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	<title>Real-Time Physics Simulation Forum</title>
	
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	<updated>2006-10-18T12:04:36+00:00</updated>

	<author><name><![CDATA[Real-Time Physics Simulation Forum]]></name></author>
	<id>https://pybullet.org/Bullet/phpBB3/app.php/feed/topic/597</id>

		<entry>
		<author><name><![CDATA[DevO]]></name></author>
		<updated>2006-10-18T12:04:36+00:00</updated>

		<published>2006-10-18T12:04:36+00:00</published>
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		<title type="html"><![CDATA[Moving Triangle vs Moving Sphere]]></title>

		
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Thanks Erwin!<br>The main purpose is the collision in simple cloth engine, so thiriangles may rotate an even change it shape but not as much.<br><br>Gjk seems to be not robust if colliding big convex vs small one and a bit to expensive for this purpose.<p>Statistics: Posted by <a href="https://pybullet.org/Bullet/phpBB3/memberlist.php?mode=viewprofile&amp;u=453">DevO</a> — Wed Oct 18, 2006 12:04 pm</p><hr />
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		<entry>
		<author><name><![CDATA[Erwin Coumans]]></name></author>
		<updated>2006-10-11T20:20:58+00:00</updated>

		<published>2006-10-11T20:20:58+00:00</published>
		<id>https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=2120#p2120</id>
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		<title type="html"><![CDATA[Re: Moving Triangle vs Moving Sphere]]></title>

		
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<blockquote class="uncited"><div>Probably this is common questions but what can some body suggest robust and stabe continuous collision between moving sphere and moving triangle?<br><br>Simple Ray vs Triangle do not work in this case.<br>Find plane and time where all 4 points are on the same plane do not work too becouse collision occur before the sphere is in the triangle...<br><br>Any ideay, links, papers or may be code?<br>Thanks,<br>DevO</div></blockquote>Bullet includes a general way to do continuous collision, between moving convex objects. It depends on how they move, which routine to take. Is the movement just translation, or is there also rotation?<br><br>The general moving convex-convex algorithm that Bullet uses is very efficient, so I can recommend that. It follows a paper by Gino van den Bergen, visit the <a href="http://www.dtecta.com/" class="postlink">http://www.dtecta.com/</a> website, goto 'interesting' and check out the 'raycasting against convex objects', which includes sphere-cast. If you need the rotational case too, you can use Bullet's btContinuousConvexCollision, as described in <a href="http://www.continuousphysics.com/BulletContinuousCollisionDetection.pdf" class="postlink">http://www.continuousphysics.com/Bullet ... ection.pdf</a><br><br>See Demos/ContinuousConvexCollision and Demos/GjkConvexCastDemo in Bullet 2.14 (or later). The pure-linear version is implemented in the SubsimplexCast: <a href="http://www.continuousphysics.com/Bullet/BulletFull/classbtConvexCast.html" class="postlink">http://www.continuousphysics.com/Bullet ... xCast.html</a><br><br>Dave Eberly's geometric tools website might have a solution for the specific case: <a href="http://www.geometrictools.com" class="postlink">http://www.geometrictools.com</a><p>Statistics: Posted by <a href="https://pybullet.org/Bullet/phpBB3/memberlist.php?mode=viewprofile&amp;u=2">Erwin Coumans</a> — Wed Oct 11, 2006 8:20 pm</p><hr />
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		<entry>
		<author><name><![CDATA[DevO]]></name></author>
		<updated>2006-10-10T11:06:20+00:00</updated>

		<published>2006-10-10T11:06:20+00:00</published>
		<id>https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=2111#p2111</id>
		<link href="https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=2111#p2111"/>
		<title type="html"><![CDATA[Moving Triangle vs Moving Sphere]]></title>

		
		<content type="html" xml:base="https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=2111#p2111"><![CDATA[
Probably this is common questions but what can some body suggest robust and stabe continuous collision between moving sphere and moving triangle?<br><br>Simple Ray vs Triangle do not work in this case.<br>Find plane and time where all 4 points are on the same plane do not work too becouse collision occur before the sphere is in the triangle...<br><br>Any ideay, links, papers or may be code?<br>Thanks,<br>DevO<p>Statistics: Posted by <a href="https://pybullet.org/Bullet/phpBB3/memberlist.php?mode=viewprofile&amp;u=453">DevO</a> — Tue Oct 10, 2006 11:06 am</p><hr />
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