I've used a temporary variable in the global scope as you suggested, and it
still crashes my engine. Not sure how else to go about this..
On Wed, Nov 12, 2008 at 3:27 AM, Gerwin de Haan <[EMAIL PROTECTED]>wrote:
> I don't use Luabind either but osgswig with Python instead. I sometimes
> experience similar surprising effects when passing non-declared variables as
> function arguments. In that case, the reason for this is often that the
> scripting language garbage collector deletes the Vec3f after returning from
> the function, essentially leaving any references to the Vec3 dangling. A
> correct reference counting mechanism in the scripting binding should prevent
> this in most cases.
>
> The problem you're describing could have similar cause. So just to be sure,
> try and define the Vec3f in the global scope and pass a reference as an
> argument in your call.:
> myvec= Vec3f(2,0,0)
> entMan:createStaticEntity( "ball", myvec, false )
> Or, in this function, try and make a copy of the parameter values before
> returning.
>
> regards,
> Gerwin
>
>
> On Wed, Nov 12, 2008 at 8:14 AM, Dusten Sobotta <[EMAIL PROTECTED]>wrote:
>
>> Hello,
>>
>> I've been working on an engine that combines sdl, osg, bullet, open al,
>> and now lua for roughly 6 weeks. Static and dynamic entity creation works
>> well on the fly if handled with C++ code, however if I attempt to off-load
>> this logic to lua, I run into problems. Below is an example of code that is
>> relevant to the problem:
>>
>> ////////////////////////
>> void entityManager::loadStaticEntityList( const std::string& filename ) {
>>
>> lua_State *L = lua_open();
>> luabind::open(L);
>>
>> luabind::module( L ) [
>>
>> luabind::class_<osg::Vec3f>("Vec3f")
>> .def( luabind::constructor< float, float, float >() )
>> ];
>>
>> luabind::module( L ) [
>>
>> luabind::class_<entityManager>("entityManager")
>> .def( luabind::constructor< >() )
>> .def( "createStaticEntity", &entityManager::createStaticEntity )
>> .def("destroyAllEntities", &entityManager::destroyAllEntities )
>> ];
>>
>>
>> if( luaL_loadfile( L, filename.c_str() ) || lua_pcall( L, 0, 0, 0 ) )
>> throw "could not load entity list";
>>
>>
>> createStaticEntity( "ball", osg::Vec3f( 0, 0, 0 ), false ); //direct
>> C++ call; works!
>>
>> luaL_dofile( L, filename.c_str() );
>>
>> }
>> ///////////////////////////
>>
>> ///////////////////////////
>> void entityManager::createStaticEntity( const std::string& type, const
>> osg::Vec3f& position, const bool& dimension ) {
>>
>> entity * newEntity = createEntityP( type, position, dimension );
>> _physicsManager->defineRigidBody( newEntity, type, false, dimension );
>>
>> entities[ newEntity->getRigidBody() ] = newEntity;
>> staticEntities[ dimension ]->addChild( newEntity->getPAT().get() );
>> staticEntityList.push_back( newEntity );
>> }
>> ///////////////////////////
>>
>> And here is the lua script I'm trying to run:
>>
>> ------------------------------
>> entMan = entityManager()
>> a = Vec3f( 0, 0, 0 )
>>
>> --same call from within lua; crashes the engine if uncommented!
>> entMan:createStaticEntity( "ball", Vec3f( 2, 0, 0 ), false )
>> ------------------------------
>>
>>
>> As you can see, a declaration of type Vec3f works from within lua, so I
>> don't think that using Vec3f as a parameter is an issue.
>> Might anyone know what's going on here? I'm not very familiar with
>> luabind, and even less familiar with getting it to play nicely with OSG.
>> Any help would be greatly appreciated.
>>
>>
>>
>> Thanks for your time,
>>
>> Dusten
>>
>> _______________________________________________
>> osg-users mailing list
>> osg-users@lists.openscenegraph.org
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>
>>
>
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