to be reordered in a way that only unique particles are processed at the same time to avoid race conditions and/or result stomping.</p>
</div>
<div class="section" id="tripletscheduler-simd">
<h2>TripletScheduler::simd()<a class="headerlink" href="#tripletscheduler-simd" title="Permalink to this headline">¶</a></h2>
<p>This function is used to sort triplets for simd processing on the cpu.
The input <tt class="code docutils literal"><span class="pre">mTriplets</span></tt> will be reordered in place to create batches of <tt class="code docutils literal"><span class="pre">simdWidth</span></tt> triplets that don’t share particles.
We keep track of sets of batches, instead of adding padding when a batch cannot be filled.
A set is a range of triplets that is successfully divided in batches.
A new set should only start after a batch could not be filled with unique triplets.
We also track the total amount of padding needed to make the set sizes a multiple of <tt class="code docutils literal"><span class="pre">simdWidth</span></tt>, which is used to reserve the size of <tt class="code docutils literal"><span class="pre">mPaddedTriplets</span></tt>.
Now each set can be copied into <tt class="code docutils literal"><span class="pre">mPaddedTriplets</span></tt> with the correct padding without having to resize the list. (this used to be done in <tt class="code docutils literal"><span class="pre">SwCloth::setVirtualParticles</span></tt>).</p>
<img src="../_images/Simd.svg" /></div>
<div class="section" id="tripletscheduler-warp">
<h2>TripletScheduler::warp()<a class="headerlink" href="#tripletscheduler-warp" title="Permalink to this headline">¶</a></h2>
<p>This function is used to sort triplets for cuda/gpu processing.
It will generate sets of triplets that can be processed in parallel in a cuda warp, ensuring that no duplicate particles are processed in parallel.
It also optimizes the sets to have the least amount of bank conflicts possible.</p>
</div>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="col-md-1"></div>
</div>
<div class="masthead">
<div class="row">
<ul class="breadcrumb">
<li><a href="../index.html">NvCloth 1.1.5 documentation</a></li>
<li><a href="Index.html" >Internal cooking documentation</a></li>
</ul>
</div>
</div>
<footer>
<div class="footer-boilerplate">
<div class="row">
<div class="boilerplate">
Copyright © 2019, NVIDIA Corporation | <a href="http://www.nvidia.com/object/about-nvidia.html" onclick="s_objectID="http://www.nvidia.com/object/about-nvidia.html_1";return this.s_oc?this.s_oc(e):true">About NVIDIA </a> | <a href="http://www.nvidia.com/object/legal_info.html" onclick="s_objectID="http://www.nvidia.com/object/legal_info.html_1";return this.s_oc?this.s_oc(e):true">Legal Information </a> | <a href="http://www.nvidia.com/object/privacy_policy.html" onclick="s_objectID="http://www.nvidia.com/object/privacy_policy.html_1";return this.s_oc?this.s_oc(e):true">Privacy Policy </a>
</div>
</div>
</div>
</div>
</footer>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
extensions: ["tex2jax.js"],
jax: ["input/TeX", "output/HTML-CSS"],
tex2jax: {
processEscapes: true,
skipTags: ["script","noscript","style","textarea"]
},
"HTML-CSS": { availableFonts: ["TeX"] },
TeX: {
Macros: {
Lrg: ['\\displaystyle{#1}', 1, ""]
}
}
});
</script>
<script type="text/javascript" async
src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML">
</script>
<script>
var treestatename = 'GWDocsTreeState';
var protocol = location.href.split('/')[0].toLowerCase();
var storage;
if (protocol.substring(0,4) == 'http') {
storage = $.cookieStorage;
storage.setPath('/');
} else {
storage = $.localStorage;
}
if (storage.isEmpty(treestatename)) {
storage.set(treestatename, {});
}
var treestate = storage.get(treestatename);
$.each($("#sidebar_toc ul li"), toc_walker);
function toc_walker(key, value) {
var handleSpan = $("<span></span>")
.addClass("toc_handle").prependTo(value);
handleSpan.attr("id", $(value).closest("div").attr("id") + "." + key);
if($(value).has("ul li").size() > 0) {
var id = handleSpan.attr("id");
if (!(id in treestate)) {
treestate[id] = false;
}
handleSpan.addClass("toc_expanded").click(function() {
$(this).toggleClass("toc_expanded toc_collapsed").siblings("ul").toggle();
treestate[$(this).attr('id')] = $(this).hasClass('toc_expanded');
storage.set(treestatename, treestate);
});
if(!($(this).hasClass('current') || treestate[id])) {
handleSpan.click();
}
if($(this).hasClass('current')) {
treestate[handleSpan.attr('id')] = handleSpan.hasClass('toc_expanded');
storage.set(treestatename, treestate);
}
}
}
</script>
</body>
</html>
|