Gameobject

Namespace: dmGameObject Language: C++ Type: Defold C++ File: gameobject.h Source: engine/gameobject/src/dmsdk/gameobject/gameobject.h Include: dmsdk/gameobject/gameobject.h

API for manipulating game objects

API

AcquireInstanceIndex

Type: FUNCTION Retrieve an instance index from the index pool for the collection.

Parameters

• collection (dmGameObject::HColleciton) - Collection from which to retrieve the instance index.

Returns

• instance (uint32_t) - index from the index pool of collection.

AddDynamicResourceHash

Type: FUNCTION Adds a reference to a dynamically created resource into the collection. If the resource is not released before the collection is being destroyed, the collection will automatically free the resource.

Parameters

• collection (HCollection) - Collection handle
• path_hash (dmhash_t) - resource path hash

AssignInstanceIndex

Type: FUNCTION Assign an index to the instance, only if the instance is not null.

Parameters

• index (uint32_t) - The index to assign.
• instance (dmGameObject::HInstance) - The instance that should be assigned the index.

CreateInstanceId

Type: FUNCTION Creates a new unique instance ID and returns its hash.

Returns

• id (dmhash_t) - hash of the new unique instance id

CreateResult

Type: ENUM Create result enum.

Members

• dmGameObject::CREATE_RESULT_OK
• dmGameObject::CREATE_RESULT_UNKNOWN_ERROR

Delete

Type: FUNCTION Delete gameobject instance

Parameters

• collection (dmGameObject::HCollection) - Gameobject collection
• instance (dmGameObject::HInstance) - Gameobject instance
• recursive (bool) - If true, delete child hierarchy recursively in child to parent order (leaf first)

DeleteBones

Type: FUNCTION Recursively delete all instances flagged as bones under the given parent instance. The order of deletion is depth-first, so that the children are deleted before the parents.

Parameters

• parent (HInstance) - Parent instance of the hierarchy

GetAbsoluteIdentifier

Type: FUNCTION Get absolute identifier relative to instance. The returned identifier is the representation of the qualified name, i.e. the path from root-collection to the sub-collection which the instance belongs to. Example: if the instance is part of a sub-collection in the root-collection named “sub” and id == “a” the returned identifier represents the path “sub.a”

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance to get absolute identifier to
• identifier (const char*) - Identifier relative to instance

Returns

• return (dmhash_t) - Absolute identifier.

GetCollection

Type: FUNCTION Retrieve a collection from the specified instance

Parameters

• instance (dmGameObject::HInstance) - Game object instance

Returns

• collection (dmGameObject::HInstance) - The collection the specified instance belongs to

GetCollectionByHash

Type: FUNCTION Retrieve a collection by socket name hash Note: in native extensions, the register can be retrieved during init using dmEngine::GetGameObjectRegister(dmExtension::AppParams *params)

Parameters

• regist (dmGameObject::HRegister) - Register
• socket_name (dmhash_t) - The socket name

Returns

• collection (dmGameObject::HCollection) - The collection if successful. 0 otherwise.

GetComponent

Type: FUNCTION Get the component, component type and its world

Parameters

• instance (dmGameObject::HInstance) - Instance
• component_id (dmhash_t) - Component id
• component_type (uint32_t*) - (out) Component type. Used for validation.
• component (HComponent*) - (out) The component.
• world (HComponentWorld*) - (out) The component world. May be 0.

Returns

• result (dmGameObject::Result) - RESULT_OK if the component was found

GetComponentId

Type: FUNCTION Get component id from component index.

Parameters

• instance (dmGameObject::HInstance) - Instance
• component_index (uint16_t) - Component index
• component_id (dmhash_t*) - Component id as out-argument

Returns

• result (dmGameObject::Result) - RESULT_OK if the component was found

GetComponentTypeIndex

Type: FUNCTION Get the component type index

Parameters

• collection (HCollection) - Collection handle
• type_hash (dmhash_t) - The hashed name of the registered component type (e.g. dmHashString(“guic”))

Returns

• type_index (uint32_t) - The component type index. 0xFFFFFFFF if not found

GetContext

Type: FUNCTION Retrieve the context for a component type

Parameters

• collection (HCollection) - Collection handle
• component_type_index (uint32_t) - index of the component type

Returns

• context (void*) - The pointer to the context, 0x0 if not found

GetIdentifier

Type: FUNCTION Get instance identifier

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmhash_t) - Identifier. dmGameObject::UNNAMED_IDENTIFIER if not set.

GetInstanceFromIdentifier

Type: FUNCTION Get instance from identifier

Parameters

• collection (dmGameObject::HCollection) - Collection
• identifier (dmhash_t) - Identifier

Returns

• instance (dmGameObject::HInstance) - Instance. NULL if instance isn’t found.

GetMessageSocket

Type: FUNCTION Retrieve the message socket for the specified collection.

Parameters

• collection (dmGameObject::HCollection) - Collection handle

Returns

• socket (dmMessage::HSocket) - The message socket of the specified collection

GetPosition

Type: FUNCTION Get gameobject instance position

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmVMath::Point3) - Position

GetPropertyAsBool

Type: FUNCTION Retrieve a boolean property from a component.

Parameters

• instance (HInstance) - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• out_value (bool*) - The retrieved property value

Returns

• PROPERTY_RESULT_OK - if the out-parameter was written

GetPropertyAsFloat

Type: FUNCTION Retrieve a float property from a component.

Parameters

• instance (HInstance) - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• out_value (float*) - The retrieved property value

Returns

• PROPERTY_RESULT_OK - if the out-parameter was written

GetPropertyAsHash

Type: FUNCTION Retrieve a hash property from a component.

Parameters

• instance (HInstance) - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• out_value (dmhash_t*) - The retrieved property value

Returns

• PROPERTY_RESULT_OK - if the out-parameter was written

GetPropertyAsMatrix

Type: FUNCTION Retrieve a matrix4 property from a component.

Parameters

• instance (HInstance) - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• out_value (dmGameObject::Matrix4*) - The retrieved property value

Returns

• PROPERTY_RESULT_OK - if the out-parameter was written

GetPropertyAsQuat

Type: FUNCTION Retrieve a quaternion property from a component.

Parameters

• instance (HInstance) - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• out_value (dmVMath::Quat*) - The retrieved property value

Returns

• PROPERTY_RESULT_OK - if the out-parameter was written

GetPropertyAsURL

Type: FUNCTION Retrieve a url property from a component.

Parameters

• instance (HInstance) - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• out_value (dmMessage::URL*) - The retrieved property value

Returns

• PROPERTY_RESULT_OK - if the out-parameter was written

GetPropertyAsVector3

Type: FUNCTION Retrieve a vector3 property from a component.

Parameters

• instance (HInstance) - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• out_value (dmVMath::Vector3*) - The retrieved property value

Returns

• PROPERTY_RESULT_OK - if the out-parameter was written

GetPropertyAsVector4

Type: FUNCTION Retrieve a vector4 property from a component.

Parameters

• instance (HInstance) - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• out_value (dmVMath::Vector4*) - The retrieved property value

Returns

• PROPERTY_RESULT_OK - if the out-parameter was written

GetPropertyOptionsCount

Type: FUNCTION Get the property count from a PropertyOptions container

Parameters

• options (HPropertyOptions) - Options handle

Returns

• count (uint32_t) - The number of property options

GetPropertyOptionsIndex

Type: FUNCTION Get the index value from a property option at a specific index

Parameters

• options (HPropertyOptions) - Options handle
• options_index (int32_t) - The options index into the property options container
• result (int32_t*) - If the option at the index is valid, store the result. Pointer is untouched otherwise

Returns

• PROPERTY_RESULT_OK - if the property option at the index is valid

GetPropertyOptionsKey

Type: FUNCTION Get the key value from a property option at a specific index

Parameters

• options (HPropertyOptions) - Options handle
• options_index (int32_t) - The options index into the property options container
• result (dmhash_t*) - If the option at the index is valid, store the result. Pointer is untouched otherwise

Returns

• PROPERTY_RESULT_OK - if the property option at the index is valid

GetRotation

Type: FUNCTION Get gameobject instance rotation

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmGameObject::Quat) - rotation

GetScale

Type: FUNCTION Get gameobject instance scale

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmGameObject::Vector3) - Non-uniform scale

GetUniformScale

Type: FUNCTION Get gameobject instance uniform scale

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (float) - Uniform scale

GetWorld

Type: FUNCTION Retrieve the world in the collection connected to the supplied component

Parameters

• collection (HCollection) - Collection handle
• component_type_index (uint32_t) - index of the component type

Returns

• world (void*) - The pointer to the world, 0x0 if not found

GetWorldMatrix

Type: FUNCTION Get game object instance world transform as Matrix4.

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmGameObject::Matrix4) - World transform matrix.

GetWorldPosition

Type: FUNCTION Get gameobject instance world position

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmGameObject::Point3) - World position

GetWorldRotation

Type: FUNCTION Get gameobject instance world rotation

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmGameObject::Quat) - World rotation

GetWorldScale

Type: FUNCTION Get game object instance world transform

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmGameObject::Vector3) - World scale

GetWorldTransform

Type: FUNCTION Get game object instance world transform

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (dmTransform::Transform) - World transform

GetWorldUniformScale

Type: FUNCTION Get game object instance uniform scale

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance

Returns

• return (float) - World uniform scale

HCollection

Type: TYPEDEF Gameobject collection handle

HComponent

Type: TYPEDEF Opaque handle to component instance

HComponentInternal

Type: TYPEDEF Opaque handle to internal representation of a component instance

HComponentWorld

Type: TYPEDEF Opaque handle to a component world

HInstance

Type: TYPEDEF Gameobject instance handle

HProperties

Type: TYPEDEF Gameobject properties handle

HPropertyContainer

Type: TYPEDEF Handle to a list of properties (gameobject_props.h)

HPropertyOptions

Type: TYPEDEF Handle to a list of property options

HPrototype

Type: TYPEDEF Gameobject prototype handle

HRegister

Type: TYPEDEF Collection register.

HScript

Type: TYPEDEF Script handle

HScriptInstance

Type: TYPEDEF Script instance handle

InputAction

Type: STRUCT Container of input related information.

InputResult

Type: ENUM Input result enum

Members

• INPUT_RESULT_IGNORED - = 0
• INPUT_RESULT_CONSUMED - = 1
• INPUT_RESULT_UNKNOWN_ERROR - = -1000

InstanceIdMap

Type: TYPEDEF Used for mapping instance ids from a collection definition to newly spawned instances

InstancePropertyContainers

Type: TYPEDEF Contains property containers for game objects to be spawned

INVALID_INSTANCE_POOL_INDEX

Type: CONSTANT Value for an invalid instance index, this must be the same as defined in gamesys_ddf.proto for Create#index.

IsBone

Type: FUNCTION Check whether the instance is flagged as a bone.

Parameters

• instance (HInstance) - Instance

Returns

• result (bool) - True if flagged as a bone

New

Type: FUNCTION Create a new gameobject instance

Notes

• Calling this function during update is not permitted. Use #Spawn instead for deferred creation

Parameters

• collection (dmGameObject::HCollection) - Gameobject collection
• prototype_name (const char*) - Prototype file name. May be 0.

Returns

• instance (dmGameObject::HInstance) - New gameobject instance. NULL if any error occured

Playback

Type: ENUM Playback type enum

PropertyDesc

Type: STRUCT Description of a property. If the property is externally mutable, m_ValuePtr points to the value and its length is m_ElementCount. m_Variant always reflects the value.

Members

• m_ElementIds (dmhash_t) - For composite properties (float arrays), these ids name each element
• m_Variant (PropertyVar) - Variant holding the value
• m_ValuePtr (float*) - Pointer to the value, only set for mutable values. The actual data type is described by the variant.
• m_ReadOnly (uint16_t) - Determines whether we are permitted to write to this property.
• m_ValueType (uint16_t) - Indicates type of the property (of type PropertyValueType).
• m_ArrayLength (uint16_t) - Number of array entries, if the property is an array and zero otherwise. Max supported length is 2^14 (16384 elements)

PropertyResult

Type: ENUM Property result.

Members

• dmGameObject::PROPERTY_RESULT_OK
• dmGameObject::PROPERTY_RESULT_NOT_FOUND
• dmGameObject::PROPERTY_RESULT_INVALID_FORMAT
• dmGameObject::PROPERTY_RESULT_UNSUPPORTED_TYPE
• dmGameObject::PROPERTY_RESULT_TYPE_MISMATCH
• dmGameObject::PROPERTY_RESULT_COMP_NOT_FOUND
• dmGameObject::PROPERTY_RESULT_INVALID_INSTANCE
• dmGameObject::PROPERTY_RESULT_BUFFER_OVERFLOW
• dmGameObject::PROPERTY_RESULT_UNSUPPORTED_VALUE
• dmGameObject::PROPERTY_RESULT_UNSUPPORTED_OPERATION
• dmGameObject::PROPERTY_RESULT_RESOURCE_NOT_FOUND
• dmGameObject::PROPERTY_RESULT_INVALID_INDEX
• dmGameObject::PROPERTY_RESULT_INVALID_KEY
• dmGameObject::PROPERTY_RESULT_READ_ONLY

PropertyType

Type: ENUM Property types.

Members

• dmGameObject::PROPERTY_TYPE_NUMBER
• dmGameObject::PROPERTY_TYPE_HASH
• dmGameObject::PROPERTY_TYPE_URL
• dmGameObject::PROPERTY_TYPE_VECTOR3
• dmGameObject::PROPERTY_TYPE_VECTOR4
• dmGameObject::PROPERTY_TYPE_QUAT
• dmGameObject::PROPERTY_TYPE_BOOLEAN
• dmGameObject::PROPERTY_TYPE_COUNT

PropertyValueType

Type: ENUM Type of property value

Members

• dmGameObject::PROP_VALUE_ARRAY
• dmGameObject::PROP_VALUE_HASHTABLE

PropertyVar

Type: STRUCT Property variant that holds the data for a variable

Members

• m_Type (dmGameObject::PropertyType) - property type
• m_Number (double) - A floating point value (union)
• m_Hash (dmhash_t) - A hash value (union)
• m_Url (const uin8_t*) - An URL value (union)
• m_V4 (float) - A vector4 value (union)
• m_Bool (bool) - A boolean value (union)

Result

Type: ENUM Result enumeration.

Members

• dmGameObject::RESULT_OK
• dmGameObject::RESULT_OUT_OF_RESOURCES
• dmGameObject::RESULT_ALREADY_REGISTERED
• dmGameObject::RESULT_IDENTIFIER_IN_USE
• dmGameObject::RESULT_IDENTIFIER_ALREADY_SET
• dmGameObject::RESULT_COMPONENT_NOT_FOUND
• dmGameObject::RESULT_MAXIMUM_HIEARCHICAL_DEPTH
• dmGameObject::RESULT_INVALID_OPERATION
• dmGameObject::RESULT_RESOURCE_TYPE_NOT_FOUND
• dmGameObject::RESULT_BUFFER_OVERFLOW
• dmGameObject::RESULT_IDENTIFIER_INVALID
• dmGameObject::RESULT_RESOURCE_ERROR
• dmGameObject::RESULT_CHILD_NOT_FOUND
• dmGameObject::RESULT_INVALID_PROPERTIES
• dmGameObject::RESULT_UNABLE_TO_CREATE_COMPONENTS
• dmGameObject::RESULT_UNABLE_TO_INIT_INSTANCE
• dmGameObject::RESULT_UNKNOWN_ERROR

SceneNode

Type: STRUCT Opaque struct that holds info about the current node

Notes

• The concept of a scene node only exists here, for the purposes of inspecting the scene graph for inspection and testing purposes only.

SceneNodeIterator

Type: STRUCT Opaque struct that holds info about the current position when traversing the scene

SceneNodeProperty

Type: STRUCT Struct that holds info about the current position when traversing the scene

Members

• m_NameHash (dmhash_t) - name
• m_Type (dmGameObject::SceneNodePropertyType) - type
• m_Value (union) - value

m_Number

[type:double] floating point number

m_Hash

[type:dmhash_t] The hashed value.

m_URL

[type:char[1024]] The text representation of the url (if reverse hashes are enabled)

m_V4

[type:float[4]] Used for Vector3, Vector4 and Quat

m_Bool

[type:bool] A boolean value

m_Text

[type:const char*] Text from a text property

SceneNodePropertyIterator

Type: STRUCT Holds the property

Members

• m_Property (dmGameObject::SceneNodeProperty) - property

SceneNodePropertyType

Type: ENUM scene node property types

Notes

• Since we don’t support text properties, we’ll keep a separate enum here for now

Members

• dmGameObject::SCENE_NODE_PROPERTY_TYPE_NUMBER
• dmGameObject::SCENE_NODE_PROPERTY_TYPE_HASH
• dmGameObject::SCENE_NODE_PROPERTY_TYPE_URL
• dmGameObject::SCENE_NODE_PROPERTY_TYPE_VECTOR3
• dmGameObject::SCENE_NODE_PROPERTY_TYPE_VECTOR4
• dmGameObject::SCENE_NODE_PROPERTY_TYPE_QUAT
• dmGameObject::SCENE_NODE_PROPERTY_TYPE_BOOLEAN
• dmGameObject::SCENE_NODE_PROPERTY_TYPE_TEXT
• dmGameObject::SCENE_NODE_PROPERTY_TYPE_COUNT

SetBone

Type: FUNCTION Set whether the instance should be flagged as a bone. Instances flagged as bones can have their transforms updated in a batch through SetBoneTransforms. Used for animated skeletons.

Parameters

• instance (HInstance) - Instance
• bone (bool) - true if the instance is a bone

SetBoneTransforms

Type: FUNCTION Set the local transforms recursively of all instances flagged as bones, starting with component with id. The order of the transforms is depth-first.

Parameters

• instance (HInstance) - First Instance of the hierarchy to set
• component_transform (dmTransform::Transform) - the transform for component root
• transforms (dmTransform::Transform*) - Array of transforms to set depth-first for the bone instances
• transform_count (uint32_t) - Size of the transforms array

Returns

• Number - of instances found

SetIdentifier

Type: FUNCTION Set instance identifier. Must be unique within the collection.

Parameters

• collection (dmGameObject::HCollection) - Collection
• instance (dmGameObject::HInstance) - Instance
• identifier (dmhash_t) - Identifier

Returns

• result (dmGameObject::Result) - RESULT_OK on success

SetPosition

Type: FUNCTION Set gameobject instance position

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance
• position (dmVMath::Point3) - New Position

SetPropertyFromBool

Type: FUNCTION Sets the value of a boolean property on a component.

Parameters

• instance - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• value (bool) - Value of the property

Returns

• PROPERTY_RESULT_OK - if the value could be set

SetPropertyFromHash

Type: FUNCTION Sets the value of a hash property on a component.

Parameters

• instance - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• value (dmhash_t) - Value of the property

Returns

• PROPERTY_RESULT_OK - if the value could be set

SetPropertyFromHash

Type: FUNCTION Sets the value of a float property on a component.

Parameters

• instance - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• value (float) - Value of the property

Returns

• PROPERTY_RESULT_OK - if the value could be set

SetPropertyFromMatrix4

Type: FUNCTION Sets the value of a matrix4 property on a component.

Parameters

• instance - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• value (dmVMath::Matrix4) - Value of the property

Returns

• PROPERTY_RESULT_OK - if the value could be set

SetPropertyFromQuat

Type: FUNCTION Sets the value of a quaternion property on a component.

Parameters

• instance - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• value (dmVMath::Quat) - Value of the property

Returns

• PROPERTY_RESULT_OK - if the value could be set

SetPropertyFromURL

Type: FUNCTION Sets the value of a URL property on a component.

Parameters

• instance - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• value (dmMessage::URL) - Value of the property

Returns

• PROPERTY_RESULT_OK - if the value could be set

SetPropertyFromVector3

Type: FUNCTION Sets the value of a vector3 property on a component.

Parameters

• instance - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• value (dmVMath::vector3) - Value of the property

Returns

• PROPERTY_RESULT_OK - if the value could be set

SetPropertyFromVector4

Type: FUNCTION Sets the value of a vector4 property on a component.

Parameters

• instance - Instance of the game object
• component_id (dmhash_t) - Id of the component
• property_id (dmhash_t) - Id of the property
• value (dmVMath::Vector4) - Value of the property

Returns

• PROPERTY_RESULT_OK - if the value could be set

SetRotation

Type: FUNCTION Set gameobject instance rotation

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance
• rotation (dmVmath::Quat) - New rotation

SetScale

Type: FUNCTION Set gameobject instance uniform scale

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance
• scale (float) - New uniform scale

SetScale

Type: FUNCTION Set gameobject instance non-uniform scale

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance
• scale (dmVmath::Vector3) - New non-uniform scale

SetScaleXY

Type: FUNCTION Set gameobject instance x and y scale

Parameters

• instance (dmGameObject::HInstance) - Gameobject instance
• scale_x - New x scale
• scale_y - New y scale

Spawn

Type: FUNCTION Spawns a new gameobject instance. The actual creation is performed after the update is completed.

Parameters

• collection (HCollection) - Gameobject collection
• prototype (HPrototype) - Prototype
• prototype_name (const char*) - Prototype file name (.goc)
• id (dmhash_t) - Id of the spawned instance
• properties (HPropertyContainer) - Container with override properties
• position (dmVMath::Vector3) - Position of the spawed object
• rotation (dmVMath::Quat) - Rotation of the spawned object
• scale (dmVMath::Vector3) - Scale of the spawned object return instance HInstance the spawned instance, 0 at failure

TraverseGetRoot

Type: FUNCTION Gets the top node of the whole game (the main collection)

Notes

• The dmGameObject::HRegister is obtained from the dmEngine::GetGameObjectRegister(dmExtension::AppParams)
• Traversing the scene like this is not efficient. These functions are here for inspection and testing purposes only.

Parameters

• regist (dmGameObject::HRegister) - the full gameobject register
• node (dmGameObject::HRegister) - the node to inspect

Returns

• result (bool) - True if successful

Examples

The following examples show how to iterate over currently loaded scene graph

void OutputNode(dmGameObject::SceneNode* node) {
    dmGameObject::SceneNodeIterator it = dmGameObject::TraverseIterateChildren(node);
    while(dmGameObject::TraverseIterateNext(&it))
    {
        OutputProperties(&it.m_Node); // see dmGameObject::TraverseIterateProperties()
        OutputNode(&it.m_Node);
    }
}

bool OutputScene(HRegister regist) {
    dmGameObject::SceneNode root;
    if (!dmGameObject::TraverseGetRoot(regist, &root))
        return false;
    OutputNode(&node);
}

TraverseIterateChildren

Type: FUNCTION Get a scene node iterator for the nodes’ children

Parameters

• node (dmGameObject::SceneNode*) - the parent node

Returns

• iterator (dmGameObject::SceneNodeIterator) - the iterator

TraverseIterateNext

Type: FUNCTION Step a scene node iterator to the next sibling

Parameters

• it (dmGameObject::SceneNodeIterator*) - the iterator

Returns

• result (bool) - true if successful. false if the iterator is finished

TraverseIterateProperties

Type: FUNCTION Create a scene node traversal property iterator

Notes

• Getting the properties like this is not efficient. These functions are here for inspection and testing purposes only.
• Reverse hashes via dmHashReverseSafe64() isn’t available in release builds.

Parameters

• node (dmGameObject::SceneNode*) - the node to inspect

Returns

• iterator (dmGameObject::SceneNodePropertyIterator) - the property iterator

Examples

The following examples show how to iterate over the properties of a node

dmGameObject::SceneNodePropertyIterator pit = TraverseIterateProperties(node);
while(dmGameObject::TraverseIteratePropertiesNext(&pit))
{
    const char* name = dmHashReverseSafe64(pit.m_Property.m_NameHash);
    switch(pit.m_Property.m_Type)
    {
    case dmGameObject::SCENE_NODE_PROPERTY_TYPE_NUMBER: ...
    ...
    }
}

TraverseIteratePropertiesNext

Type: FUNCTION Steps the scene node traversal property iterator to the next property

Parameters

• it (dmGameObject::SceneNodePropertyIterator*) - the iterator

Returns

• finished (bool) - True if the iterator it valid, false if the iterator is finished.

UpdateContext

Type: STRUCT Update context

Members

• m_TimeScale (float) - the scaling factor what was applied on the dt (i.e. the collection update time scale)
• m_DT (float) - the delta time elapsed since last frame (seconds)
• m_FixedUpdateFrequency (uint32_t) - Number of of calls per second to the FixedUpdate of each component

UpdateResult

Type: ENUM Update result enum.

Members

• dmGameObject::UPDATE_RESULT_OK
• dmGameObject::UPDATE_RESULT_UNKNOWN_ERROR