PxCollection#

Defined in include/common/PxCollection.h

class PxCollection#

Collection class for serialization.

A collection is a set of PxBase objects. PxBase objects can be added to the collection regardless of other objects they depend on. Objects may be named using PxSerialObjectId values in order to resolve dependencies between objects of different collections.

Serialization and deserialization only work through collections.

A scene is typically serialized using the following steps:

create a serialization registry
create a collection for scene objects
complete the scene objects (adds all dependent objects, e.g. meshes)
serialize collection
release collection
release serialization registry

For example the code may look like this:

PxPhysics* physics; // The physics
PxScene* scene;     // The physics scene
SerialStream s;     // The user-defined stream doing the actual write to disk

PxSerializationRegistry* registry = PxSerialization::createSerializationRegistry(*physics); // step 1)
PxCollection* collection = PxSerialization::createCollection(*scene);                       // step 2)
PxSerialization::complete(*collection, *registry);                                          // step 3)
PxSerialization::serializeCollectionToBinary(s, *collection, *registry);                    // step 4)
collection->release();                                                                      // step 5)
registry->release();                                                                        // step 6)

A scene is typically deserialized using the following steps:

load a serialized collection into memory
create a serialization registry
create a collection by passing the serialized memory block
add collected objects to scene
release collection
release serialization registry

For example the code may look like this:

PxPhysics* physics; // The physics
PxScene* scene;     // The physics scene
void* memory128;    // a 128-byte aligned buffer previously loaded from disk by the user    - step 1)

PxSerializationRegistry* registry = PxSerialization::createSerializationRegistry(*physics);     // step 2)
PxCollection* collection = PxSerialization::createCollectionFromBinary(memory128, *registry);   // step 3)
scene->addCollection(*collection);                                                              // step 4)
collection->release();                                                                          // step 5)
registry->release();                                                                            // step 6)

See also

PxBase, PxCreateCollection()

Public Functions

virtual void add( PxBase &object, PxSerialObjectId id = PX_SERIAL_OBJECT_ID_INVALID, ) = 0#

Adds a PxBase object to the collection.

Adds a PxBase object to the collection. Optionally a PxSerialObjectId can be provided in order to resolve dependencies between collections. A PxSerialObjectId value of PX_SERIAL_OBJECT_ID_INVALID means the object remains without id. Objects can be added regardless of other objects they require. If the object is already in the collection, the ID will be set if it was PX_SERIAL_OBJECT_ID_INVALID previously, otherwise the operation fails.

Parameters:

object – [in] Object to be added to the collection
id – [in] Optional PxSerialObjectId id

virtual void remove(PxBase &object) = 0#

Removes a PxBase member object from the collection.

Object needs to be contained by the collection.

Parameters:: object – [in] PxBase object to be removed

virtual bool contains(PxBase &object) const = 0#

Returns whether the collection contains a certain PxBase object.

Parameters:: object – [in] PxBase object
Returns:: Whether object is contained.

virtual void addId(PxBase &object, PxSerialObjectId id) = 0#

Adds an id to a member PxBase object.

If the object is already associated with an id within the collection, the id is replaced. May only be called for objects that are members of the collection. The id needs to be unique within the collection.

Parameters:

object – [in] Member PxBase object
id – [in] PxSerialObjectId id to be given to the object

virtual void removeId(PxSerialObjectId id) = 0#

Removes id from a contained PxBase object.

May only be called for ids that are associated with an object in the collection.

Parameters:: id – [in] PxSerialObjectId value

virtual void add(PxCollection &collection) = 0#

Adds all PxBase objects and their ids of collection to this collection.

PxBase objects already in this collection are ignored. Object ids need to be conflict free, i.e. the same object may not have two different ids within the two collections.

Parameters:: collection – [in] Collection to be added

virtual void remove(PxCollection &collection) = 0#

Removes all PxBase objects of collection from this collection.

PxBase objects not present in this collection are ignored. Ids of objects which are removed are also removed.

Parameters:: collection – [in] Collection to be removed

virtual PxU32 getNbObjects() const = 0#

Gets number of PxBase objects in this collection.

Returns:: Number of objects in this collection

virtual PxBase &getObject(PxU32 index) const = 0#

Gets the PxBase object of this collection given its index.

Parameters:: index – [in] PxBase index in [0, getNbObjects())
Returns:: PxBase object at index index

virtual PxU32 getObjects(

PxBase **userBuffer,

PxU32 bufferSize,

PxU32 startIndex = 0,

) const = 0#

Copies member PxBase pointers to a user specified buffer.

Parameters:

userBuffer – [out] Array of PxBase pointers
bufferSize – [in] Capacity of userBuffer
startIndex – [in] Offset into list of member PxBase objects

Returns:

number of members PxBase objects that have been written to the userBuffer

virtual PxBase *find(PxSerialObjectId id) const = 0#

Looks for a PxBase object given a PxSerialObjectId value.

If there is no PxBase object in the collection with the given id, NULL is returned.

Parameters:: id – [in] PxSerialObjectId value to look for
Returns:: PxBase object with the given id value or NULL

virtual PxU32 getNbIds() const = 0#

Gets number of PxSerialObjectId names in this collection.

Returns:: Number of PxSerialObjectId names in this collection

virtual PxU32 getIds( PxSerialObjectId *userBuffer, PxU32 bufferSize, PxU32 startIndex = 0, ) const = 0#

Copies member PxSerialObjectId values to a user specified buffer.

Parameters:

userBuffer – [out] Array of PxSerialObjectId values
bufferSize – [in] Capacity of userBuffer
startIndex – [in] Offset into list of member PxSerialObjectId values

Returns:

number of members PxSerialObjectId values that have been written to the userBuffer

virtual PxSerialObjectId getId(const PxBase &object) const = 0#

Gets the PxSerialObjectId name of a PxBase object within the collection.

The PxBase object needs to be a member of the collection.

Parameters:: object – [in] PxBase object to get id for
Returns:: PxSerialObjectId name of the object or PX_SERIAL_OBJECT_ID_INVALID if the object is unnamed

virtual void release() = 0#

Deletes a collection object.

This function only deletes the collection object, i.e. the container class. It doesn’t delete objects that are part of the collection.