Defines resource parameters constraints of an SoDataSet object. More...
#include <LDM/nodes/SoLDMResourceParameters.h>
Classes | |
struct | FixedResolutionReport |
This structure returns information to the application when fixedResolution is TRUE and resolution is not -1. More... | |
Public Types | |
enum | LoadPolicy { NO_USER_INTERACTION , ALWAYS , NEVER } |
Tile Load Policy. More... | |
enum | TileCachePolicy { NONE , LOWRES_ONLY , ALL } |
Tile cache management policy (see the Memory Management section above for more information). More... | |
enum | ViewpointRefinementPolicy { VIEWPOINT_REFINEMENT_OFF , VIEWPOINT_REFINEMENT_ON , VIEWPOINT_REFINEMENT_INHERITED_FROM_GLOBAL } |
Viewpoint refinement policies. More... | |
enum | ScreenResolutionCullingPolicy { SCREEN_RESOLUTION_CULLING_OFF , SCREEN_RESOLUTION_CULLING_ON , SCREEN_RESOLUTION_CULLING_INHERITED_FROM_GLOBAL } |
Screen resolution culling policies. More... | |
typedef void | FixedResolutionCB(FixedResolutionReport &, void *) |
When fixedResolution is TRUE and resolution is not -1, this callback is used by the application to get a report back from LDM as far as progress achieved and requests made. | |
Public Member Functions | |
virtual SoType | getTypeId () const |
Returns the type identifier for this specific instance. | |
SoLDMResourceParameters () | |
Constructor. | |
virtual | ~SoLDMResourceParameters () |
Destructor. | |
void | setMovingTimeOut (float timeout) |
Sets the amount of time (in seconds) during which LDM continues not loading once a user stops interaction. | |
float | getMovingTimeOut () |
Returns the amount of time during which LDM continues not loading data once a user stops interaction. | |
int | getDataSize () |
Gets the size of a voxel in bytes. | |
void | enableFixedResolutionMode (int resolution, FixedResolutionCB *func) |
This method is used to specify a callback that gives feedback while the rendering tries to reach an explicit required fixed resolution. | |
void | setGeometryPriority (SoType geometryType, float priority) |
Sets the importance of one type of geometry relative to others. | |
SbBool | getGeometryPriority (SoType geometryType, float &priority) |
Returns the priority of the specified geometry type. | |
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 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. | |
Public Attributes | |
SoSFInt32 | maxMainMemory |
Maximum allowed main memory in MB that LDM is allowed to use for this data set. | |
SoSFInt32 | maxTexMemory |
Maximum allowed texture (GPU) memory in MB for this data set. | |
SoSFEnum | loadPolicy |
Tile loading policy. | |
SoSFEnum | tileCachePolicy |
Specify which tiles should be cached in LDM memory. | |
SoSFInt32 | tex3LoadRate |
Maximum number of 3D tiles to be loaded into texture memory per frame for this data set. | |
SoSFInt32 | max2DTexMemory |
Maximum of 2D textures memory in MB for this data set. | |
SoSFInt32 | tex2LoadRate |
Maximum number of 2D tiles to be loaded in texture memory per frame. | |
SoSFInt32 | minResolutionThreshold |
Minimum loading threshold for LDM module. | |
SoSFInt32 | maxResolutionThreshold |
Maximum loading threshold for the LDM module. | |
SoSFVec3i32 | tileDimension |
Sets the tile size. | |
SoSFVec3i32 | subTileDimension |
Size of subtiles used by some accelerated algorithms. | |
SoSFInt32 | loadNotificationRate |
Tile loading notification rate. | |
SoSFFloat | tileHalfLife |
Tile half-life (seconds). | |
SoSFBool | fixedResolution |
Specifies if a single resolution or several resolutions are used when the rendering is stabilized. | |
SoSFInt32 | resolution |
Specifies the resolution level when fixedResolution is TRUE. | |
SoSFInt32 | numPrefetchThread |
Number of threads used by the tile prefetch mechanism. | |
SoSFBool | tileBorders |
Defines whether or not to generate borders around tiles. | |
SoSFInt32 | minTilesToLoad |
Minimum number of tiles that must be loaded in memory before rendering. | |
SoSFEnum | viewpointRefinementPolicy |
Defines the viewpoint refinement policy. | |
SoSFEnum | screenResolutionCullingPolicy |
Defines the screen resolution culling policy. | |
Deprecated | |
class | SoLDMResourceManager |
Sets the tile overlap value (number of voxels) for non-LDM data. | |
Defines resource parameters constraints of an SoDataSet object.
This class contains fields and functions for setting resource parameters for one specific SoDataset.
Global LDM parameters can be set using static methods in class SoLDMGlobalResourceParameters. See the SoLDMGlobalResourceParameters class description for an overview of LDM memory management.
SoDataSet, SoVolumeData, SoLDMGlobalResourceParameters
Definition at line 73 of file SoLDMResourceParameters.h.
typedef void SoLDMResourceParameters::FixedResolutionCB(FixedResolutionReport &, void *) |
When fixedResolution is TRUE and resolution is not -1, this callback is used by the application to get a report back from LDM as far as progress achieved and requests made.
Definition at line 152 of file SoLDMResourceParameters.h.
Tile Load Policy.
Definition at line 157 of file SoLDMResourceParameters.h.
Screen resolution culling policies.
Used by screenResolutionCullingPolicy.
Enumerator | |
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SCREEN_RESOLUTION_CULLING_OFF | Screen resolution culling is disabled. |
SCREEN_RESOLUTION_CULLING_ON | Screen resolution culling is enabled. Only tiles for which the projection of a voxel is greater than or equal to 1 pixel on screen will be loaded. This avoids unnecessary loading of high resolution data for large volumes. However if you "zoom out" from a volume, it does not force lower resolution tiles to be used (high resolution tiles already in memory will still be used). If necessary use the fixedResolution field to force use of lower resolution tiles. |
SCREEN_RESOLUTION_CULLING_INHERITED_FROM_GLOBAL | Screen resolution culling will be enabled or not according to the flag returned by SoLDMGlobalResourceParameters::getScreenResolutionCulling() |
Definition at line 616 of file SoLDMResourceParameters.h.
Tile cache management policy (see the Memory Management section above for more information).
Used by tileCachePolicy.
For tiled data that is not compressed (e.g. a standard LDM format file), the TileCacheType setting has no effect and only the CPU tile cache is used.
Setting the SoPreferences variable LDM_USE_IN_MEM_COMPRESSION to false (zero) effectively sets the tile cache type to mode ALL.
Definition at line 178 of file SoLDMResourceParameters.h.
Viewpoint refinement policies.
Used by viewpointRefinementPolicy.
Enumerator | |
---|---|
VIEWPOINT_REFINEMENT_OFF | Viewpoint will not affect tile loading priorities. |
VIEWPOINT_REFINEMENT_ON | The refinement of tiles will depend on the viewpoint. In other words, the closest tiles to the camera have the highest priority and will be loaded first. This can be useful for large volumes that cannot be completely loaded in memory. |
VIEWPOINT_REFINEMENT_INHERITED_FROM_GLOBAL | The refinement of tiles will depend on the viewpoint or not according to the flag returned by SoLDMGlobalResourceParameters::getViewpointRefinement(). |
Definition at line 581 of file SoLDMResourceParameters.h.
SoLDMResourceParameters::SoLDMResourceParameters | ( | ) |
Constructor.
|
virtual |
Destructor.
void SoLDMResourceParameters::enableFixedResolutionMode | ( | int | resolution, |
FixedResolutionCB * | func | ||
) |
This method is used to specify a callback that gives feedback while the rendering tries to reach an explicit required fixed resolution.
This method sets the field fixedResolution to TRUE and the field resolution to the first argument.
Use this method only if a callback is specified and if an explicit resolution is required (0 or any positive value). Otherwise use the fields fixedResolution and resolution.
resolution | this value is assigned to the field resolution |
func | this callback is ignored if the resolution argument is -1. See resolution and fixedResolution for detail. |
|
static |
Returns the type identifier for this class.
int SoLDMResourceParameters::getDataSize | ( | ) |
Gets the size of a voxel in bytes.
Returns the priority of the specified geometry type.
The function will return FALSE if the geometry is of unknown type. See setGeometryPriority().
float SoLDMResourceParameters::getMovingTimeOut | ( | ) |
Returns the amount of time during which LDM continues not loading data once a user stops interaction.
Considered only in NO_USER_INTERACTION mode. See setMovingTimeOut().
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virtual |
Returns the type identifier for this specific instance.
Implements SoTypedObject.
void SoLDMResourceParameters::setGeometryPriority | ( | SoType | geometryType, |
float | priority | ||
) |
Sets the importance of one type of geometry relative to others.
The geometry type should be one of the VolumeViz geometry classes. For example, SoOrthoSlice::getClassTypeId().
The priority passed must be between 0 and 1, 0 being lowest priority and 1 the highest. LDM will refine tiles first where geometries are the most important. For example, if an SoVolumeRender node has a higher priority than slices, then the tiles required for this SoVolumeRender node will be refined first.
Default is 0.5 for a volume, 0.9 for other geometry.
void SoLDMResourceParameters::setMovingTimeOut | ( | float | timeout | ) |
Sets the amount of time (in seconds) during which LDM continues not loading once a user stops interaction.
In other words, LDM will start loading again timeOut seconds after the user stops interaction. Considered only in NO_USER_INTERACTION mode. Default is 0.3 seconds.
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friend |
Sets the tile overlap value (number of voxels) for non-LDM data.
0 is the only supported value since Open Inventor 9.0.
Definition at line 887 of file SoLDMResourceParameters.h.
SoSFBool SoLDMResourceParameters::fixedResolution |
Specifies if a single resolution or several resolutions are used when the rendering is stabilized.
When TRUE, this single resolution level is specified by the field resolution.
Default is FALSE, which specifies that the field resolution is ignored.
Definition at line 491 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::loadNotificationRate |
Tile loading notification rate.
Default is 50 tiles. When rate tiles have been loaded in main memory, a redraw will be scheduled. Which means, for the default rate, that if each voxel is one byte and the tile size is 64x64x64, a redraw will be scheduled whenever 13 MB of data has been loaded.
Default value is -1, meaning LDM is in charge of the automatic sharing of a given resource. Automatic sharing means LDM will compute, by itself, the amount of associated resource it allocates to each dataset. The automatic allocation takes into account all nodes in scenegraph.
If value is not -1 (default) LDM will not consider this node in automatic allocation, and allocated Notification rate for this node will be the exact value set in the field. In this case, the fixed value of notification rate is then removed from Global value. All other dataset will share (SoLDMGlobalResourceParameters::getLoadNotificationRate - ( Sum of memory of all datasets with * loadNotificationRate != -1 )) / ( number of datasets with loadNotificationRate == -1 )
Definition at line 470 of file SoLDMResourceParameters.h.
SoSFEnum SoLDMResourceParameters::loadPolicy |
Tile loading policy.
Use enum LoadPolicy. Default is NO_USER_INTERACTION. NO_USER_INTERACTION means the asynchronous loading threads will only load tiles when the user is not interacting with the scene (i.e. the application is idle).
The loading occurs as long as there is something to load if ALWAYS is passed. No loading occurs if NEVER is passed, however at least the resolution 0 is loaded.
Definition at line 286 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::max2DTexMemory |
Maximum of 2D textures memory in MB for this data set.
This field is only considered for SoSlice nodes.
Each tile needed to render a slice (SoOrthoSlice, SoVolumeSkin, etc) must be stored in GPU memory as a 2D texture. This method limits the amount of GPU memory that can be used by (for example) SoOrthoSlice and SoVolumeSkin nodes. This can be useful when combining slices and volume rendering because the 3D textures used by volume rendering require much more GPU memory.
Default value is -1, meaning LDM is in charge of the automatic sharing of a given resource. Automatic sharing means LDM will compute, by itself, the amount of associated resource it allocates to each dataset. The automatic allocation takes into account all nodes in scenegraph.
If value is not -1 (default) LDM will not consider this node in memory allocation, and allocated CPU memory for this node will be the exact value set in the field. In this case, the amount of memory is removed from Global value. All other dataset will share (SoLDMGlobalResourceParameters::setMax2DTexMemory - ( Sum of memory of all datasets with max2DTexMemory != -1 )) / ( number of datasets with max2DTexMemory == -1 )
NOTE: field available since Open Inventor 9.6.0
Definition at line 348 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::maxMainMemory |
Maximum allowed main memory in MB that LDM is allowed to use for this data set.
Default value is -1, meaning LDM is in charge of the automatic sharing of a given resource. Automatic sharing means LDM will compute, by itself, the amount of associated resource it allocates to each dataset. The automatic allocation take in account all nodes in scenegraph.
If value is not -1 (default) LDM will not consider this node in memory allocation, and allocated CPU memory for this node will be the exact value set in the field. In this case, the amount of memory is removed from Global value. All other dataset will share (SoLDMGlobalResourceParameters::getMaxMainMemory - ( Sum of memory of all datasets with maxMainMemory != -1 )) / ( number of datasets with maxMainMemory == -1 )
Definition at line 258 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::maxResolutionThreshold |
Maximum loading threshold for the LDM module.
LDM will never load tiles below this resolution threshold. Threshold is the power of 2 of the desired subsample level. For instance, passing 1 means never load tiles of full resolution. Default is 0, full resolution, i.e., load everything.
Definition at line 398 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::maxTexMemory |
Maximum allowed texture (GPU) memory in MB for this data set.
This field is only considered for SoVolumeRender nodes.
Default value is -1, meaning LDM is in charge of the automatic sharing of a given resource. Automatic sharing means LDM will compute, by itself, the amount of associated resource it allocates to each dataset. The automatic allocation take in account all nodes in scenegraph.
If value is not -1 (default) LDM will not consider this node in memory allocation, and allocated CPU memory for this node will be the exact value set in the field. In this case, the amount of memory is removed from Global value. All other dataset will share (SoLDMGlobalResourceParameters::getMaxTexMemory - ( Sum of memory of all datasets with maxTexMemory != -1 )) / ( number of datasets with maxTexMemory == -1 )
Definition at line 274 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::minResolutionThreshold |
Minimum loading threshold for LDM module.
Specifies to LDM to never unload tiles below this resolution threshold. Threshold is the power of 2 of the desired subsample level. For instance, passing 2 means never unload tiles of resolution 1/4. Default is -1, meaning the minimum subsample level.
If used with an ROI enabled, only tiles below the min resolution threshold and within the ROI subvolume will never be unloaded. All tiles outside the ROI subvolume will be unloaded. The ROI box allows you to specify where it is the most important to increase the resolution within the subvolume. By default, (subvolume ROI flag enabled) this would be within the box. If for example using the exclusion box mode, then lower resolution tiles will be within the box and higher resolution ones outside the box and within the subvolume.
Definition at line 389 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::minTilesToLoad |
Minimum number of tiles that must be loaded in memory before rendering.
For example, if this number is 50 and 40 tiles are currently loaded, then at least 10 new tiles must be loaded before the next rendering.
This can be used as a "minimum quality" parameter, where the quality is defined by the number of loaded tiles in memory. No rendering will be done until this minimum number of tiles is loaded in memory.
The tiles are selected according to their weight, which depends in particular on their hierarchy level in the octree topology.
If this number of tiles requires a memory amount that exceeds maxMainMemory, then it will be internally clamped to the maximum value that respects maxMainMemory.
The default value is 1 (root tile only).
NOTE: field available since Open Inventor 10.9.0
Definition at line 574 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::numPrefetchThread |
Number of threads used by the tile prefetch mechanism.
Tile prefetch is activated when LDM_USE_PREFETCH_OPTIM and LDM_USE_IN_MEM_COMPRESSION are set to true. Default value is -1, meaning the maximum number of threads will be used.
Definition at line 521 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::resolution |
Specifies the resolution level when fixedResolution is TRUE.
Default is 1, i.e, 1 voxel out of 2 of the full resolution.
Definition at line 514 of file SoLDMResourceParameters.h.
SoSFEnum SoLDMResourceParameters::screenResolutionCullingPolicy |
Defines the screen resolution culling policy.
Use enum ScreenResolutionCullingPolicy. The default value is SCREEN_RESOLUTION_CULLING_INHERITED_FROM_GLOBAL.
NOTE: field available since Open Inventor 10.10.0
Definition at line 647 of file SoLDMResourceParameters.h.
SoSFVec3i32 SoLDMResourceParameters::subTileDimension |
Size of subtiles used by some accelerated algorithms.
Default is (32, 32, 32). This field is only considered when field SoVolumeRender::subdivideTile is set to TRUE. Notes:
Definition at line 451 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::tex2LoadRate |
Maximum number of 2D tiles to be loaded in texture memory per frame.
This affects rendering nodes that use 2D textures, for example SoOrthoSlice and SoVolumeSkin. Default is SoLDMGlobalResourceParameters::getTex2LoadRate(). This field is only considered for SoSlice nodes.
Each tile needed to render a slice (SoOrthoSlice, SoVolumeSkin, etc) must be loaded into GPU memory as a 2D texture. Increasing the loadRate value reduces the number of frames required to reach maximum resolution. But the render traversal has to wait for the data transfer to finish, so each frame may take longer to render, increasing the total time to reach maximum resolution.
Default value is -1, meaning LDM is in charge of the automatic sharing of a given resource. Automatic sharing means LDM will compute, by itself, the amount of associated resource it allocates to each dataset. The automatic allocation takes into account all nodes in scenegraph.
If value is not -1 (default) LDM will not consider this node in automatic allocation, and allocated 2D texture for this node will be the exact value set in the field. In this case, the amount of LoadRate is removed from Global value. All other dataset will share (SoLDMGlobalResourceParameters::getTex2LoadRate - ( Sum of memory of all datasets with tex2LoadRate != -1 )) / ( number of datasets with tex2LoadRate == -1 )
Definition at line 372 of file SoLDMResourceParameters.h.
SoSFInt32 SoLDMResourceParameters::tex3LoadRate |
Maximum number of 3D tiles to be loaded into texture memory per frame for this data set.
You can set this number for all data sets by calling SoLDMGlobalResourceParameters::setTex3LoadRate(). This field is only considered for SoVolumeRender nodes.
Each tile needed for volume rendering (SoVolumeRender) and volume geometry must be transfered to GPU memory as a 3D texture. So, for example, transfering 1000 tiles at the loadRate 10 requires 100 frames. (How many seconds this takes depends on the frames per second possible, which in turn depends on many factors including the complexity of the scene graph.) Increasing the loadRate value reduces the number of frames required to reach maximum resolution. But the render traversal has to wait for the data transfer to finish, so each frame may take longer to render, increasing the total time to reach maximum resolution.
Default value is -1, meaning LDM is in charge of the automatic sharing of a given resource. Automatic sharing means LDM will compute, by itself, the amount of associated resource it allocates to each dataset. The automatic allocation takes into account all nodes in scenegraph.
If value is not -1 (default) LDM will not consider this node in automatic allocation, and allocated 3D texture LoadRate for this node will be the exact value set in the field. In this case, the amount of memory is removed from Global value. All other dataset will share (SoLDMGlobalResourceParameters::getTex3LoadRate - ( Sum of memory of all datasets with tex3LoadRate != -1 )) / ( number of datasets with tex3LoadRate == -1 )
Definition at line 324 of file SoLDMResourceParameters.h.
SoSFBool SoLDMResourceParameters::tileBorders |
Defines whether or not to generate borders around tiles.
Borders are used to accelerate the interpolation of voxel values at the boundary of adjacent tiles.
Limitations:
The default value is TRUE.
NOTE: field available since Open Inventor 10.9.0
Definition at line 551 of file SoLDMResourceParameters.h.
SoSFEnum SoLDMResourceParameters::tileCachePolicy |
Specify which tiles should be cached in LDM memory.
Please refer to TileCachePolicy for the different options. Default value is ALL.
Note that in the case of an in-memory volume, the default mode will duplicate data in memory. In this case, you should use LOWRES_ONLY or NONE.
NOTE: field available since Open Inventor 10.0
Definition at line 298 of file SoLDMResourceParameters.h.
SoSFVec3i32 SoLDMResourceParameters::tileDimension |
Sets the tile size.
VolumeViz always manages volume data in CPU memory as a hierarchy of tiles and data is transferred to GPU memory as tiles.
When using VolumeViz with in-memory data or a file format other than LDM, the data is converted to tiles "on the fly". In this case, the default tile size is (128, 128, 128).
When loading data using an LDM volume reader, e.g. loading an LDM format file or using a custom volume reader that implements the readTile() method, the tile size is initialized with the value returned by the reader's getTileSize() method. The application can specify a different tile size, in which case the tiles are automatically generated using the data from the reader's tiles, with the following limitation: If the reader's readTile() method returns uniform or compressed buffers (SoCpuBufferUniform or SoCpuBufferCompressed), they are converted to regular buffers and the memory optimization is lost.
Changing the default tile size may affects the rendering or data loading performances. Basically, a larger tile size is usually better for rendering performance or to quickly obtain the highest resolution thanks to more optimal GPU utilization. On the other hand, it may penalize the data fetching on the CPU side from slow hard disk drives or over the network. Experimentation is generally required to find a good trade-off between rendering efficiency and data fetching time.
Notes:
Definition at line 438 of file SoLDMResourceParameters.h.
SoSFFloat SoLDMResourceParameters::tileHalfLife |
Tile half-life (seconds).
Default is 2 seconds. When calling SoDataSet::getLdmDataAccess::getData(), once a tile is unlocked by the application (call to SoDataSet::getLdmDataAccess::releaseData), its weight will decrease until the tile is weighted again by LDM. This function allows you to set how long it takes for the tile's weight to be divided by 2 (initial weight is 1). The tile weight will be set to 0 when the weight becomes less than 0.05.
Definition at line 481 of file SoLDMResourceParameters.h.
SoSFEnum SoLDMResourceParameters::viewpointRefinementPolicy |
Defines the viewpoint refinement policy.
Use enum ViewpointRefinementPolicy. The default value is VIEWPOINT_REFINEMENT_INHERITED_FROM_GLOBAL.
NOTE: field available since Open Inventor 10.9.0
Definition at line 609 of file SoLDMResourceParameters.h.