SoObliqueSlice Class Reference

Render a slice of the volume data, with any orientation. More...

#include <VolumeViz/nodes/SoObliqueSlice.h>

Inheritance diagram for SoObliqueSlice:

Public Types
enum	AlphaUse { ALPHA_AS_IS , ALPHA_OPAQUE , ALPHA_BINARY }
enum	Interpolation { NEAREST , LINEAR }

Static Public Member Functions
static void	initClass (void)

Public Attributes
SoSFEnum	alphaUse
SoSFNode	alternateRep
SoSFEnum	interpolation
SoSFPlane	plane

Protected Member Functions
virtual void	computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center)
virtual void	generatePrimitives (SoAction *action)
virtual void	GLRender (SoGLRenderAction *action)
virtual void	rayPick (SoRayPickAction *action)
virtual SbBool	readInstance (SoInput *in, unsigned short flags)
virtual void	write (SoWriteAction *action)

Detailed Description

Render a slice of the volume data, with any orientation.

Insert a node of this type after an SoVolumeData node in the scene graph to render a single slice from the full volume data set. The slice is specified as a plane with an orientation and position within the volume.

Rendering of an oblique slice

Here is a simple example, in the form of an iv-file:

#Inventor V2.1 ascii

SoVolumeData { fileName "ENGINE.VOL" }
 
Separator {
  SoTransferFunction { }  
  DEF clipper ClipPlaneManip { }
  SoVolumeRender { }   
}

Separator {
  SoTransferFunction { predefColorMap GLOW }  
  SoObliqueSlice {
    interpolation LINEAR 
    alphaUse ALPHA_AS_IS
    plane = USE clipper . plane
  }
}

Please note that SoObliqueSlice will not work with older OpenGL drivers as they usually lack 3D-texture support. OpenGL drivers of version 1.2 and onwards supports 3D-texturing, as does older OpenGL drivers with the GL_EXT_texture3D extension. If none of these are available, a warning message will be printed using Coin's SoDebugError::postWarning().

See also

SoVolumeRender, SoOrthoSlice

SoVolumeTriangleStripSet, SoVolumeIndexedTriangleStripSet,

SoVolumeIndexedFaceSet, SoVolumeFaceSet

Since

SIM Voleon 2.0

Member Enumeration Documentation

AlphaUse

enum SoObliqueSlice::AlphaUse

Enumerator
ALPHA_AS_IS	The alpha channel is rendered 'as-is'.
ALPHA_OPAQUE	The alpha channel is ignored making the slice opaque.
ALPHA_BINARY	All alpha values not equal to 0 are treated as value 1.0f.

Interpolation

enum SoObliqueSlice::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.

Member Data Documentation

alphaUse

SoSFEnum SoObliqueSlice::alphaUse

How the alpha channel should be treated during rendering. See SoObliqueSlice::AlphaUse.

Default value is SoObliqueSlice::ALPHA_AS_IS

alternateRep

SoSFNode SoObliqueSlice::alternateRep

NOTE: support for this field not yet implemented in SIM Voleon.

Since

SIM Voleon 2.0

interpolation

SoSFEnum SoObliqueSlice::interpolation

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

Default value is SoObliqueSlice::LINEAR.

plane

SoSFPlane SoObliqueSlice::plane

The plane defining the slice.

Default value is an XY plane.

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

• SoObliqueSlice.h
• ObliqueSlice.cpp