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SoVolumeRender Class Reference

Render the full volume. More...

#include <VolumeViz/nodes/SoVolumeRender.h>

Inheritance diagram for SoVolumeRender:
SoShape SoNode SoFieldContainer SoBase

Public Types

enum  Interpolation { NEAREST, LINEAR }
 
enum  Composition { MAX_INTENSITY, SUM_INTENSITY, ALPHA_BLENDING }
 
enum  NumSlicesControl { ALL, MANUAL, AUTOMATIC }
 
enum  AbortCode { CONTINUE, ABORT, SKIP }
 
typedef AbortCode SoVolumeRenderAbortCB(int totalslices, int thisslice, void *userdata)
 
- Public Types inherited from SoShape
enum  TriangleShape
 
- Public Types inherited from SoNode
enum  NodeType
 

Public Member Functions

void setAbortCallback (SoVolumeRenderAbortCB *func, void *userdata=NULL)
 
- Public Member Functions inherited from SoShape
virtual SoType getTypeId (void) const
 
virtual SbBool affectsState (void) const
 
virtual void notify (SoNotList *nl)
 
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
 
virtual void callback (SoCallbackAction *action)
 
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
 
const SoBoundingBoxCachegetBoundingBoxCache (void) const
 
- Public Member Functions inherited from SoNode
void setOverride (const SbBool state)
 
SbBool isOverride (void) const
 
void setNodeType (const NodeType type)
 
NodeType getNodeType (void) const
 
virtual SoNodecopy (SbBool copyconnections=FALSE) const
 
virtual void doAction (SoAction *action)
 
virtual void GLRenderBelowPath (SoGLRenderAction *action)
 
virtual void GLRenderInPath (SoGLRenderAction *action)
 
virtual void GLRenderOffPath (SoGLRenderAction *action)
 
virtual void getMatrix (SoGetMatrixAction *action)
 
virtual void handleEvent (SoHandleEventAction *action)
 
virtual void pick (SoPickAction *action)
 
virtual void search (SoSearchAction *action)
 
virtual void write (SoWriteAction *action)
 
virtual void audioRender (SoAudioRenderAction *action)
 
virtual void grabEventsSetup (void)
 
virtual void grabEventsCleanup (void)
 
virtual void startNotify (void)
 
SbUniqueId getNodeId (void) const
 
virtual SoChildListgetChildren (void) const
 
virtual void writeInstance (SoOutput *out)
 
virtual SoNodeaddToCopyDict (void) const
 
virtual void copyContents (const SoFieldContainer *from, SbBool copyconnections)
 
virtual SoFieldContainercopyThroughConnection (void) const
 
- Public Member Functions inherited from SoFieldContainer
void setToDefaults (void)
 
SbBool hasDefaultValues (void) const
 
SbBool fieldsAreEqual (const SoFieldContainer *container) const
 
void copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
 
SbBool set (const char *const fielddata)
 
void get (SbString &fielddata)
 
virtual int getFields (SoFieldList &l) const
 
virtual int getAllFields (SoFieldList &l) const
 
virtual SoFieldgetField (const SbName &name) const
 
virtual SoFieldgetEventIn (const SbName &name) const
 
virtual SoFieldgetEventOut (const SbName &name) const
 
SbBool getFieldName (const SoField *const field, SbName &name) const
 
SbBool enableNotify (const SbBool flag)
 
SbBool isNotifyEnabled (void) const
 
SbBool set (const char *fielddata, SoInput *input)
 
void get (SbString &fielddata, SoOutput *out)
 
virtual SbBool validateNewFieldValue (SoField *field, void *newval)
 
virtual void addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
 
SbBool getIsBuiltIn (void) const
 
virtual void getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
 
void setUserData (void *userdata) const
 
void * getUserData (void) const
 
- Public Member Functions inherited from SoBase
void ref (void) const
 
void unref (void) const
 
void unrefNoDelete (void) const
 
int32_t getRefCount (void) const
 
void touch (void)
 
SbBool isOfType (SoType type) const
 
virtual SbName getName (void) const
 
virtual void setName (const SbName &newname)
 
void addAuditor (void *const auditor, const SoNotRec::Type type)
 
void removeAuditor (void *const auditor, const SoNotRec::Type type)
 
const SoAuditorListgetAuditors (void) const
 
SbBool shouldWrite (void)
 
void assertAlive (void) const
 

Static Public Member Functions

static void initClass (void)
 
- Static Public Member Functions inherited from SoShape
static void getScreenSize (SoState *const state, const SbBox3f &boundingbox, SbVec2s &rectsize)
 
static float getDecimatedComplexity (SoState *state, float complexity)
 
- Static Public Member Functions inherited from SoNode
static uint32_t getCompatibilityTypes (const SoType &nodetype)
 
static SoNodegetByName (const SbName &name)
 
static int getByName (const SbName &name, SoNodeList &l)
 
static void initClasses (void)
 
static SbUniqueId getNextNodeId (void)
 
static int getActionMethodIndex (const SoType type)
 
static void getBoundingBoxS (SoAction *action, SoNode *node)
 
static void GLRenderS (SoAction *action, SoNode *node)
 
static void callbackS (SoAction *action, SoNode *node)
 
static void getMatrixS (SoAction *action, SoNode *node)
 
static void handleEventS (SoAction *action, SoNode *node)
 
static void pickS (SoAction *action, SoNode *node)
 
static void rayPickS (SoAction *action, SoNode *node)
 
static void searchS (SoAction *action, SoNode *node)
 
static void writeS (SoAction *action, SoNode *node)
 
static void audioRenderS (SoAction *action, SoNode *node)
 
static void getPrimitiveCountS (SoAction *action, SoNode *node)
 
- Static Public Member Functions inherited from SoFieldContainer
static void initCopyDict (void)
 
static void addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
 
static SoFieldContainercheckCopy (const SoFieldContainer *orig)
 
static SoFieldContainerfindCopy (const SoFieldContainer *orig, const SbBool copyconnections)
 
static void copyDone (void)
 
- Static Public Member Functions inherited from SoBase
static void initClass (void)
 
static SoType getClassTypeId (void)
 
static void addName (SoBase *const base, const char *const name)
 
static void removeName (SoBase *const base, const char *const name)
 
static void incrementCurrentWriteCounter (void)
 
static void decrementCurrentWriteCounter (void)
 
static SoBasegetNamedBase (const SbName &name, SoType type)
 
static int getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
 
static SbBool read (SoInput *input, SoBase *&base, SoType expectedtype)
 
static void setInstancePrefix (const SbString &c)
 
static void setTraceRefs (SbBool trace)
 
static SbBool getTraceRefs (void)
 
static SbBool connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
 
static SbBool readRoute (SoInput *input)
 

Public Attributes

SoSFEnum interpolation
 
SoSFEnum composition
 
SoSFBool lighting
 
SoSFVec3f lightDirection
 
SoSFFloat lightIntensity
 
SoSFEnum numSlicesControl
 
SoSFInt32 numSlices
 
SoSFBool viewAlignedSlices
 
- Public Attributes inherited from SoNode
 INVENTOR
 
 VRML1
 
 VRML2
 
 INVENTOR_1
 
 INVENTOR_2_0
 
 INVENTOR_2_1
 
 INVENTOR_2_5
 
 INVENTOR_2_6
 
 COIN_1_0
 
 COIN_2_0
 
 EXTENSION
 

Protected Member Functions

virtual void GLRender (SoGLRenderAction *action)
 
virtual void rayPick (SoRayPickAction *action)
 
virtual void generatePrimitives (SoAction *action)
 
virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center)
 
- Protected Member Functions inherited from SoShape
virtual const SoFieldDatagetFieldData (void) const
 
float getComplexityValue (SoAction *action)
 
virtual SbBool shouldGLRender (SoGLRenderAction *action)
 
void beginSolidShape (SoGLRenderAction *action)
 
void endSolidShape (SoGLRenderAction *action)
 
void GLRenderBoundingBox (SoGLRenderAction *action)
 
SbBool shouldPrimitiveCount (SoGetPrimitiveCountAction *action)
 
SbBool shouldRayPick (SoRayPickAction *const action)
 
void computeObjectSpaceRay (SoRayPickAction *const action)
 
void computeObjectSpaceRay (SoRayPickAction *const action, const SbMatrix &matrix)
 
virtual SoDetailcreateTriangleDetail (SoRayPickAction *action, const SoPrimitiveVertex *v1, const SoPrimitiveVertex *v2, const SoPrimitiveVertex *v3, SoPickedPoint *pp)
 
virtual SoDetailcreateLineSegmentDetail (SoRayPickAction *action, const SoPrimitiveVertex *v1, const SoPrimitiveVertex *v2, SoPickedPoint *pp)
 
virtual SoDetailcreatePointDetail (SoRayPickAction *action, const SoPrimitiveVertex *v, SoPickedPoint *pp)
 
void invokeTriangleCallbacks (SoAction *const action, const SoPrimitiveVertex *const v1, const SoPrimitiveVertex *const v2, const SoPrimitiveVertex *const v3)
 
void invokeLineSegmentCallbacks (SoAction *const action, const SoPrimitiveVertex *const v1, const SoPrimitiveVertex *const v2)
 
void invokePointCallbacks (SoAction *const action, const SoPrimitiveVertex *const v)
 
void beginShape (SoAction *const action, const TriangleShape shapetype, SoDetail *const detail=NULL)
 
void shapeVertex (const SoPrimitiveVertex *const v)
 
void endShape (void)
 
void generateVertex (SoPrimitiveVertex *const pv, const SbVec3f &point, const SbBool useTexFunc, const SoMultiTextureCoordinateElement *const tce, const float s, const float t, const SbVec3f &normal)
 
void generateVertex (SoPrimitiveVertex *const pv, const SbVec3f &point, const SbBool useTexFunc, const SoMultiTextureCoordinateElement *const tce, const float s, const float t, const float r, const SbVec3f &normal)
 
SbBool startVertexArray (SoGLRenderAction *action, const SoCoordinateElement *coords, const SbVec3f *pervertexnormals, const SbBool texpervertex, const SbBool colorpervertex)
 
void finishVertexArray (SoGLRenderAction *action, const SbBool vbo, const SbBool normpervertex, const SbBool texpervertex, const SbBool colorpervertex)
 
- Protected Member Functions inherited from SoNode
virtual SbBool readInstance (SoInput *in, unsigned short flags)
 
- Protected Member Functions inherited from SoBase
virtual void destroy (void)
 
SbBool hasMultipleWriteRefs (void) const
 
SbBool writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
 
void writeFooter (SoOutput *out) const
 
virtual const char * getFileFormatName (void) const
 

Friends

class SoVolumeRenderP
 

Additional Inherited Members

- Protected Types inherited from SoBase
enum  BaseFlags
 
- Static Protected Member Functions inherited from SoNode
static const SoFieldData ** getFieldDataPtr (void)
 
static void setNextActionMethodIndex (int index)
 
static int getNextActionMethodIndex (void)
 
static void incNextActionMethodIndex (void)
 
static void setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)
 
- Static Protected Member Functions inherited from SoBase
static uint32_t getCurrentWriteCounter (void)
 
- Protected Attributes inherited from SoNode
SbUniqueId uniqueId
 
- Protected Attributes inherited from SoFieldContainer
SbBool isBuiltIn
 
- Static Protected Attributes inherited from SoNode
static SbUniqueId nextUniqueId
 
static int nextActionMethodIndex
 

Detailed Description

Render the full volume.

Insert a node of this type after an SoVolumeData node in the scene graph to render the full volume data set.

See also
SoOrthoSlice, SoObliqueSlice, SoVolumeFaceSet, SoVolumeIndexedFaceSet
SoVolumeTriangleStripSet, SoVolumeIndexedTriangleStripSet

Member Typedef Documentation

◆ SoVolumeRenderAbortCB

AbortCode SoVolumeRender::SoVolumeRenderAbortCB

The function signature for callback function pointers to be passed in to SoVolumeRender::setAbortCallback().

totalslices is the total number of textured slices that is expected to be rendered, unless the callback choose to abort or skip any of them.

thisslice is the index number of the next slice to render. Note that they are rendered back-to-front, and that they are numbered from 1 to totalslices.

userdata is the second argument given to SoVolumeRender::setAbortCallback() when the callback was set up.

Member Enumeration Documentation

◆ Interpolation

Enumeration of available types of voxel color interpolation.

Enumerator
NEAREST 

For "in between" pixels of the screen rasterization, pick the color of the nearest voxel. Will give sharp edges and a distinct blocky look.

LINEAR 

For "in between" pixels of the screen rasterization, interpolate by averaging the colors of several of the nearest voxels. Will give a smoother appearance, but sacrifies some "correctness" for appearance.

◆ Composition

Enumeration of available types of composition for partly translucent volumes.

Enumerator
MAX_INTENSITY 

For each on-screen projected pixel, the voxel with the highest alpha intensity along that projection ray will be rendered.

This is for instance useful in medical imaging as a contrast enhancing operator for visualizing blood-flows.

Note that the availability of this composition mode for rendering with 2D- and 3D-texture slices will be dependent on features of the underlying rendering library.

(Specifically, the OpenGL driver must support glBlendEquation(), which is part of the optional "imaging" API-subset of OpenGL version 1.2 and later.)

SUM_INTENSITY 

For each on-screen projected pixel, the intensity of all voxels along that projection ray will be summed up before rendering.

This gives an appearance similar to medical X-ray images. The blending function is known as the "attenuate" operator.

Note that the availability of this composition mode for rendering with 2D- and 3D-texture slices will be dependent on features of the underlying rendering library.

(Specifically, the OpenGL driver must support glBlendEquation(), which is part of the optional "imaging" API-subset of OpenGL version 1.2 and later.)

ALPHA_BLENDING 

Composes volume by rendering voxels with higher opacity such that they progressively obscures voxels behind them.

This is an approximation of the visual appearance of the penetration and reflection of light through a transparent material.

The blending function for this is known as the "over" operator.

◆ NumSlicesControl

Enumeration of strategies for how to render the slices of the volume.

Enumerator
ALL 

Always render as many slices as there are voxels in the depth dimension. This is the default value.

Please note that SoVolumeRender::NumSlicesControl will always be considered as SoVolumeRender::ALL if the SoVolumeRender::numSlices field is less or equal to 0.

MANUAL 

Render as many slices as given by the SoVolumeRender::numSlices field.

AUTOMATIC 

The number of slices to render will be calculated as follows:

unsigned int numslices = complexity * 2.0f * this->numSlices;

Where "complexity" is the current SoComplexity::value setting in the scene graph traversal state. The default complexity value for a scene graph with no SoComplexity node(s) is 0.5.

For "this->numSlices", see SoVolumeRender::numSlices.

◆ AbortCode

The set of valid values that should be returned from a function set up in SoVolumeRender::setAbortCallback().

Enumerator
CONTINUE 

Continue rendering in the usual manner.

ABORT 

Don't render any more textured slices of the volume.

SKIP 

Skip the next textured slice, and resume rendering on the next after that. (The abort callback function will still be called again.)

Member Function Documentation

◆ setAbortCallback()

void SoVolumeRender::setAbortCallback ( SoVolumeRenderAbortCB func,
void *  userdata = NULL 
)

Lets the application programmer supply a callback function, by which it will be possible to either prematurely abort the rendering of a set of slices, or to skip certain slices.

Both of these measures are of course optimizations of rendering performance controlled from client code.

◆ rayPick()

void SoVolumeRender::rayPick ( SoRayPickAction action)
protectedvirtual

Picking of a volume doesn't work in quite the same manner as picking polygon geometry: the SoPickedPoint set up in the SoRayPickAction class will only contain the entry point of the ray into the volume.

For further picking information, grab the detail object and cast it to an SoVolumeRenderDetail (after first checking that it is of this type, of course).

Reimplemented from SoShape.

References SoShape::computeObjectSpaceRay(), SoAction::getState(), SoVolumeDetail::setDetails(), SoShape::shouldRayPick(), and SoBase::touch().

Member Data Documentation

◆ interpolation

SoSFEnum SoVolumeRender::interpolation

How to interpolate color values when rendering "in between" voxels. See SoVolumeRender::Interpolation.

Default value is SoVolumeRender::LINEAR.

◆ composition

SoSFEnum SoVolumeRender::composition

How to compose the projected volume rendering. See SoVolumeRender::Composition.

Default value is SoVolumeRender::ALPHA_BLENDING.

◆ numSlicesControl

SoSFEnum SoVolumeRender::numSlicesControl

Specifies a strategy to use for calculating the number of slices to use for the visualization. The more slices, the better quality and more correct the visualization will be, but the trade-off is that it will also influence the rendering performance.

The default value is SoVolumeRender::ALL.

(The rendering performance can be severely improved by changing this field's value to either SoVolumeRender::MANUAL or SoVolumeRender::AUTOMATIC, and then tuning the SoVolumeRender::numSlices field.)

◆ numSlices

SoSFInt32 SoVolumeRender::numSlices

Decides how many slices to render if SoVolumeRender::numSlicesControl is set to either SoVolumeRender::MANUAL or SoVolumeRender::AUTOMATIC.

For MANUAL, it sets an absolute number. For AUTOMATIC, a calculation will be done based on the value of this field and the current SoComplexity::value setting in the scene graph traversal state.

Note that the default value of the field is 0.


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