pybox2d svn r60

  

svn r60 changelog:

Interface:
b2PolygonShape: getNormals_b2Vec2, getNormals_tuple added
b2Vec2.dot(v2) added.

Miscellaneous:
fluiDemo: Port of Blaze's fluid physics. Too slow in Python to be used in a game. More of a proof of concept. Mostly works, some kinks still there though.

UFOCatcher: Sprites working with Rabbyt, looks pretty but the grip is still not great.

Both require a copy of the data/pgu directories from trunk/testbed to work.

GetNormals() for b2PolygonShape was previously not wrapped, so it was inaccessible from Python. There was always box2d.b2Dot() available for use, but having it built into the b2Vec2 is perhaps more convenient: dotproduct = vec1.dot(vec2) instead of dotproduct = box2d.b2Dot(vec1, vec2).

The fluiDemo, ported from Blaze, is pretty fun to play with. Hopefully the last few bugs can be squashed. I'm sure it'll end up in Box2D itself eventually, at which point we'll be able to use it at full speed! It's just a proof of concept, really, or an extra example of how to use pybox2d.

As far as using Rabbyt for the UFOCatcher game/test, I didn't want to really add another dependency, but it was just too pretty to pass up. If I can find out a good way to get the grip joints working, maybe I'll make an actual little game out of it. I'd like to port it to the XO, but that'll require not using Rabbyt or OpenGL.

OLPC Physics Jam

The jam (which used pybox2d on the One Laptop per Child XO) finished up this past weekend. Their final presentations are here.

I'm rather partial to the Rollcats. :)

pybox2d svn r57

* Updated to Box2D SVN r173.
* Note that r173's Makefile needs to be modified to include b2LineJoint.cpp
* Line joints! Testbed ported, formatting updated.

pybox2d svn r51

So, I figured I'd detail some of the changes made to pybox2d a bit more in detail here. Here's the changes in r51:

* RayCasts working!
* Fixed some cvar confusion:
Since you can't do dir(box2d.cvar), I added a (mostly complete) list in box2d.cvars:

for c in box2d.cvars:
  print c, getattr(box2d.cvar, c)

will show plenty of information:

b2_pi 3.14159274101
b2_maxManifoldPoints 2
b2_maxPolygonVertices 8
b2_maxProxies 512
b2_maxPairs 4096
b2_linearSlop 0.00499999988824
b2_angularSlop 0.0349065884948
b2_toiSlop 0.0399999991059
b2_maxTOIContactsPerIsland 32
b2_maxTOIJointsPerIsland 32
b2_velocityThreshold 1.0
b2_maxLinearCorrection 0.20000000298
b2_maxAngularCorrection 0.139626353979
b2_maxLinearVelocity 200.0
...

pybox2d svn up until r50

(pictured: test_TheoJansen.py running on the Pyglet 1.1 testbed)

Recent changes up to r50:

setup.py: Allow for CXXFLAGS to be used (OS X -> Universal Binaries, Linux -> x64) (r47)
TestSegment works (thanks for the tip, neonnds!) (r35)
Backported the testbed to pyglet 1.1. (r50)
test_BreakableBody and TriangleMesh added (thanks nimodo!) (forum post)
OS X guide added (thanks neonnds!)
Added more comments, documentation, fixes. Various cleanups.

Everything should now be updated to Box2D r172 (r162 typo in commit log), with new Step function and slingshot in the testbed.

OS X

Thanks to the user neonnds, there is now a really nice guide on how to build pyBox2D under OS X! See it here on the wiki: OSXInstallation

Starting the next release (2.0.2, I'd assume) there will be a full OSX installer to make the installation as easy as in Windows!

Ideas?

The pybox2d library should of course allow access to the standard box2d-style API. Maybe it should also have a secondary Pythonic, easy to use interface.

What would you like to see in the library? How should it work?

Please share your ideas!

(Originally the comments were put in this issue)

Update: This has been indefinitely put on hold.