Search found 66 matches

by majestik666
Mon May 13, 2013 9:02 pm
Forum: General Bullet Physics Support and Feedback
Topic: Problem with btCompoundShape
Replies: 2
Views: 1675

Re: Problem with btCompoundShape

check the fractureDemo, it does remove shapes from compounds based on impacts
by majestik666
Tue Apr 09, 2013 8:18 pm
Forum: General Bullet Physics Support and Feedback
Topic: Bullet Fluids
Replies: 3
Views: 1851

Re: Bullet Fluids

as far as I know this is the latest implementation :

https://github.com/rtrius/Bullet-FLUIDS

based on fluids v.2
There is also fluids v.3 but don't think there's a bullet implementation for it as of now
by majestik666
Fri Feb 08, 2013 12:42 am
Forum: Release Announcements
Topic: Bullet 2.78 released: FractureDemo, CCD,SAT contact clipping
Replies: 6
Views: 53925

Re: Bullet 2.78 released: FractureDemo, CCD,SAT contact clip

From here :

http://code.google.com/p/bullet/downloads/list

either the zipped version or you can checkout the trunk directly
by majestik666
Thu Jan 24, 2013 4:25 am
Forum: General Bullet Physics Support and Feedback
Topic: Simple callback question
Replies: 6
Views: 4168

Re: Simple callback question

for the casting issue, bullet has recently switched from btCollisionObject to btCollisionObjectWrapper, casting you current function will likely crash when accessing the collision object if you use a recent cut then your callback function should be of this prototype : bool contactAddedCallbackBullet...
by majestik666
Tue Jan 22, 2013 6:52 pm
Forum: General Bullet Physics Support and Feedback
Topic: Simple callback question
Replies: 6
Views: 4168

Re: Simple callback question

Why isn't gContactAdded not working for you ?

It's called when a new contact is added to the world,
check that either of the rbd pointer is your sphere,
and that should be it ?
by majestik666
Tue Dec 04, 2012 12:10 am
Forum: Physics authoring tools, serialization, standards and related topics
Topic: Bullet dynamica crash when opening scenes
Replies: 5
Views: 6516

Re: Bullet dynamica crash when opening scenes

if you launch maya from a shell with :

maya -d gdb

you should get a stacktrace upon crashing
by majestik666
Sat Dec 01, 2012 9:39 pm
Forum: Physics authoring tools, serialization, standards and related topics
Topic: Bullet dynamica crash when opening scenes
Replies: 5
Views: 6516

Re: Bullet dynamica crash when opening scenes

out of curiosity, do you have a stacktrace of the crash ?

on scene load maya nodes are sometimes not completly ready
so most of the operations have to be delayed until the loading
is finished, really not sure without a stack trace but could be the cause.
by majestik666
Fri Nov 30, 2012 11:44 pm
Forum: General Bullet Physics Support and Feedback
Topic: btSoftBody Mysteries
Replies: 5
Views: 2655

Re: btSoftBody Mysteries

sparseSDF for sparse Signed Distance Field is a memory structure to figure out the distance from the soft body to its environment and to handle collisions from there, sparse being opposed to a full grid, in this one the values only exists in a sparse grid to allow faster processing. Not sure I under...
by majestik666
Fri Nov 30, 2012 11:38 pm
Forum: General Bullet Physics Support and Feedback
Topic: Body gets stuck floating after body below it is removed
Replies: 6
Views: 3000

Re: Body gets stuck floating after body below it is removed

which bullet version are you using ?

There was a bug recently http://code.google.com/p/bullet/source/detail?r=2593
where the companionId wasn't resetted propertly for kinematic objects
leaving some contacts alive when they should have disapeared
by majestik666
Thu Nov 15, 2012 9:21 pm
Forum: General Bullet Physics Support and Feedback
Topic: how do implement a collision shape that constantly change?
Replies: 3
Views: 1658

Re: how do implement a collision shape that constantly chang

I implemented that in our version, basically recomputing a collision shape on every frame based on the input mesh. It's not that efficient but really the only way to do it if you don't know if the topology of the mesh is changing per frame or not. Every frame I do compute new collision shape remove ...
by majestik666
Fri Sep 28, 2012 8:17 am
Forum: General Bullet Physics Support and Feedback
Topic: Upcoming Bullet 2.81 release, please test trunk version
Replies: 7
Views: 4868

Re: Upcoming Bullet 2.81 release, please test trunk version

Been running r2593 since you posted it,
and seems pretty solid, didn't notice any regression so far.

Cheers
Francois
by majestik666
Thu Sep 20, 2012 4:26 am
Forum: General Bullet Physics Support and Feedback
Topic: Major contact stability improvement
Replies: 57
Views: 23894

Re: Major contact stability improvement

I might have spoken too soon ... something else came up with the very latest trunk .. didn't happen before, I couldn't reproduce it in the BasicDemo scene though :/ Basically a stack of boxes being hit by a kinematic sphere, and falling down on another box. With the latest trunk some of the boxes go...
by majestik666
Thu Sep 20, 2012 3:59 am
Forum: General Bullet Physics Support and Feedback
Topic: Major contact stability improvement
Replies: 57
Views: 23894

Re: Major contact stability improvement

yep, just tested and it's all good now !

Thanks a lot for the super speedy fix !!
Francois
by majestik666
Thu Sep 20, 2012 2:17 am
Forum: General Bullet Physics Support and Feedback
Topic: Major contact stability improvement
Replies: 57
Views: 23894

Re: Major contact stability improvement

I'm actually getting some regression it looks like regarding friction .. The older version of Bullet we were running (2.76) seemed to work great but using the latest trunk, it looks like we're not getting any more friction at all coming from kinematic bodies. I don't actually have a basic scene to r...