Isosurface property node More...

#include <VolumeViz/nodes/SoVolumeIsosurface.h>

Inheritance diagram for SoVolumeIsosurface:

Public Member Functions
virtual SoType	getTypeId () const
	Returns the type identifier for this specific instance.

	SoVolumeIsosurface ()
	Constructor.

Public Member Functions inherited from SoVolumeShader
	SoVolumeShader ()
	Constructor.

virtual SoFragmentShader *	setFragmentShader (int pos, const SbString &filenameOrSource, SoShaderObject::SourceType sourceType=SoShaderObject::FILENAME)
	Creates a fragment shader with the given filename and add it at the given pos.

virtual SoVertexShader *	setVertexShader (int pos, const SbString &filenameOrSource, SoShaderObject::SourceType sourceType=SoShaderObject::FILENAME)
	Creates a vertex shader with the given filename and adds it at the given pos.

Public Member Functions inherited from SoShaderProgram
	SoShaderProgram ()
	Constructor.

SoFragmentShader *	getFragmentShader (int pos) const
	Returns the fragment shader at the specified position.

SoVertexShader *	getVertexShader (int pos) const
	Returns the vertex shader at the specified position.

SoGeometryShader *	getGeometryShader (int pos) const
	Returns the geometry shader at the specified position.

virtual SoGeometryShader *	setGeometryShader (int pos, const SbString &filenameOrSource, SoShaderObject::SourceType sourceType=SoShaderObject::FILENAME)
	Convenience method to create a geometry shader with the specified filename and add it at the specified position.

virtual SoComputeShader *	setComputeShader (int pos, const SbString &filenameOrSource, SoShaderObject::SourceType sourceType=SoShaderObject::FILENAME)
	Convenience method to create a compute shader with the specified filename and add it at the specified position.

SoTessellationControlShader *	getTessellationControlShader (int pos) const
	Returns the tessellation control shader at the specified position.

SoTessellationEvaluationShader *	getTessellationEvaluationShader (int pos) const
	Returns the tessellation evaluation shader at the specified position.

virtual SoTessellationControlShader *	setTessellationControlShader (int pos, const SbString &filenameOrSource, SoShaderObject::SourceType sourceType=SoShaderObject::FILENAME)
	Convenience method to create a tessellation control shader with the specified filename and add it at the specified position.

virtual SoTessellationEvaluationShader *	setTessellationEvaluationShader (int pos, const SbString &filenameOrSource, SoShaderObject::SourceType sourceType=SoShaderObject::FILENAME)
	Convenience method to create a tessellation evaluation shader with the specified filename and add it at the specified position.

SoShaderParameterImage *	addShaderParameterImage (const SbString &name, SoTexture *tex)
	Convenience method to create an SoShaderParameterImage with the specified name and value and add it to this shader program.

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 SoNode *	copy (SbBool copyConnections=FALSE) const
	Creates and returns an exact copy of the node.

virtual SbBool	affectsState () const
	Returns TRUE if a node has an effect on the state during traversal.

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 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 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 SoVolumeShader
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static SbBool	isSupported (SoState *state=NULL)
	Returns TRUE if SoVolumeShader is supported by the current graphics board.

Static Public Member Functions inherited from SoShaderProgram
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static unsigned int	getNumReservedTextures ()
	Returns the number of reserved texture units.

Static Public Member Functions inherited from SoNode
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static SoNode *	getByName (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
SoMFFloat	isovalues
	Specifies the list of isovalues to display.

Public Attributes inherited from SoVolumeShader
SoSFBool	forVolumeOnly
	Set to TRUE if the shader should be called for volume rendering (SoVolumeRender).

SoSFBool	interpolateOnMove
	When set to FALSE, interpolation between LDM tiles (across the tile boundary) is not done when rendering in interactive mode.

Public Attributes inherited from SoShaderProgram
SoMFNode	shaderObject
	Specifies the list of shader objects (i.e., vertex shaders, geometry and fragment shaders) which form the shader program.

SoSFEnum	geometryInputType
	Specifies the input primitive type of the current geometry shader if any (not used otherwise).

SoSFEnum	geometryOutputType
	Specifies the output primitive type of the current geometry shader if any (not used otherwise).

SoSFBool	vertexProgramTwoSide
	If set to TRUE, vertex shaders will operate in two-sided color mode.

SoSFBool	shadowShader
	Only used when an SoShadowGroup is active.

SoSFInt32	maxGeometryOutputVertices
	Set the maximum number of vertices the geometry shader will emit in one invocation.

SoSFBool	generateTransparency
	If set to TRUE, then shapes affected by this shader will be considered transparent.

SoSFInt32	patchLength
	Set the length of the fixed-size collection of vertices used by tessellation shaders.

SoMFNode	bufferObjects
	Specifies a list of SoShaderParameterBufferObject to use with this shader.

SoMFNode	images
	Specifies a list of SoShaderParameterImage nodes to use with this shader.

Additional Inherited Members
Public Types inherited from SoVolumeShader
enum	ShaderPosition { GEOMETRY_MAIN =0 , DATA_COMBINE_FUNCTION , GET_DATA_FUNCTION , FRAGMENT_COMPUTE_COLOR , VERTEX_MAIN , FRAGMENT_MAIN , VERTEX_POSTPROCESSING , CLIPPING_FUNCTION , TESS_VERTEX_SHIFT , CUSTOM_SHADER = 64 }
	Specifies the position of the shader pipeline stages in the field shaderObject. More...

Public Types inherited from SoShaderProgram
enum	GeometryInputType { POINTS_INPUT = GL_POINTS , LINES_INPUT = GL_LINES , TRIANGLES_INPUT = GL_TRIANGLES }
	Geometry input type. More...

enum	GeometryOutputType { POINTS_OUTPUT = GL_POINTS , LINE_STRIP_OUTPUT = GL_LINE_STRIP , TRIANGLE_STRIP_OUTPUT = GL_TRIANGLE_STRIP }
	Geometry ouput type. More...

Detailed Description

Isosurface property node

This property node causes subsequent SoVolumeRender nodes to draw isosurfaces instead of classical volume rendering of the volume data defined by the current SoVolumeData.

This is functionally equivalent to using an SoVolumeDataDrawStyle node with the style field set to ISOSURFACE, but is much simpler when you only need to display an iso surface.

The isosurfaces are only rendered, not geometrically computed. So it is not possible to directly get the geometry corresponding to the rendered isosurface. (The MeshViz extension includes algorithms to extract an isosurface as geometry, see MoMeshIsosurface.)

The isovalues to display are specified in the isovalues field.

You may not use both SoVolumeShader and SoVolumeIsosurface with the same SoVolumeRender node. However since Open Inventor 7.1 it is possible to use both SoVolumeRenderingQuality and SoVolumeIsosurface with SoVolumeRender.

Remember this is a shader node. The effect will usually be undesirable if it is applied to standard geometry (polygons, lines, etc). Therefore applications should generally keep the volume visualization nodes and standard geometry nodes separate in the scene graph (i.e. under different SoSeparator nodes).

The multiple fields SoMaterial::diffuseColor, SoMaterial::transparency, SoMaterial::specularColor, and SoMaterial::shininess of the current SoMaterial specify the material of each isosurface. All isosurfaces share the first SoMaterial::specularColor and SoMaterial::shininess. The first material will be for the first isosurface, the second material for the second isosurface, and so on.

Surfaces are lighted with the first directional light found in the scene graph. No other lights affect the isosurface. Note: The isosurfaces are always lighted, regardless of the value of the SoVolumeRenderingQuality lighting and deferredLighting fields.

The isosurface displays the boundary between 2 different values, similar to the marching cubes algorithms. In other words, a voxel is part of the isosurface if the ray entry and exit values for the voxel are different and include the specified isosurface value in their range. If you render, for example, the isosurface 100 of a volume data containing the value 100 everywhere, nothing will be rendered.

Because of linear interpolation, basic isosurface may not render correctly on segmented dataset like label field. In this case, you should use the SoVolumeRenderingQuality::segmentedInterpolation or SoVolumeRenderingQuality::colorInterpolation fields. Default Linear interpolation may also generate rough result even for scalar datasets. For a smoother surface, you may have to use cubic interpolation. Please refer to SoVolumeShape::interpolation for details.

Because this node is derived from SoVolumeShader, IVVR_FIRST_RESERVED_TEXTURE_UNIT applies to it. See SoVolumeShader for more information.

Note: 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 SoVolumeIsosurface.
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 <B> before </B>
the volume data node.

FILE FORMAT/DEFAULT

isovalues

[]

ACTION BEHAVIOR

SoGLRenderAction

Constructor & Destructor Documentation

◆ SoVolumeIsosurface()

SoVolumeIsosurface::SoVolumeIsosurface ( )

Constructor.

Member Function Documentation

◆ getClassTypeId()

static SoType SoVolumeIsosurface::getClassTypeId ( )

static

Returns the type identifier for this class.

◆ getTypeId()

virtual SoType SoVolumeIsosurface::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoVolumeShader.

Member Data Documentation

◆ isovalues

SoMFFloat SoVolumeIsosurface::isovalues

Specifies the list of isovalues to display.

Definition at line 138 of file SoVolumeIsosurface.h.

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

VolumeViz/nodes/SoVolumeIsosurface.h

Open Inventor Release 2024.2.1

Public Member Functions

Static Public Member Functions

Public Attributes

Additional Inherited Members