Open Inventor Release 2024.1.2
 
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SoVolumeFaceSet Class Reference

VolumeViz Polygonal face shape node for volume data. More...

#include <VolumeViz/nodes/SoVolumeFaceSet.h>

+ Inheritance diagram for SoVolumeFaceSet:

Public Member Functions

virtual SoType getTypeId () const
 Returns the type identifier for this specific instance.
 
 SoVolumeFaceSet ()
 Constructor.
 
- Public Member Functions inherited from SoFaceSet
 SoFaceSet ()
 Creates a face set node with default settings.
 
- Public Member Functions inherited from SoVertexShape
SoNormalCache * getNormalCache () const
 Returns the current normal cache, or NULL if there is none.
 
SoTangentCache * getTangentCache () const
 Returns the current tangent cache, or NULL if there is none.
 
- Public Member Functions inherited from SoShape
virtual SbBool affectsState () const
 Overrides default method on SoNode.
 
ShapeType getShapeType ()
 Gets the current shape Full Scene Antialiasing type.
 
- Public Member Functions inherited from SoNode
virtual void setOverride (const SbBool state)
 Turns the override flag on or off.
 
virtual SbBool isOverride () const
 Returns the state of the override flag.
 
virtual SoNodecopy (SbBool copyConnections=FALSE) const
 Creates and returns an exact copy of the node.
 
virtual void touch ()
 Marks an instance as modified, simulating a change to it.
 
- 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 SoFieldgetField (const SbName &fieldName) const
 Returns a the field of this object whose name is fieldName.
 
virtual SoFieldgetEventIn (const SbName &fieldName) const
 Returns a the eventIn with the given name.
 
virtual SoFieldgetEventOut (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 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.
 
- Public Member Functions inherited from SoVolumeGeometry
 SoVolumeGeometry ()
 Constructor.
 
virtual ~SoVolumeGeometry ()
 Destructor.
 
virtual void setRenderProgress (SoProgressIndicator *ps)
 Set an application defined SoProgressIndicator object which will raise an event before and after the rendering task, before and after each subtask (in this case: Texture creation and Geometry creation) and after each step in the subtasks which represents in most cases individual tiles of data.
 

Static Public Member Functions

static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoFaceSet
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoNonIndexedShape
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoVertexShape
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoShape
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SbBool isPrimitiveRestartAvailable (SoState *state=NULL)
 Returns TRUE if the primitive restart feature is available.
 
- Static Public Member Functions inherited from SoNode
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SoNodegetByName (const SbName &name)
 A node's name can be set using SoBase::setName().
 
static int getByName (const SbName &name, SoNodeList &list)
 A node's name can be set using SoBase::setName().
 
- 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

SoSFBool clipGeometry
 Specifies to clip the geometry at the volume boundaries.
 
SoSFFloat offset
 Sets an offset value used for computing the texture coordinates.
 
SoSFEnum interpolation
 Interpolation mode.
 
- Public Attributes inherited from SoFaceSet
SoMFInt32 numVertices
 Number of vertices per face or per contour.
 
- Public Attributes inherited from SoNonIndexedShape
SoSFInt32 startIndex
 Index of first coordinate of shape.
 
- Public Attributes inherited from SoVertexShape
SoSFNode vertexProperty
 vertex property node.
 
- Public Attributes inherited from SoShape
SoSFBool boundingBoxIgnoring
 Whether to ignore this node during bounding box traversal.
 

Deprecated

enum  Interpolation {
  NEAREST = SoVolumeShape::NEAREST ,
  LINEAR = SoVolumeShape::LINEAR
}
 

Additional Inherited Members

- Public Types inherited from SoShape
enum  ShapeType {
  POINTS ,
  LINES ,
  POLYGONS ,
  TEXT
}
 Basic type for antialiased rendering for this shape (Do not consider the SoDrawStyle property currently in the state). More...
 

Detailed Description

VolumeViz Polygonal face shape node for volume data.

This node defines a shape which is the intersection of the volume data defined by an SoVolumeData node and the 3D shape formed by constructing faces (polygons) from vertices located at the coordinates specified in the vertexProperty field (from SoVertexShape) or the current inherited state. For optimal performance, use of the vertexProperty field is recommended.

The shape defined by this intersection is textured using the data from the current SoVolumeData node and SoTransferFunction node. The interpolation field controls how the texture is interpolated. Texture coordinates are automatically computed for each vertex based on its position relative to the 3D extent of the volume. If texture coordinates are specified, they are ignored.

This node can be used to create custom "slices" through the volume, for example a cylinder slice. It can be considered a generalization of the SoOrthoSlice, SoObliqueSlice, SoFenceSlice, etc features. But note:

  • Compared to an equivalent standard slice (e.g. SoOrthoSlice), the rendering may be slightly different due to positioning and interpolation.
  • The standard slices (e.g. SoOrthoSlice) have "two-sided lighting" enabled by default as a convenience. This is not true for volume geometry nodes (which have the same default as their corresponding standard geometry node), so the "back" side of the geometry will not be lighted unless you enable two-sided lighting using an SoShapeHints node.

When set to FALSE, the clipGeometry field allows rendering of the portion of the geometry that does not intersect the volume data. This portion is not textured and is rendered as a regular SoFaceSet.

This node uses 3D texturing and is not available if the hardware does not support this feature.

SoVolumeFaceSet uses the coordinates in order, starting with the first one. Each face has a number of vertices specified by a value in the numVertices field. For example, an SoVolumeFaceSet with numVertices of [3,4,4] would use coordinates 1, 2, and 3 for the first face, coordinates 4, 5, 6, and 7 for the second face, and coordinates 8, 9, 10, and 11 for the third. For improved performance, arrange all the faces with only 3 vertices at the beginning of the list, then all faces with 4 vertices, and finally all other faces.

The number of values in the numVertices field indicates the number of faces in the set.

The coordinates of the face set are transformed by the current cumulative transformation. The faces are drawn with the current light model and drawing style.

Treatment of the current material and normal binding is as follows: The PER_PART and PER_FACE bindings specify a material or normal for each face. The _INDEXED bindings are equivalent to their non-indexed counterparts. The default material binding is OVERALL. The default normal binding is PER_VERTEX.

If any normals (or materials) are specified, Open Inventor assumes you have provided the correct number of them, as indicated by the binding. You will see unexpected results if you specify fewer normals (or materials) than the shape requires. If no normals are specified, they will be generated automatically.

Notes:

  • A face set may render or pick incorrectly if any of its polygons are self-intersecting or non-planar.
  • The volume size and orientation (like geometry) can be modified by transformation nodes in the scene graph and this in turn modifies the appearance of volume rendering nodes like SoVolumeFaceSet. However the same transformation must be applied to the volume data node and all volume rendering nodes associated with that volume. So effectively any transformation nodes that affect the volume must be placed before the volume data node.
  • For performance concerns, an instance of SoVolumeFaceSet should not be used multiple times in the scene graph. In order to have the best trade-off between performances and memory footprint use a single SoVertexProperty node shared by several instances of SoVolumeFaceSet.
  • Composition with Multiple Data:
    It is possible to compose datasets that have different dimensions, tile sizes and transformations.
    In order to help fetch the correct data values in custom shaders, texture coordinates conversion functions are provided in the VolumeViz/vvizStructure.h shader include.
    For instance,
    vec3 VVizTextureToTextureVec(in VVizDataSetId datasetSrc, in VVizDataSetId datasetDst, in vec3 texCoord);
    vec3 VVizTextureToTextureVec(in VVizDataSetId datasetSrc, in VVizDataSetId datasetDst, in vec3 texCoord)
    Converts the input vector from the texture space of one dataset to the texture space of another datas...
    can be used to convert texture coordinates related to one dataset to texture coordinates related to another dataset.
    The conversion is based solely on the transformations applied to each dataset, which are defined by their model matrix and their extent.
    Please note that the model matrix of a dataset is defined by to the SoTransformation nodes that are placed before the SoDataSet node in the order of the traversal.

FILE FORMAT/DEFAULT

    VolumeFaceSet {
    vertexProperty NULL
    startIndex 0
    numVertices -1
    clipGeometry TRUE
    offset 0
    interpolation LINEAR
    }

ACTION BEHAVIOR

    SoGLRenderAction
    Draws faces based on the current coordinates, normals, materials, drawing style, and so on.

    SoRayPickAction
    Picks faces based on the current coordinates and transformation. Details about the intersection are returned in an SoFaceDetail.

    SoGetBoundingBoxAction
    Computes the bounding box that encloses all vertices of the face set with the current transformation applied to them. Sets the center to the average of the coordinates of all vertices.

    SoCallbackAction
    If any triangle callbacks are registered with the action, they will be invoked for each successive triangle generated from each face in the set.

SEE ALSO

SoVolumeData, SoTransferFunction, SoROI, SoCoordinate3, SoDrawStyle, SoVolumeIndexedFaceSet, SoVolumeIndexedTriangleStripSet, SoVolumeTriangleStripSet, SoFaceDetail, SoVertexProperty

Definition at line 179 of file SoVolumeFaceSet.h.

Member Enumeration Documentation

◆ Interpolation

Enumerator
NEAREST 

OpenGL "nearest neighbor" interpolation.

LINEAR 

OpenGL linear interpolation (Default).

This implies bi-linear interpolation for 2D textures (e.g. SoOrthoSlice, SoObliqueSlice, SoVolumeSkin, SoFenceSlice) and tri-linear interpolation for 3D textures (SoVolumeRender, SoVolumeGeometry).

Definition at line 214 of file SoVolumeFaceSet.h.

Constructor & Destructor Documentation

◆ SoVolumeFaceSet()

SoVolumeFaceSet::SoVolumeFaceSet ( )

Constructor.

Member Function Documentation

◆ getClassTypeId()

static SoType SoVolumeFaceSet::getClassTypeId ( )
static

Returns the type identifier for this class.


◆ getTypeId()

virtual SoType SoVolumeFaceSet::getTypeId ( ) const
virtual

Returns the type identifier for this specific instance.

Reimplemented from SoFaceSet.

Member Data Documentation

◆ clipGeometry

SoSFBool SoVolumeFaceSet::clipGeometry

Specifies to clip the geometry at the volume boundaries.


The SoROI node also affects the clipping process. Default is TRUE.

Definition at line 192 of file SoVolumeFaceSet.h.

◆ interpolation

SoSFEnum SoVolumeFaceSet::interpolation

Interpolation mode.

Use enum SoVolumeShape::Interpolation. Default is LINEAR. NOTE: In most cases on modern graphics boards, indexed textures are used, so this refers to interpolation of volume data values.

Definition at line 210 of file SoVolumeFaceSet.h.

◆ offset

SoSFFloat SoVolumeFaceSet::offset

Sets an offset value used for computing the texture coordinates.


The texture coordinate for each vertex will be taken from a point offset units away from the vertex. The offset is measured in the direction of the vertex normal. By default the offset is equal to 0 (no offset). When using this feature, a vertex normal must exist for every vertex. If vertex normals are not supplied, Open Inventor will compute vertex normals in the usual way except that the crease angle will be fixed at PI in order to assure that a vertex normal is computed at every vertex.

Definition at line 205 of file SoVolumeFaceSet.h.


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