It's possible to query the physics system to get all the physical objects/entities contained into a specific box volume defined by a minimum and a maximum point.
For achieving this result you can use the function GetEntitiesInBox:
virtual int GetEntitiesInBox(Vec3 ptmin,Vec3 ptmax, IPhysicalEntity **&pList, int objtypes, int szListPrealloc=0) = 0;... as follows:
IPhysicalEntity** entityList = 0;
int entityCount = gEnv->pPhysicalWorld->GetEntitiesInBox(m_volume.min, m_volume.max, entityList,
ent_static | ent_terrain | ent_sleeping_rigid | ent_rigid);The function GetEntitiesInBox returns the number of entities found and receives the following parameters:
Parameter | Description |
|---|---|
ptmin | Minimum point in the space that defines the desired box volume. |
ptmas | Maximum point in the space that defines the desired box volume. |
pList | Pointer to a list of objects that will be filled by the function. |
objtypes | Types of objects that need to be considered in the query. |
szListPrealloc | If specified it's the maximum number of objects contained by the pList array. |
The possible object types are described into the header physinterface.h in the entity_query_flags enumerators. Some of the possibilities are:
Entity type flag | Description |
|---|---|
ent_static | Static entities |
ent_terrain | Terrain |
ent_sleeping_rigid | Sleeping rigid bodies |
ent_rigid | Rigid bodies |
... | Others |
At this point you can easily iterate through the objects and perform the desired operations
for (int i = 0; i < entityCount; \++i)
{
IPhysicalEntity\* entity = entityList[i];
[...]
if (entity->GetType() == PE_RIGID)
{
[...]
}
[...]
}