SoVRLdmFileReader Class Reference

LDM file reader. More...

#include <LDM/readers/SoVRLdmFileReader.h>

Inheritance diagram for SoVRLdmFileReader:

Public Member Functions
virtual SoType	getTypeId () const
	Returns the type identifier for this specific instance.
	SoVRLdmFileReader ()
	Default constructor.
virtual ReadError	getDataChar (SbBox3f &size, SoDataSet::DataType &type, SbVec3i32 &dim) override
	Gets the characteristics (file header) of the data volume.
virtual SbBool	getMinMax (int64_t &min, int64_t &max)
	Returns the minimum and maximum data values.
virtual SbBool	getMinMax (double &min, double &max)
	Returns the minimum and maximum data values (for float values).
virtual SbBool	getHistogram (std::vector< int64_t > &numVox)
	Returns the distribution of data values, i.e., the number of voxels per data value.
virtual int	getNumSignificantBits ()
	Returns the number of significant bits.
virtual SbBool	isThreadSafe () const
	Return true as this reader is thread safe.
Deprecated
SoDEPRECATED void	getSubSlice (const SbBox2i32 &subSlice, int sliceNumber, void *data)
virtual SoDEPRECATED SbBool	getMinMax (int &min, int &max)
	Returns the minimum and maximum data values.
Public Member Functions inherited from SoLDMReader
	SoLDMReader ()
	Constructor.
virtual SbBox3f	getSize ()
	Returns the bounding box of the total data in world coordinates.
virtual SbVec3i32	getDimension ()
	Returns the dimension of the data.
virtual SbBool	getTileSize (SbVec3i32 &tile)
	Returns the size of a data tile.
virtual SbBool	getBbox (int fileId, SbBox3f &box)
	Returns the bounding box of the data associated with the specified file ID.
virtual SbBool	getCenter (int fileId, SbVec3f &center)
	Returns the center of the data associated with the specified file ID.
virtual SoBufferObject *	readTile (int index, const SbBox3i32 &tilePosition)
	Given an index, reads a tile if the data is organized in tiles (for LDM).
virtual SbBool	readXTraceInTile (int index, unsigned char *&buffer, const SbBox3i32 &tilePosition, const SbVec2i32 &tracePosition)
	Read directly from the LDM data source, a trace inside a tile.
virtual SbBool	readXSliceInTile (int index, unsigned char *&buffer, const SbBox3i32 &tilePosition, const uint32_t &slicePosition)
	Read directly from the LDM data source, an orthoslice on the X axis inside a tile.
virtual SbBool	readYSliceInTile (int index, unsigned char *&buffer, const SbBox3i32 &tilePosition, const uint32_t &slicePosition)
	Read directly from the LDM data source, an orthoslice on the Y axis inside a tile.
virtual SbBool	readZSliceInTile (int index, unsigned char *&buffer, const SbBox3i32 &tilePosition, const uint32_t &slicePosition)
	Read directly from the LDM data source, an orthoslice on the Z axis inside a tile.
virtual bool	isLittleEndian ()
	Returns whether the bytes of the data are stored in big or little endian order.
virtual SbString	getOriginalFilename () const
	Returns original file name from which the data has been converted to LDM format if stored in file.
virtual SbXmlTag	getXmlTag (const char *tagName)
	Gets the first occurrence of the XML element whose tag name is specified by tagName.
virtual SoVolumeReader::ReaderType	getReaderType ()
	Returns the reader type.
virtual SoVolumeWriter *	getConfiguredWriter ()
	Returns a volume writer that corresponds to this reader (same format, parameters, etc).
virtual SbVec2d	getTileMinMax (int index) const
	Returns the minimum and maximum data values for the given tile.
virtual void	getSubSlice (const SbBox2i32 &subSlice, int sliceNumber, SoBufferObject *dataBuffer)
	Same as getSubSlice( const SbBox2i32& subSlice, int sliceNumber, void * data ) but using an SoBufferObject as the target of the data.
virtual SoBufferObject *	readTile (int index, const SbBox3i32 &tilePosition)
	Given an index, reads a tile if the data is organized in tiles (for LDM).
virtual SoDEPRECATED SbBool	readTile (int index, unsigned char *&buffer, const SbBox3i32 &tilePosition)
	Given an index, reads a tile if the data is organized in tiles (for LDM).
virtual SoDEPRECATED SbBool	readTile (int index, SoBufferObject *buffer, const SbBox3i32 &tilePosition)
	Same as readTile(int index, unsigned char*& buffer, const SbBox3i32& tilePosition) but using an SoBufferObject (allocated by LDM) as the target of the data.
virtual SoDEPRECATED int	getBorderFlag ()
	Returns the border flag.
virtual SoDEPRECATED SbBool	readTile (int index, unsigned char *&buffer, const SbBox3i32 &tilePosition)
	Given an index, reads a tile if the data is organized in tiles (for LDM).
Public Member Functions inherited from SoVolumeReader
	SoVolumeReader ()
	Constructor.
virtual SbBool	setInputDataRange (SbBool doChange, double min, double max)
	Requests that the input be converted from the specified range to the range depending on the output data type.
SbVec3i32	getNumVoxels (const SbVec3i32 &realSize, const SbVec3i32 &subsamplingLevel)
	Utility function provided by SoVolumeReader for subclass readers to call.
SbVec3i32	getSizeToAllocate (const SbVec3i32 &realSize, const SbVec3i32 &subsamplingLevel)
	Utility function provided by SoVolumeReader for subclass readers to call.
virtual int	setFilename (const SbString &filename)
	Specifies the path of the file.
SbString	getFilename () const
	Returns the path of the file.
virtual SbBool	isIgnoredFile () const
	Should return TRUE if at least one file has been ignored during reading.
virtual SbBool	setDirectCoordSysAutoDetection (SbBool autoValue)
	Sets whether or not the reader should automatically try to detect if the coordinate system used is direct or not.
virtual SbBool	getDirectCoordSysAutoDetection ()
	Return automatic detection value.
virtual SbBool	setDirectCoorSys (SbBool directCoord)
	Specify if the coordinate system used is direct or not.
virtual SbBool	getDirectCoordSys ()
	Return whether the coordinate system used is direct or not.
CoordinateType	getCoordinateType ()
	Returns coordinate type used by the data set.
const float *	getRectilinearCoordinates (Axis axis) const
	Returns the coordinates for the specified axis.
void	setRectilinearCoordinates (const float *x, const float *y, const float *z)
	Sets rectilinear coordinates for the data set.
virtual SbBool	isRGBA () const
	Returns TRUE if the data set contains RGBA color values.
void	setRGBA (const SbBool flag)
	Specifies if data must be considered as RGBA.
Public Member Functions inherited from SoFieldContainer
void	setToDefaults ()
	Sets all fields in this object to their default values.
SbBool	hasDefaultValues () const
	Returns TRUE if all of the object's fields have their default values.
SbBool	fieldsAreEqual (const SoFieldContainer *fc) const
	Returns TRUE if this object's fields are exactly equal to fc's fields.
void	copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
	Copies the contents of fc's fields into this object's fields.
SoNONUNICODE SbBool	set (const char *fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.
SbBool	set (const SbString &fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.
void	get (SbString &fieldDataString)
	Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.
virtual int	getFields (SoFieldList &list) const
	Appends references to all of this object's fields to resultList, and returns the number of fields appended.
virtual int	getAllFields (SoFieldList &list) const
	Returns a list of fields, including the eventIn's and eventOut's.
virtual SoField *	getField (const SbName &fieldName) const
	Returns a the field of this object whose name is fieldName.
virtual SoField *	getEventIn (const SbName &fieldName) const
	Returns a the eventIn with the given name.
virtual SoField *	getEventOut (const SbName &fieldName) const
	Returns the eventOut with the given name.
SbBool	getFieldName (const SoField *field, SbName &fieldName) const
	Returns the name of the given field in the fieldName argument.
SbBool	enableNotify (SbBool flag)
	Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).
SbBool	isNotifyEnabled () const
	Notification is the process of telling interested objects that this object has changed.
virtual void	setUserData (void *data)
	Sets application data.
void *	getUserData (void) const
	Gets user application data.
Public Member Functions inherited from SoBase
virtual void	touch ()
	Marks an instance as modified, simulating a change to it.
virtual SbName	getName () const
	Returns the name of an instance.
virtual void	setName (const SbName &name)
	Sets the name of an instance.
void	setSynchronizable (const bool b)
	Sets this to be a ScaleViz synchronizable object.
bool	isSynchronizable () const
	Gets the ScaleViz synchronizable state of this object.
Public Member Functions inherited from SoRefCounter
void	ref () const
	Adds a reference to an instance.
void	unref () const
	Removes a reference from an instance.
void	unrefNoDelete () const
	unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.
int	getRefCount () const
	Returns current reference count.
void	lock () const
	lock this instance.
void	unlock () const
	unlock this instance.
Public Member Functions inherited from SoTypedObject
SbBool	isOfType (const SoType &type) const
	Returns TRUE if this object is of the type specified in type or is derived from that type.
template<typename TypedObjectClass >
SbBool	isOfType () const
	Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.

Static Public Member Functions
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
Static Public Member Functions inherited from SoLDMReader
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
Static Public Member Functions inherited from SoVolumeReader
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
static SoVolumeReader *	getAppropriateReader (const SbString &filename)
	Returns a preconfigured SoVolumeReader instance that can be used to load the given file (based on the filename extension).
Static Public Member Functions inherited from SoFieldContainer
static SoType	getClassTypeId ()
	Returns the type of this class.
Static Public Member Functions inherited from SoBase
static SoType	getClassTypeId ()
	Returns type identifier for this class.
Static Public Member Functions inherited from SoTypedObject
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Additional Inherited Members
Public Types inherited from SoLDMReader
enum	SoLDMError {   LDM_NO_ERROR ,   LDM_FILE_NOT_FOUND ,   LDM_XML_ROOT_START_TAG_NOT_FOUND ,   LDM_XML_ROOT_END_TAG_NOT_FOUND ,   LDM_ALTERNATE_FILE_NOT_FOUND ,   LDM_XML_PARSING_ERROR ,   LDM_SIZE_TAG_MISSING ,   LDM_COMPLETION_FILE_NOT_FOUND ,   LDM_RD_NO_ERROR ,   LDM_RD_FILE_NOT_FOUND_ERROR ,   LDM_RD_UNSUPPORTED_DATA_TYPE_ERROR ,   LDM_RD_UNKNOWN_ERROR }
	LDM Reader error code. More...
Public Types inherited from SoVolumeReader
enum	ReadError {   RD_NO_ERROR ,   RD_FILE_NOT_FOUND_ERROR ,   RD_INVALID_DATA_ERROR ,   RD_UNSUPPORTED_DATA_TYPE_ERROR ,   RD_FILE_FORMAT_NOT_VALID_ERROR ,   RD_UNKNOWN_ERROR }
	Read error. More...
enum	Axis {   X ,   Y ,   Z }
	Which axis to handle. More...
enum	ReaderType {   NO_READER ,   AM ,   AVS ,   DICOM ,   GENERIC ,   LDM ,   MEMORY ,   RASTERSTACK ,   SEGY ,   VOL ,   VOX ,   TIFF ,   MRC }
	Available reader type. More...
enum	CoordinateType {   COORDINATES_UNIFORM = 0 ,   COORDINATES_RECTILINEAR }
	Coordinate type used by this data set. More...
Protected Member Functions inherited from SoVolumeReader
virtual	~SoVolumeReader ()
	Destructor.
void *	getBuffer (int64_t offset, unsigned int size)
	Returns a pointer to a buffer of size bytes corresponding to a part of the file at offset bytes from the beginning of the file.
int64_t	fileSize ()
	Returns the size of the file when file I/O is handled by this class.
Static Protected Member Functions inherited from SoVolumeReader
static bool	registerVolumeReaderExtension (const SbString &fileExtension, const SoType &readerType)
	Register an SoVolumeReader class to handle a file extension.
static bool	unregisterVolumeReaderExtensions (const SoType &readerType)
	Unregister all filename extensions associated with the specified SoVolumeReader class.
static int	bytesToInt (const unsigned char *ptr, int sizeBytes)
	Utility method that returns an integer from sizeBytes bytes starting at address ptr.
static void	swapBytes (int *intPtr, int sizeBytes)
	Utility method to convert an integer into the correct architecture (little/big endian).
static void	swapBytesN (void *buffer, int numElements, int numBytesPerElement)
	Utility method to swap bytes of each element of an array of numElements elements.
static SbBool	isValidFloat (const float val)
	Utility method to check if value is a valid IEEE 754 floating point number.
static SbBox3f	adjustFlatExtent (const SbString &fileName, const SbBox3f &extent, const SbVec3i32 &dim)
	VolumeViz doesn't handles empty extent (for ex.
Protected Attributes inherited from SoVolumeReader
SoDEPRECATED SbBool	m_dataConverted

Detailed Description

LDM file reader.

LDM is a format for storing hierarchical multi-resolution volume data, defined by VSG. VolumeViz includes a utility program that can convert other formats (supported by VolumeViz) into this format. Preprocessing volume data into this format provides the maximum benefits from the VolumeViz large data management (LDM) features.

The default VolumeViz LDM file format is based on an octree topology. The data is stored in tiles of different subsampling resolution.

The first tile in the file represents the entire volume at its lowest resolution and corresponds to the root of the octree. The next 8 tiles represent octants of the entire volume at a lower subsample step. There is another set of 8 tiles for each of these tiles, and so on, until reaching tiles of full resolution.

The tile index starts at 0 for the root and increments linearly into the octree (1 to 8 for octree children, 9 to 16 for children of tile 1, and so on).

The data of a tile is accessed with the readTile function by passing an index and allocated buffer.

Definition at line 69 of file SoVRLdmFileReader.h.

Constructor & Destructor Documentation

SoVRLdmFileReader()

SoVRLdmFileReader::SoVRLdmFileReader

(

)

Default constructor.

Member Function Documentation

getClassTypeId()

static SoType SoVRLdmFileReader::getClassTypeId ( )

static

Returns the type identifier for this class.

getDataChar()

virtual ReadError SoVRLdmFileReader::getDataChar ( SbBox3f &  size, SoDataSet::DataType &  type, SbVec3i32 &  dim  )

overridevirtual

Gets the characteristics (file header) of the data volume.

See SoDataSet::setVolumeData().
You can use the convenience method setFilename() to specify the file location, in which case you will not have to open the file yourself. Then you can use the convenience method getBuffer() to read the header in order to get the requested information.

NOTE: We strongly recommend that readers implement this version of getDataChar, introduced in VolumeViz 5.1, because it uses SbVec3i32 for the volume dimension.

Reimplemented from SoLDMReader.

Reimplemented in SoVRLdmFileBorderReader.

getHistogram()

virtual SbBool SoVRLdmFileReader::getHistogram ( std::vector< int64_t > &  numVox )

virtual

Returns the distribution of data values, i.e., the number of voxels per data value.

numVox(0) is the number of voxels with value 0, numVox(1) is the number of voxels with value 1, and so on.

Reimplemented from SoLDMReader.

getMinMax() [1/3]

virtual SbBool SoVRLdmFileReader::getMinMax ( double &  min, double &  max  )

virtual

Returns the minimum and maximum data values (for float values).

Reimplemented from SoLDMReader.

getMinMax() [2/3]

virtual SoDEPRECATED SbBool SoVRLdmFileReader::getMinMax ( int &  min, int &  max  )

virtual

Returns the minimum and maximum data values.

Reimplemented from SoLDMReader.

getMinMax() [3/3]

virtual SbBool SoVRLdmFileReader::getMinMax ( int64_t &  min, int64_t &  max  )

virtual

Returns the minimum and maximum data values.

Reimplemented from SoLDMReader.

getNumSignificantBits()

virtual int SoVRLdmFileReader::getNumSignificantBits ( )

inlinevirtual

Returns the number of significant bits.

Reimplemented from SoVolumeReader.

Definition at line 107 of file SoVRLdmFileReader.h.

getSubSlice()

SoDEPRECATED void SoVRLdmFileReader::getSubSlice ( const SbBox2i32 &  subSlice, int  sliceNumber, void *  data  )

virtual

Reimplemented from SoLDMReader.

getTypeId()

virtual SoType SoVRLdmFileReader::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoLDMReader.

Reimplemented in SoVRLdmFileBorderReader.

isThreadSafe()

virtual SbBool SoVRLdmFileReader::isThreadSafe ( ) const

virtual

Return true as this reader is thread safe.

Reimplemented from SoLDMReader.

Reimplemented in SoVRLdmFileBorderReader.

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

• LDM/readers/SoVRLdmFileReader.h