ParaEngine::VoxelTerrainEntity Class Reference

a voxel terrain entity uses a 3d grid to present a terrain mesh, such can have caves and overhangs on traditional height map terrains. More...

#include <VoxelTerrainEntity.h>

Inheritance diagram for ParaEngine::VoxelTerrainEntity:

Public Member Functions
void	Init (const char *filename)
	load the voxel entity from file. More...
IsoSurfaceRenderable *	GetIsoSurface ()
	Get the Iso surface object for rendering. More...
Public Member Functions inherited from ParaEngine::AssetEntity
	AssetEntity (const AssetKey &key)
	ATTRIBUTE_DEFINE_CLASS (AssetEntity)
virtual int	InstallFields (CAttributeClass *pClass, bool bOverride)
	this class should be implemented if one wants to add new attribute. More...
	ATTRIBUTE_METHOD1 (AssetEntity, GetLocalFileName_s, const char **)
	ATTRIBUTE_METHOD1 (AssetEntity, SetLocalFileName_s, const char *)
	ATTRIBUTE_METHOD1 (AssetEntity, GetRemoteAssetURL_s, const char **)
	ATTRIBUTE_METHOD1 (AssetEntity, IsValid_s, bool *)
	ATTRIBUTE_METHOD1 (AssetEntity, IsLoaded_s, bool *)
	ATTRIBUTE_METHOD1 (AssetEntity, IsLocked_s, bool *)
	ATTRIBUTE_METHOD1 (AssetEntity, IsInitialized_s, bool *)
	ATTRIBUTE_METHOD1 (AssetEntity, GetState_s, int *)
	ATTRIBUTE_METHOD1 (AssetEntity, SetState_s, int)
virtual AssetType	GetType ()
virtual const std::string &	GetIdentifier ()
virtual bool	AutoSync (bool bForceSync=false, bool bLazyLoading=true)
	call this function to automatically sync with the remote server according to current asset state More...
virtual void	Refresh (const char *sFilename=NULL, bool bLazyLoad=false)
	refresh the asset from local disk. More...
virtual const string &	GetLocalFileName ()
	the actual local file name. More...
virtual void	SetLocalFileName (const char *sFileName)
virtual string	GetRemoteAssetURL ()
	get the remote server url of this asset. More...
virtual CParameterBlock *	GetParamBlock (bool bCreateIfNotExist=false)
	get effect parameter block with this object. More...
bool	IsValid ()
	whether this is a valid resource object. More...
bool	IsInitialized ()
	whether initialized. More...
virtual bool	IsLoaded ()
	most assets are loaded asynchronously. More...
virtual int	Release ()
	call this function to safely release this asset. More...
AssetKey &	GetKey ()
	return the key object. More...
AssetState	GetState ()
	return the asset state. More...
void	SetState (AssetState state)
	set the asset state. More...
virtual IAttributeFields *	GetAttributeObject ()
	get the attribute object of this asset. More...
virtual HRESULT	InitDeviceObjects ()
virtual HRESULT	RestoreDeviceObjects ()
virtual HRESULT	InvalidateDeviceObjects ()
virtual HRESULT	DeleteDeviceObjects ()
virtual HRESULT	RendererRecreated ()
	callback of listening the event that renderer was recreated on Android/WP8 all opengl related id has already become invalid at this time, no need to release them, just recreate them all in this function.
virtual void	Cleanup ()
	Clean up additional resources. More...
void	LoadAsset ()
	load asset. More...
void	UnloadAsset ()
	unload asset. More...
void	GarbageCollectMe ()
	if its reference count is zero, unload this asset object. More...
bool	IsLocked ()
	whether this is a locked resource resource. More...
virtual bool	Lock (int nMethod=0)
	Lock the object. More...
virtual void	UnLock ()
	UnLock the object.
virtual bool	GetBoundingBox (Vector3 *pMin, Vector3 *pMax)
	Get AABB bounding box of the asset object. More...
Public Member Functions inherited from ParaEngine::IAttributeFields
virtual int	GetAttributeClassID ()
	attribute class ID should be identical, unless one knows how overriding rules work. More...
virtual const char *	GetAttributeClassName ()
	a static string, describing the attribute class object's name
virtual const char *	GetAttributeClassDescription ()
	a static string, describing the attribute class object
virtual int	GetChildAttributeColumnCount ()
	we support multi-dimensional child object. More...
virtual int	GetChildAttributeObjectCount (int nColumnIndex=0)
	get the number of child objects (row count) in the given column. More...
virtual IAttributeFields *	GetChildAttributeObject (int nRowIndex, int nColumnIndex=0)
virtual IAttributeFields *	GetChildAttributeObject (const std::string &sName)
	get attribute by child object. More...
	ATTRIBUTE_METHOD1 (IAttributeFields, GetName_s, const char **)
	ATTRIBUTE_METHOD1 (IAttributeFields, SetName_s, const char *)
	ATTRIBUTE_METHOD (IAttributeFields, PrintObject_s)
	ATTRIBUTE_METHOD (IAttributeFields, AddRef_s)
	ATTRIBUTE_METHOD1 (IAttributeFields, GetRefCount_s, int *)
	ATTRIBUTE_METHOD1 (IAttributeFields, SetTime_s, int)
	ATTRIBUTE_METHOD1 (IAttributeFields, GetTime_s, int *)
	ATTRIBUTE_METHOD (IAttributeFields, Release_s)
virtual void	SetIdentifier (const std::string &sID)
virtual bool	IsModified ()
	whether some of the fields are modified.It is up to the implementation class to provide this functionality if necessary. More...
virtual void	SetModified (bool bModified)
	set whether any field has been modified. More...
virtual bool	ValidateFields ()
	validate all fields and return true if validation passed. More...
virtual string	GetValidationMessage ()
	get the recent validation message due to the most recent call to ValidateFields()
virtual bool	ResetField (int nFieldID)
	Reset the field to its initial or default value. More...
virtual bool	InvokeEditor (int nFieldID, const std::string &sParameters)
	Invoke an (external) editor for a given field. More...
virtual bool	AddChildAttributeObject (IAttributeFields *pChild, int nRowIndex=-1, int nColumnIndex=0)
	add child object. More...
virtual void *	QueryObjectByName (const std::string &sObjectType)
	convert to object of a given type. More...
virtual void *	QueryObject (int nObjectType)
	convert to object of a given type. More...
virtual int	GetTime ()
	get the current local time in case it is animated in milli seconds frames. More...
virtual void	SetTime (int nTime)
virtual CDynamicAttributeField *	GetDynamicField (const std::string &sName)
	Get a dynamic field with a given name. More...
virtual CDynamicAttributeField *	GetDynamicField (int nIndex)
	Get a dynamic field with a given index. More...
virtual const char *	GetDynamicFieldNameByIndex (int nIndex)
	get field name by index
virtual int	GetDynamicFieldCount ()
	how many dynamic field this object currently have. More...
virtual int	SetDynamicField (const std::string &sName, const CVariable &value)
	set a dynamic field with a given name. More...
virtual int	AddDynamicField (const std::string &sName, ATTRIBUTE_FIELDTYPE dwType)
	add dynamic field and return field index
virtual void	RemoveAllDynamicFields ()
	remove all dynamic fields
virtual int	SaveDynamicFieldsToString (std::string &output)
	save only text dynamic fields to fieldname = value text strings. More...
virtual int	LoadDynamicFieldsFromString (const std::string &input)
	load only text dynamic fields from string More...
CAttributeClass *	GetAttributeClass ()
	get the main attribute class object. More...
void	PrintObject ()
	print the content of this object to a text file at temp/doc/[ClassName].txt. More...
Public Member Functions inherited from ParaEngine::IObject
virtual void	Clone (IObject *obj) const
	Clone the object's contains to a pointer. More...
virtual IObject *	Clone () const
	Clone the object's contains and return a pointer to the newly created object. More...
virtual bool	Equals (const IObject *obj) const
	Compare the object with another object. More...
virtual const IType *	GetType () const
virtual std::string	ToString () const
WeakPtr_type &	GetWeakReference ()
	get weak reference object. More...
virtual int	ProcessObjectEvent (const ObjectEvent &event)
	this function is only used to backward compatibility of ParaObject:AddEvent() function. More...
Public Member Functions inherited from ParaEngine::CRefCounted
void	addref () const
	add reference count of the object. More...
bool	delref () const
	decrease reference count of the object. More...
int	GetRefCount () const
	get the reference count
CRefCounted *	AddToAutoReleasePool ()
	addref and releases the ownership sometime soon automatically (usually at the end of the current frame). More...

Public Attributes
DataGridPtr	m_pDataGrid
	this is only created when a voxel entity is being manually edited by the user. More...
Public Attributes inherited from ParaEngine::AssetEntity
AssetKey	m_key
	this is the unique key object. More...
bool	m_bIsInitialized
	whether this entity is initialized;Entity is by default lazily initialized
bool	m_bIsValid
	whether this is a valid resource object. More...

Additional Inherited Members
Public Types inherited from ParaEngine::AssetEntity
enum	AssetState {   ASSET_STATE_NORMAL, ASSET_STATE_LOCAL, ASSET_STATE_REMOTE, ASSET_STATE_CACHE,   ASSET_STATE_SYNC_START, ASSET_STATE_SYNC_SUCCEED, ASSET_STATE_SYNC_FAIL, ASSET_STATE_FAILED_TO_LOAD }
	the asset state. More...
enum	AssetType {   base =0, texture, mesh, multianimation,   spritevertex, font, sound, mdx,   parax, database, effectfile, dllplugin,   datagrid, cadMesh, image }
	each asset type has a unique asset type number
Public Types inherited from ParaEngine::IAttributeFields
typedef ParaEngine::weak_ptr< IObject, IAttributeFields >	WeakPtr_type
Public Types inherited from ParaEngine::IObject
typedef ParaEngine::weak_ptr< IObject >	WeakPtr_type
Static Public Member Functions inherited from ParaEngine::AssetEntity
static const string &	GetAssetServerUrl ()
	get the asset server url. More...
static void	SetAssetServerUrl (const char *pStr)
	set the asset server url. More...
Static Public Member Functions inherited from ParaEngine::IAttributeFields
static HRESULT	GetAttributeClassID_s (IAttributeFields *cls, int *p1)
static HRESULT	GetAttributeClassName_s (IAttributeFields *cls, const char **p1)
static bool	OpenWithDefaultEditor (const char *sFilename, bool bWaitOnReturn=false)
	Open a given file with the default registered editor in the game engine. More...
Protected Member Functions inherited from ParaEngine::IAttributeFields
virtual CAttributeClass *	CreateAttributeClass ()
	initialize fields
virtual CDynamicAttributesSet *	GetDynamicAttributes (bool bCreateIfNotExist=false)
Protected Attributes inherited from ParaEngine::IObject
WeakPtr_type	m_weak_reference
Protected Attributes inherited from ParaEngine::CRefCounted
int	m_refcount

Detailed Description

a voxel terrain entity uses a 3d grid to present a terrain mesh, such can have caves and overhangs on traditional height map terrains.

Internally, I used matching cube algorithm to build triangles from a 3d grid. Please note that a voxel terrain needs to be perfectly aligned with the height map terrain and use same base texture at intersection points. There are some tricks to make this work.

Remarks

: VoxelTerrainEntity does not use LOD, and it is basically an expensive highpoly mesh prebuilt from a 3d grid usually of size 32*32*32

Member Function Documentation

GetIsoSurface()

IsoSurfaceRenderable* ParaEngine::VoxelTerrainEntity::GetIsoSurface

(

)

Get the Iso surface object for rendering.

The isosurface is not created until this function is called the first time.

Init()

void ParaEngine::VoxelTerrainEntity::Init

(

const char *

filename

)

load the voxel entity from file.

the text file contains the grid data in the following format. – how many sells in the grid in x,y,z direction cellx = 32 celly = 32 cellz = 32 – index and value pairs. If an index is not defined, it is empty. – number of value pairs followed by index, value pairs on each line. ValueCount = 32 index,value; ... index,value;

Member Data Documentation

m_pDataGrid

DataGridPtr ParaEngine::VoxelTerrainEntity::m_pDataGrid

this is only created when a voxel entity is being manually edited by the user.

In other cases, like reading from file, the data grid is NULL; the global grid in VoxelTerrainManager is used to save memory.

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The documentation for this class was generated from the following files:

• Client/trunk/ParaEngineClient/VoxelMesh/VoxelTerrainEntity.h
• Client/trunk/ParaEngineClient/VoxelMesh/VoxelTerrainEntity.cpp