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slow but steady
Join date: 4 Dec 2004
Posts: 129
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05-01-2006 18:19
Is there air friction acting against flying prims, or is everything that leaves the ground in outer space?
I assume wind has no effect, but I guess I need an answer to that also.
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Torley Linden
Enlightenment!
Join date: 15 Sep 2004
Posts: 16,530
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05-02-2006 17:36
Mastery of SL physics required... asking Andrew about this...  |
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Andrew Linden
Linden staff
Join date: 18 Nov 2002
Posts: 692
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05-02-2006 19:25
There is no air friction, or water friction for that matter. Havok-1 has a built-in 'friction' method however it is numerically unstable, especially for small objects, and requires a lot of tuning to the physics engine and parameter space to make it work right.
Someday there may be air friction, but it would have to be enabled on a per-object basis -- some people won't want their stuff getting blown away by the wind.
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Andrew Linden
Linden staff
Join date: 18 Nov 2002
Posts: 692
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05-03-2006 07:31
Argent Stonecutter suggested I mention the speed limit of projectiles.
Objects in SL are limited to 50 meters/second. This is not a feature of the physics engine -- it is done where we sync our own data structures with the information in the physics engine. Any object moving faster than 50 m/sec after a step of the physics engine is clamped to the speed limit before the next step.
The reason for the limit is to reduce the likelihood of fast objects tunneling through and interpenetration of other objects as well as general numerical stability of the physics engine.
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