Base class for LDM data set readers More...
#include <LDM/readers/SoLDMReader.h>
Public Types | |
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... | |
Public Member Functions | |
virtual SoType | getTypeId () const |
Returns the type identifier for this specific instance. | |
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 ¢er) |
Returns the center of the data associated with the specified file ID. | |
virtual ReadError | getDataChar (SbBox3f &size, SoDataSet::DataType &type, SbVec3i32 &dim) override |
Gets the characteristics (file header) of the data volume. | |
void | getSubSlice (const SbBox2i32 &subSlice, int sliceNumber, void *data) |
Note: SoLDMReader does not implement this method. | |
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 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 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 int | handleHeader (TiXmlElement *) |
Handle tags of LDM reader inheriting from this base class. | |
virtual SbBool | isThreadSafe () const |
Return true as this reader is thread safe. | |
virtual SbVec2d | getTileMinMax (int index) const |
Returns the minimum and maximum data values for the given tile. | |
virtual ReadError | getDataChar (SbBox3f &size, SoDataSet::DataType &type, SbVec3i32 &dim)=0 |
Gets the characteristics (file header) of the data volume. | |
virtual void | getSubSlice (const SbBox2i32 &subSlice, int sliceNumber, void *data) |
Must copy the rectangular part defined by subSlice of the XY slice sliceNumber to the memory referenced by data. | |
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. | |
Public Member Functions inherited from SoVolumeReader | |
SoVolumeReader () | |
Constructor. | |
virtual SbBool | setOutputDataType (SbBool doChange, SoDataSet::DataType outputType) |
Sets the output data type. | |
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. | |
virtual int | getNumSignificantBits () |
This method is optional. | |
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 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. | |
Deprecated | |
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). | |
virtual SoDEPRECATED SbBool | getMinMax (int &min, int &max) |
Returns the minimum and maximum data values. | |
Additional Inherited Members | |
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 |
Base class for LDM data set readers
This is the base class for specific LDM readers.
See SoVRLdmFileReader for a specific implementation.
This class retrieves the XML tags from an LDM header file (usually a .ldm file) that are general to all LDM files, i.e. the tags that are interpreted by VolumeViz.
Custom tags for classes derived from SoLDMReader can be retrieved by overriding the handleHeader method.
General tags common for all LDM Readers are:
Note that the minimum tags that MUST be in the LDM header are <Size> or <Dimension> and <TileSize>. Otherwise the reader will throw a "tag missing" exception.
Definition at line 97 of file SoLDMReader.h.
LDM Reader error code.
Definition at line 109 of file SoLDMReader.h.
SoLDMReader::SoLDMReader | ( | ) |
Constructor.
Returns the bounding box of the data associated with the specified file ID.
The file ID corresponds to the tile ID in an LDM data file. If returns FALSE, not supported.
Definition at line 675 of file SoLDMReader.h.
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Returns the border flag.
If 0, tiles do not overlap. If not 0, they do.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileBorderReader.
Returns the center of the data associated with the specified file ID.
If returns FALSE, not supported.
Definition at line 681 of file SoLDMReader.h.
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Returns the type identifier for this class.
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Returns a volume writer that corresponds to this reader
(same format, parameters, etc).
If no writer can be created, NULL is returned.
Notes:
For example:
Reimplemented from SoVolumeReader.
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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.
Implements SoVolumeReader.
Reimplemented in SoVRLdmFileBorderReader, and SoVRLdmFileReader.
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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.
Implements SoVolumeReader.
Reimplemented in SoVRLdmFileBorderReader, and SoVRLdmFileReader.
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Returns the dimension of the data.
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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 SoVolumeReader.
Reimplemented in SoVRLdmFileReader.
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Returns the minimum and maximum data values (for float values).
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileReader.
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Returns the minimum and maximum data values.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileReader.
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Returns the minimum and maximum data values.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileReader.
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Returns original file name from which the data has been converted to LDM format if stored in file.
Reimplemented from SoVolumeReader.
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Returns the reader type.
Reimplemented from SoVolumeReader.
Definition at line 290 of file SoLDMReader.h.
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Returns the bounding box of the total data in world coordinates.
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Same as getSubSlice( const SbBox2i32& subSlice, int sliceNumber, void * data ) but using an SoBufferObject as the target of the data.
If not reimplemented then the version with "unsigned char*" parameter is called
subSlice | 2D region of the slice to return. |
sliceNumber | Slice number on the volume Z axis (first slice is 0). |
dataBuffer | The target buffer to be filled. |
Reimplemented from SoVolumeReader.
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Must copy the rectangular part defined by subSlice of the XY slice sliceNumber to the memory referenced by data.
Slices will not always be read sequentially.
subSlice | 2D region of the slice to return. |
sliceNumber | Slice number on the volume Z axis (first slice is 0). |
data | Copy the data into this buffer. |
You can use the convenience method getBuffer() to read data from file. Note: setFilename() must have been called previously.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileReader.
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Note: SoLDMReader does not implement this method.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileReader.
Definition at line 687 of file SoLDMReader.h.
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Returns the minimum and maximum data values for the given tile.
This information benefits optimizations such as SoLDMGlobalResourceParameters::setIgnoreFullyTransparentTiles and custom SoVolumeReader able to return SoCpuBufferUniform.
VolumeViz will only call this method if the data is organized in tiles like the LDM file format. In other words, if isDataConverted() returned true. The LDM Converter program automatically computes this information and stores it in the LDM header file. Custom volume readers that implement tiled data, i.e. return true when isDataConverted is called, should consider implement this method when the min max values are available from their backend API.
NOTES:
Default implementation returns SbVec2d(numeric_limits<double>::max(),-numeric_limits<double>::max())
index | The fileId of the tile. |
Reimplemented from SoVolumeReader.
Returns the size of a data tile.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileBorderReader.
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Returns the type identifier for this specific instance.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileBorderReader, and SoVRLdmFileReader.
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Gets the first occurrence of the XML element whose tag name is specified by tagName.
Then the associated value or subtags can be fetched using the SbXmlElement methods. Custom XML tags can be added to the LDM header file by using the method SoLDMConverter::setXmlCallback().
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Handle tags of LDM reader inheriting from this base class.
Definition at line 298 of file SoLDMReader.h.
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Returns whether the bytes of the data are stored in big or little endian order.
The order is little endian if the function returns true.
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Return true as this reader is thread safe.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileBorderReader, and SoVRLdmFileReader.
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Given an index, reads a tile if the data is organized in tiles (for LDM).
In the default LDM architecture, the LDM data is based on an octree topology (see SoLDMFileReader). The index passed is 0 for the tile of lowest resolution representing the entire volume (octree root node). The index increments linearly going down through the octree.
A tile can be undefined or empty which means it is not rendered and it isn't taken into account for the rendering of its adjacent cells. An empty buffer or NULL can be returned by this method to specify an undefined tile.
index | specifies a fileID, the id of an existing tile (fileID=tileID in a cubical volume). |
tilePosition | specifies the position of the data in the associated volume data of the tile corresponding to the given index. In the default SoVRLdmFileReader, the tilePosition isn't actually used but it is passed as a convenience for customized readers (can be used for mapping to a different index scheme). |
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileBorderReader.
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Given an index, reads a tile if the data is organized in tiles (for LDM).
In the default LDM architecture, the LDM data is based on an octree topology (see SoLDMFileReader). The index passed is 0 for the tile of lowest resolution representing the entire volume (octree root node). The index increments linearly going down through the octree.
index | specifies a fileID, the id of an existing tile (fileID=tileID in a cubical volume). |
tilePosition | specifies the position of the data in the associated volume data of the tile corresponding to the given index. In the default SoVRLdmFileReader, the tilePosition isn't actually used but it is passed as a convenience for customized readers (can be used for mapping to a different index scheme). |
Returns a pointer to an allocated buffer containing the data.
Reimplemented from SoVolumeReader.
Reimplemented in SoVRLdmFileBorderReader.
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Same as readTile(int index, unsigned char*& buffer, const SbBox3i32& tilePosition) but using an SoBufferObject (allocated by LDM) as the target of the data.
If not reimplemented then the version with "unsigned char*" parameter is called
Reimplemented from SoVolumeReader.
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Given an index, reads a tile if the data is organized in tiles (for LDM).
In the default LDM architecture, the LDM data is based on an octree topology (see SoVRLdmFileReader). The index passed is 0 for the tile of lowest resolution representing the entire volume (octree root node). The index increments linearly going down through the octree.
Indexing works as follows:
Tile 1 is the lower back left corner of the cube. The index increments on X, then Y, and finally Z. So the back tiles are:
3 4
1 2
And the front tiles are:
7 8
5 6
The tiles of full resolution are the leaf tiles.
In the default SoVRLdmFileReader, the tilePosition isn't actually used by the reader but it is passed as a convenience for customized readers (can be used for mapping to a different index scheme).
Reimplemented from SoVolumeReader.
Definition at line 871 of file SoVolumeReader.h.
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Given an index, reads a tile if the data is organized in tiles (for LDM).
In the default LDM architecture, the LDM data is based on an octree topology (see SoLDMFileReader). The index passed is 0 for the tile of lowest resolution representing the entire volume (octree root node). The index increments linearly going down through the octree.
Indexing works as follows:
Tile 1 is the lower back left corner of the cube. The index increments on X, then Y, and finally Z. So the back tiles are:
3 4
1 2
And the front tiles are:
7 8
5 6
The tiles of full resolution are the leaf tiles.
index | specifies a fileID, the id of an existing tile (fileID=tileID in a cubical volume). |
buffer | The buffer in which the data is returned. |
tilePosition | specifies the position of the data in the associated volume data of the tile corresponding to the given index. In the default SoVRLdmFileReader, the tilePosition isn't actually used but it is passed as a convenience for customized reader (can be used for mapping to a different index scheme). |
Reimplemented from SoVolumeReader.
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Read directly from the LDM data source, an orthoslice on the X axis inside a tile.
index | The fileId of the tile. |
buffer | The buffer in which the data is returned. |
tilePosition | Specifies the position of the data in the associated volume data of the tile corresponding to the given index. In the default SoVRLdmFileReader, the tilePosition isn't actually used but it is passed as a convenience for customized reader (can be used for mapping to a different index scheme). |
slicePosition | The slice position in the tile. |
Reimplemented from SoVolumeReader.
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Read directly from the LDM data source, a trace inside a tile.
index | The fileId of the tile. |
buffer | The buffer in which the data is returned. |
tilePosition | Specifies the position of the data in the associated volume data of the tile corresponding to the given index. In the default SoVRLdmFileReader, the tilePosition isn't actually used but it is passed as a convenience for customized reader (can be used for mapping to a different index scheme). |
tracePosition | represents the (i,j) coordinates of the trace. |
Reimplemented from SoVolumeReader.
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Read directly from the LDM data source, an orthoslice on the Y axis inside a tile.
index | The fileId of the tile. |
buffer | The buffer in which the data is returned. |
tilePosition | Specifies the position of the data in the associated volume data of the tile corresponding to the given index. In the default SoVRLdmFileReader, the tilePosition isn't actually used but it is passed as a convenience for customized reader (can be used for mapping to a different index scheme). |
slicePosition | The slice position in the tile. |
Reimplemented from SoVolumeReader.
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Read directly from the LDM data source, an orthoslice on the Z axis inside a tile.
index | The fileId of the tile. |
buffer | The buffer in which the data is returned. |
tilePosition | Specifies the position of the data in the associated volume data of the tile corresponding to the given index. In the default SoVRLdmFileReader, the tilePosition isn't actually used but it is passed as a convenience for customized reader (can be used for mapping to a different index scheme). |
slicePosition | The slice position in the tile. |
Reimplemented from SoVolumeReader.