iphone - Prismatic Joint causes a crash-Box2D(cocos2d) -


i tried set prismatic joint, error upon run time: assertion failed: (islocked() == false), function createbody, file /users/aether/developer/jfrecode/jfrecode/libs/box2d/dynamics/b2world.cpp, line 109.

here code screen boundaries since using bodyb.

cgsize s = [ccdirector shareddirector].winsize;       //define screen boundaries      // create edges around entire screen      b2bodydef groundbodydef;      groundbodydef.position.set(0,0);      _groundbody = _world->createbody(&groundbodydef);       b2edgeshape groundbox;      b2fixturedef groundboxdef;      groundboxdef.shape = &groundbox;       groundbox.set(b2vec2(0,0), b2vec2(s.width/ptm_ratio, 0));      _bottomfixture = _groundbody->createfixture(&groundboxdef);       groundbox.set(b2vec2(0,0), b2vec2(0, s.height/ptm_ratio));      _groundbody->createfixture(&groundboxdef);       groundbox.set(b2vec2(0, s.height/ptm_ratio), b2vec2(s.width/ptm_ratio,      s.height/ptm_ratio));      _groundbody->createfixture(&groundboxdef);       groundbox.set(b2vec2(s.width/ptm_ratio, s.height/ptm_ratio),      b2vec2(s.width/ptm_ratio, 0));      _groundbody->createfixture(&groundboxdef);

here code prismatic joint itself

    b2prismaticjointdef jointdef;     b2vec2 worldaxis(1.0f,0.0f);     jointdef.collideconnected = true;     jointdef.initialize(_shipbody,_groundbody,                          _shipbody->getworldcenter(), worldaxis);     _world->createjoint(&jointdef);

islocked indicates physics world being updated. means you're running code during world step method, in or result of contact callback method. delay executing code until after world step.


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