[Bf-committers] Re: [Bf-blender-cvs] CVS commit: blender/intern/SoundSystem/openal SND_OpenALDevice.cpp SND_OpenALDevice.h

[Kester Maddock]

Hi Alexander,

I haven't made much progress since sunday... sluggish movement is probably due 
to my decreasing of the Impulse threshold - play around with 
SM_Object::ImpulseThreshold in 
source/gameengine/Physics/Sumo/Fuzzics/src/SM_Object.cpp.

Smaller values (~ 0) should give less jittering, larger values should give 
'faster' movement.  Since this value defines the boundary between collision 
and contact, a larger (more negative) value will decrease the collision 
impulse for objects that are in contact.  Since friction is directly 
proportional to collision normal, they too decrease.

The old value was -10, and it wasn't proportional to mass.  And setting the 
ticrate up to 90 Hz is more 2.25 like. (2.25 ran at 100Hz minimum, depending 
on CPU speed.)  Note, dropping physics frames seems to be broken at the 
moment, so don't set the tic rate too high.

I'll set the physics rate to 90 by default I think, and I've just found a 
numerical precision issue (dividing by float too close to zero) which fixes 
jittering.  There's still the precision problem that opposing contact forces 
(eg on a cube) will cause it to rotate.  Maybe a deadzone will fix that.

Kester

On Monday 06 December 2004 09:07, Alexander Ewering wrote:
> Hi Kester,
>
> any update on the Game engine "sluggish movement / jumpy physics" bug
> introduced by one of the last commits? It's unusable in the current
> state :(
>
> (See the reference test file http://pub.intrr.org/game-test4.blend.gz)..
> The player movement doesn't work too well - it worked a few days before,
> and in 2.25 of course...
>
> | alexander ewering              instinctive mediaworks
> | ae[@]instinctive[.]de   http://www[.]instinctive[.]de
>
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