Search found 83 matches

by hiker
Mon Jun 27, 2016 2:06 pm
Forum: General Bullet Physics Support and Feedback
Topic: Ball bouncing at very shallow angle
Replies: 6
Views: 4266

Re: Ball bouncing at very shallow angle

Hi, I've found the problem in our case: the static mesh from which the ball bounces off had no restitution set, so it was 0. The overall restitution is the product of the restitution of both objects, which is then 0 as well, whatever we defined for the ball. We are now experimenting with either givi...
by hiker
Thu Jun 23, 2016 7:12 am
Forum: General Bullet Physics Support and Feedback
Topic: Ball bouncing at very shallow angle
Replies: 6
Views: 4266

Re: Ball bouncing at very shallow angle

Hi, I have seen the same in our game supertuxkart (bullet 2.79 though). Here a trace of a (soccer) ball movement (in green) with the static track (walls) in purple, and a zoomed in version: bouncing1.jpg bouncing2.jpg We actually added a push-back force from the wall to avoid the problem that the ba...
by hiker
Wed Jun 22, 2016 11:58 am
Forum: General Bullet Physics Support and Feedback
Topic: Incorrect collision normal in sphere/triangle mesh collision
Replies: 5
Views: 5160

Re: Incorrect collision normal in sphere/triangle mesh colli

Hi, thanks for your answer! It's basically the same patch applied at two locations (once for sphere triangle collision, the other for convex vs triangle). Then I guess it affects spheres made with one btMultiSphereShape too, isn't t? Indeed. See attached graph (didn't have time for a video) showing ...
by hiker
Tue Jun 21, 2016 3:57 am
Forum: General Bullet Physics Support and Feedback
Topic: Incorrect collision normal in sphere/triangle mesh collision
Replies: 5
Views: 5160

Re: Incorrect collision normal in sphere/triangle mesh colli

Hi Benelot, thank you for your quick answer! Sounds like a cool game! Is it open source? Yes, please check http://supertuxkart.net (we have just done a new RC: https://sourceforge.net/projects/supertuxkart/files/SuperTuxKart/0.9.2/) Concerning your issue, it sounds strange to just hardcode the conta...
by hiker
Mon Jun 20, 2016 4:26 am
Forum: General Bullet Physics Support and Feedback
Topic: Wheel woes. (Solved sorta, but new questions in 2nd post.)
Replies: 3
Views: 2851

Re: Wheel woes. (Solved sorta)

I made the car into a compound shape with (4 cylinders, 1 box) instead of the box that it was. I wish that debug draw would show me the compound shape the cylinders seem to be invisible. The cylinders (compound mesh) seem to be necessary for the raycast car to function. I assume you want to use the...
by hiker
Sat Jun 18, 2016 1:17 pm
Forum: General Bullet Physics Support and Feedback
Topic: Incorrect collision normal in sphere/triangle mesh collision
Replies: 5
Views: 5160

Incorrect collision normal in sphere/triangle mesh collision

Hi, in our game supertuxkart we've recently added a soccer mode. But during testing we discovered that now and again the ball would suddenly jump up a bit. The ground is a totally flat rectangle (>90x170 units) made out of 8x8 triangles (originally we used 2 triangles, but I seemed to remember some ...
by hiker
Mon Feb 25, 2013 2:25 am
Forum: General Bullet Physics Support and Feedback
Topic: I can't get the same result.
Replies: 4
Views: 2907

Re: I can't get the same result.

Though I can get really same results with toy problems, I can't get the same results with complicate simulation... In SuperTuxKart we actually reset the variable m_localTime of btDiscreteDynamicsWorld to 0 if we replay a race. Otherwise this variable will have some 'left over' time: m_localTime += ...
by hiker
Mon Feb 18, 2013 10:50 am
Forum: General Bullet Physics Support and Feedback
Topic: Missing normalisation in btRaycastVehicle
Replies: 0
Views: 1611

Missing normalisation in btRaycastVehicle

Hi, I've just spent some time debugging a bullet problem - when falling down on one particular spot the kart would be shot up high into the sky. Reason is that m_hitNormalInWorld in btVehicleRaycasterResult is not normalised. While I knew that this value is not normalised (I normalise it in my code ...
by hiker
Wed Dec 12, 2012 3:45 am
Forum: Applications, Games, Demos or Movies using Bullet
Topic: SuperTuxKart 0.8 released
Replies: 0
Views: 4641

SuperTuxKart 0.8 released

Hi, over a year after the 0.7.3 release, we are proud and excited to announce the release of SuperTuxKart 0.8 - still using bullet 2.79! You can now enjoy a story mode with challenges against a stronger AI, and improved physics with better (*grin* in all honesty - faked) skidding and collisions. Tra...
by hiker
Tue Nov 15, 2011 3:38 am
Forum: Applications, Games, Demos or Movies using Bullet
Topic: SuperTuxKart 0.7
Replies: 4
Views: 6749

Re: SuperTuxKart 0.7.1

Hi all, we have just released the version 0.7.3 of SuperTuxKart: 800px-0_7_2_golf.jpg Most important improvements: New Minigolf track (don't let its childish look trick you, it is a very challenging track :) ) New Zen Garden track New Subsea track New Island battle arena New Suzanne kart New weapons...
by hiker
Mon Apr 18, 2011 1:29 am
Forum: Applications, Games, Demos or Movies using Bullet
Topic: SuperTuxKart 0.7
Replies: 4
Views: 6749

Re: SuperTuxKart 0.7.1

Hi, just another quick update: we have just released SuperTuxKart 0.7.1, which also included an update from bullet 2.68 to 2.77 (gee, now we have to update to 2.78 - we are too slow). http://4.bp.blogspot.com/-hm4Wje_DzaE/TWwyAJdZ1BI/AAAAAAAAAKY/j-9W0W1gOIc/s1600/STK3.jpg ChangeLog: * Update to bull...
by hiker
Wed Mar 23, 2011 5:09 am
Forum: Applications, Games, Demos or Movies using Bullet
Topic: SuperTuxKart
Replies: 24
Views: 26197

Re: SuperTuxKart

Mapsking wrote:I'm not sure if this is the right place or not, but I've been using SuperTuxKart for a while,
It's not really - could you post the same question in our forum at http://supertuxkart.sourceforge.net/forum? I'll answer there.

Cheers,
Joerg
by hiker
Wed Dec 22, 2010 11:34 pm
Forum: Applications, Games, Demos or Movies using Bullet
Topic: SuperTuxKart 0.7
Replies: 4
Views: 6749

Re: SuperTuxKart 0.7

Hi, I believe I've installed the old version on my Ubuntu partition through the "Software Center" application some time ago (BTW: nice game! With a lot of different tracks!). To get the updated version, do I have to reinstall it, or it will get automatically updated through a system update ? (Basica...
by hiker
Tue Dec 21, 2010 4:33 am
Forum: Applications, Games, Demos or Movies using Bullet
Topic: SuperTuxKart 0.7
Replies: 4
Views: 6749

SuperTuxKart 0.7

Hi, I just wanted to let you know that we have just release SuperTuxKart 0.7 - the fun kart racing game for Linux, Windows and Macs. We are still using the rather old bullet 2.68, but have changed the graphics engine from plib to irrlicht: http://supertuxkart.sourceforge.net/persistent/images/5/58/S...
by hiker
Tue Jul 06, 2010 12:51 am
Forum: General Bullet Physics Support and Feedback
Topic: G++ 4.4.4-6 optimisation causes bullet crash
Replies: 0
Views: 1251

G++ 4.4.4-6 optimisation causes bullet crash

Hi, we recently discovered a crash in bullet caused by a compiler optimisation. While we are still using bullet 2.68, the file in question hasn't changed much in recent bullet versions, so chances are that someone else might have the same problems: It happens with Debian g++, release 4.4.4-6. If the...