[ODE] Silly theoretical question

Erin Catto erincatto at sbcglobal.net
Thu Feb 24 22:48:28 MST 2005

Does anyone know if True Axis handles swept rotations too? I'm guessing that
the full Redon style of interval arithmetic is very slow.


-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org] On Behalf Of Serguey
Sent: Thursday, February 24, 2005 2:03 PM
To: ode at q12.org
Subject: Re[2]: [ODE] Silly theoretical question

> Have you seen Redon's work? He uses a continuous time simulation where 
> collision detection is based on translation AND rotation, and he finds 
> the exact time of intersection (including for triangle meshes). It's 
> fairly computationally expensive, but could probably show up in a game 
> any year now.

As seen on flipcode.com:
True Axis Physics SDK   1:25PM   (0 Comments)

True Axis announced the recent release of the True Axis Physics SDK. Here's
the buzz:
    The True Axis Physics SDK is a new fast and solid physics engine
featuring full swept collision testing making it ideal for games that rely
on fast paced action. Demos of the SDK in action and a free non-commercial
license are available for download.
For more information, visit here.
"here" is http://trueaxis.com/ (I'm not affiliated in any way)

The stuff about Redon's work is more complicated than it seems to be.
For example, it seem to me now that it needs special kind of "stable
on variable timesteps" integrator. Also, I think, not every kind of
motion could be represented by so-called "screw motion."

And, again in my opinion, it is more for robotics than for games.

But Redon's ideas are great source of inspiration. ;)

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