get all entities in AABB

[Gandi]

Hi,

 

I need to get all Entities which are inside, or partially inside a bounding box.

Is there a fast way of archieving this (also entities without any collission or bodies would be great).

[Rick]

I use http://www.leadwerks...tyinaabbdo-r164

 

If doing this from C++ I pass in a pointer to the class that calls this function to the extra parameter. Then inside the C function, that you have to specify as the callback, I cast back the extra pointer to the class and expose a public method that adds an entity to a list inside that class. Then after this function is finished being called my list is populated and I can use it.

 

Something like below. It's from memory so I might have screwed something up but you get the idea.

void _stdcall myfunc( TEntity entity, byte* extra)
{
MyClass* cls = (MyClass*)extra;
cls->AddEntity(entity);
}

class MyClass
{
private:
list<TEntity> _entities;
public:
void AddEntity(TEntity e) { _entities.push_back(e); }
void Update()
{
 _entities.clear();

 ForEachEntityInAABBDo(aabb, myfunc, this, ENTITY_ALL)

  // now my _entities list is populated
}
};