[ODE] Object size, velocity, time step and collision detection.

[Jon Watte]

Yes, it would. Any discrete-time, penetration-based system would. There is research, and some early game development, into continuous-time collision detection, which would fix this, but ODE does not do it (nor anything else you can buy today). One work-around is to add a ray from your old center to your new center during each collision step, and detect a collision with something static that way. Two simultaneously moving bodies is harder, though, as you need to really form the full moving hulls of them.

Cheers,

			/ h+


-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of Сергей Зефиров 
Sent: Tuesday, January 11, 2005 2:01 AM
To: ode at q12.org
Subject: [ODE] Object size, velocity, time step and collision detection.


Good time of day everyone.

Could ODE miss collision between two, say, spheres if timestep*their relative velocity is bigger
than sum of their radiuses? I've seen this effect in Newton Physics SDK demo (but velocity was
about 250 m/s for objects of size 1-2 m).

Is it worth of some effort to implement continuous collision detection, if so? I've did some
research on topic and could share my findings.

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