Real-Time Physics Simulation Forum

Re: Bullet 2.73 SP1 released: fast btCudaBroadphase, SSE sol

2011-07-08T09:04:02+00:00

In this release CharacterDemo crash at startup. I also see problems with acces to btRigidBody from my classes. With 2.72 all works properly. I was compiled it internet marketing tips VC2008EE, and I tested on Vista x64 and Windows XP, on both systems I have errors. In Debug mode CharacterDemo is ok.

Statistics: Posted by lika147 — Fri Jul 08, 2011 9:04 am

Re: Bullet 2.73 released: fast btCudaBroadphase

2008-11-26T14:42:34+00:00

Hey Erwin Coumans,
Please recognized another nice iPhone engine using Bullet, called sio2:
http://sio2interactive.com/

Join their development group for Bullet support:
http://code.google.com/p/sio2/

Statistics: Posted by diehard — Wed Nov 26, 2008 2:42 pm

Re: Bullet 2.73 released: fast btCudaBroadphase

2008-11-25T13:38:44+00:00

Hi,

you have left some errors in the 2.73 package:

/data/bullet-2.73/Demos/ConstraintDemo/ConstraintDemo.cpp:35:1: warning: "M_PI" redefined
In file included from /data/bullet-2.73/src/LinearMath/btScalar.h:20,
from /data/bullet-2.73/src/LinearMath/btQuadWord.h:19,
from /data/bullet-2.73/src/LinearMath/btVector3.h:20,
from /data/bullet-2.73/src/BulletCollision/CollisionDispatch/btCollisionWorld.h:71,
from /data/bullet-2.73/src/btBulletCollisionCommon.h:22,
from /data/bullet-2.73/src/btBulletDynamicsCommon.h:20,
from /data/bullet-2.73/Demos/ConstraintDemo/ConstraintDemo.cpp:19:
/usr/include/math.h:355:1: warning: this is the location of the previous definition
/data/bullet-2.73/Demos/ConstraintDemo/ConstraintDemo.cpp:36:1: warning: "M_PI_2" redefined
/usr/include/math.h:356:1: warning: this is the location of the previous definition

M_PI is usually defined in math.h, so there is no need to define it anyway again...

Running on Red Hat 5 x86_64:

./autogen.sh
running aclocal
running libtool
libtool worked.
running automake
configure.ac: installing `./missing'
Demos/AllBulletDemos/Makefile.am: installing `./depcomp'
Extras/Makefile.am: installing `./compile'
src/Makefile.am:293: whitespace following trailing backslash
Makefile.am: installing `./COPYING'
running autoheader
running autoconf
configure.ac:120: error: possibly undefined macro: _AC_SRCDIRS
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
autogen.sh complete

Then executing ./configure:

checking how to create a directory tree... mkdir -p
checking for install... /usr/bin/install -c
checking for doxygen... doxygen
checking for dot... dot
checking for perl5... no
checking for perl... perl
checking for perl5... (cached) perl
checking for TemplateToolkit... no
checking for ttree... no
checking how to disable C++ exceptions... -fno-exceptions
./configure: line 23155: syntax error near unexpected token `"."'
./configure: line 23155: ` _AC_SRCDIRS(".")'

cmake build compiles so far...

Statistics: Posted by Enrico — Tue Nov 25, 2008 1:38 pm

Re: Bullet 2.73 released: fast btCudaBroadphase

2008-11-25T00:15:02+00:00

Hi Erwin,

Nice work on the new CUDA broadphase - it's good see somebody using the code from our CUDA SDK for something useful!

There are a lot of ways you could optimize this code. Have you tried doing the scan using CUDPP? It might be a bit faster than doing it on the CPU (avoids the transfers).

Cheers,

Simon.

Hello Simon,

Thanks for the reply.
I plan to move more code to the CUDA side and the scan is definitely one of the candidates.
However I don't expect a big perfomance gain from it - now scan takes only a small (~1%) amount of time.
I will optimize the time-consuming code code first

Thanks again,
Roman Ponomarev

Statistics: Posted by rponomarev — Tue Nov 25, 2008 12:15 am

Re: Bullet 2.73 released: fast btCudaBroadphase

2008-11-24T13:48:41+00:00

Hi,

Code:

BT_DECLARE_ALIGNED_ALLOCATOR();

don't solve this problem.

How do you allocate a btRigidBody exactly?

I create class "CollisionPack" with CollisionShape, Body, Mass etc. and next I use it for my Entity class. When Entity is create I apply position, rotation and add Body from "CollisionPack" to physic world by 'addRigidBody'

Statistics: Posted by nadro — Mon Nov 24, 2008 1:48 pm

Re: Bullet 2.73 released: fast btCudaBroadphase

2008-11-24T11:38:52+00:00

Hi Erwin,

Nice work on the new CUDA broadphase - it's good see somebody using the code from our CUDA SDK for something useful!

There are a lot of ways you could optimize this code. Have you tried doing the scan using CUDPP? It might be a bit faster than doing it on the CPU (avoids the transfers).

Cheers,

Simon.

Statistics: Posted by simesgreen — Mon Nov 24, 2008 11:38 am

Re: Bullet 2.73 released: fast btCudaBroadphase

2008-11-24T04:26:36+00:00

When I use 'class btQuadWordStorage' instead 'ATTRIBUTE_ALIGNED16(class) btQuadWordStorage' all is ok. I use VS2008EE. Maybe 'ATTRIBUTE_ALIGNED16(class) btQuadWordStorage' shouldn't default parameter?

We are preparing for SIMD support, but if it causes problems we could remove ATTRIBUTE_ALIGNED16 in a future release.
How do you allocate a btRigidBody exactly?

Can you try to add this at line 76 of btRigidBody.h and see if that helps?

Code:

 BT_DECLARE_ALIGNED_ALLOCATOR();

Thanks for the report,
Erwin

Statistics: Posted by Erwin Coumans — Mon Nov 24, 2008 4:26 am

Re: 2.73 and iPhone

2008-11-24T03:47:14+00:00

Isn't Bullet supposed to have out-of-box iphone support?

Bullet library compiles out-of-the box, but libglui not yet indeed. So for demos/graphics on iPhone we provide the Oolong Engine. Just open Oolong Engine2/Examples/Physics/FallingCubes/FallingCubes.xcodeproj and configure your iPhone developer license.

The Oolong Engine includes the updated Bullet 2.73 library, and uses the same Zlib license:
http://oolongengine.googlecode.com

Hope this helps,
Erwin

Statistics: Posted by Erwin Coumans — Mon Nov 24, 2008 3:47 am

2.73 and iPhone

2008-11-23T16:49:38+00:00

I used Cmake -G Xcode
With this I could build most OSX demos with Xcode.

When I selected iPhone architecture in Xcode, I could only build the libraries.
The demos, and libGLUI failed.

E.g. libGLUI gave me:
OpenGL/gl.h no such file or directory.

Isn't Bullet supposed to have out-of-box iphone support?

thx,

Bram

Statistics: Posted by bram — Sun Nov 23, 2008 4:49 pm

Re: Bullet 2.73 released: fast btCudaBroadphase

2008-11-23T12:18:21+00:00

Hi, I found source of my second problem in this release:

Code:

Rev 1493: /src/LinearMath/btQuadWord.h#ifndef USE_LIBSPE2ATTRIBUTE_ALIGNED16(class) btQuadWordStorage#elseclass btQuadWordStorage#endif

In small size test application eg. Bullet demos etc. all works ok, but in my game engine I have problem. When I try get access to Body and return some values eg. position, sometimes I don't have properly value. Example:

Code:

class Entity{...btRigidBody* getBody(){cout << Body->getCenterOfMassPosition().getY(); // works okreturn Body;}...};

but, when sometimes I get this Body, example:

Code:

cout << World->getEntityManager()->getEntity(0)->getBody()->getCenterOfMassPosition().getY(); // value is wrong

When I use 'class btQuadWordStorage' instead 'ATTRIBUTE_ALIGNED16(class) btQuadWordStorage' all is ok. I use VS2008EE. Maybe 'ATTRIBUTE_ALIGNED16(class) btQuadWordStorage' shouldn't default parameter?

Statistics: Posted by nadro — Sun Nov 23, 2008 12:18 pm