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VolPack(3) Library Functions Manual VolPack(3)


VolPack - introduction to VolPack, a library for volume rendering


#include <volpack.h>

cc file.c -lvolpack -lm


VolPack is a portable software library for volume rendering. It is based on a new family of fast volume rendering algorithms (see Philippe Lacroute and Marc Levoy, Fast Volume Rendering Using a Shear-Warp Factorization of the Viewing Transformation, Proc. SIGGRAPH '94, in Computer Graphics, Annual Conference Series, 1994, pp. 451-458). For a tutorial introduction to the library see the VolPack User's Guide.

The following list includes all of the functions in the library grouped by general function, along with the corresponding man pages.

Rendering Contexts

vpCreateContext vpCreateContext(3)
vpDestroyContext vpCreateContext(3)


vpSetVolumeSize vpSetVolumeSize(3)
vpSetVoxelSize vpSetVoxelSize(3)
vpSetVoxelField vpSetVoxelField(3)
vpFieldOffset vpSetVoxelField(3)
vpSetRawVoxels vpSetRawVoxels(3)
vpVolumeNormals vpVolumeNormals(3)
vpScanlineNormals vpScanlineNormals(3)
vpNormalIndex vpNormalIndex(3)
vpNormal vpNormalIndex(3)

Classified Volumes

vpSetClassifierTable vpSetClassifierTable(3)
vpClassifyVolume vpClassifyVolume(3)
vpDestroyClassifiedVolume vpClassifyVolume(3)
vpClassifyScalars vpClassifyScalars(3)
vpClassifyScanline vpClassifyScanline(3)

Min-Max Octrees

vpCreateMinMaxOctree vpCreateMinMaxOctree(3)
vpMinMaxOctreeThreshold vpCreateMinMaxOctree(3)
vpDestroyMinMaxOctree vpCreateMinMaxOctree(3)
vpOctreeMask vpOctreeMask(3)

View Transformations

vpCurrentMatrix vpCurrentMatrix(3)
vpIdentityMatrix vpIdentityMatrix(3)
vpTranslate vpTranslate(3)
vpRotate vpRotate(3)
vpScale vpScale(3)
vpMultMatrix vpMultMatrix(3)
vpSetMatrix vpSetMatrix(3)
vpWindow vpWindow(3)
vpWindowPHIGS vpWindowPHIGS(3)

Shading and Lighting

vpSetLookupShader vpSetLookupShader(3)
vpSetShadowLookupShader vpSetShadowLookupShader(3)
vpSetLight vpSetLight(3)
vpSetMaterial vpSetMaterial(3)
vpShadeTable vpShadeTable(3)
vpSetDepthCueing vpSetDepthCueing(3)


vpSetImage vpSetImage(3)
vpRenderClassifiedVolume vpRenderRawVolume(3)
vpRenderRawVolume vpRenderRawVolume(3)

State Variables

vpEnable vpEnable(3)
vpSeti vpSeti(3)
vpSetd vpSeti(3)
vpGeti vpGeti(3)
vpGetd vpGeti(3)
vpGetp vpGeti(3)
vpGetMatrix vpGetMatrix(3)
vpGetMaterial vpGetvpSetMaterial(3)
vpGetLight vpGetvpSetLight(3)
vpSetCallback vpSetCallback(3)
vpSetClientData vpSetClientData(3)

File I/O

vpLoadClassifiedVolume vpLoadRawVolume(3)
vpLoadMinMaxOctree vpLoadRawVolume(3)
vpLoadRawVolume vpLoadRawVolume(3)
vpLoadContext vpLoadRawVolume(3)
vpStoreClassifiedVolume vpStoreRawVolume(3)
vpStoreMinMaxOctree vpStoreRawVolume(3)
vpStoreRawVolume vpStoreRawVolume(3)
vpStoreContext vpStoreRawVolume(3)

Utility Functions

vpRamp vpRamp(3)
vpExtract vpExtract(3)
vpTranspose vpTranspose(3)
vpResample vpResample(3)
vpSetFilter vpSetFilter(3)
vpBoxFilter vpBoxFilter(3)
vpLinearFilter vpBoxFilter(3)
vpBicubicFilter vpBoxFilter(3)
vpGaussianFilter vpBoxFilter(3)
vpIdentity3 LinearAlgebra(3)
vpIdentity4 LinearAlgebra(3)
vpSetVector3 LinearAlgebra(3)
vpSetVector4 LinearAlgebra(3)
vpNormalize3 LinearAlgebra(3)
vpMatrixVectorMult4 LinearAlgebra(3)
vpMatrixMult4 LinearAlgebra(3)
vpCrossProduct LinearAlgebra(3)
vpSolveSystem4 LinearAlgebra(3)

Error Handling

vpGetError vpGetError(3)
vpGetErrorString vpGetError(3)


vpSetDebug vpSetDebug(3)
vpTracePixel vpTracePixel(3)
vpGetImage vpGetvpSetImage(3)
vpBruteForceRender vpBruteForceRender(3)


The following data types are declared in the VolPack header file (volpack.h):

An opaque handle for a rendering context. A context contains all of the information required to render a volume, including classification and shading parameters, the view transformation, a description of the format of the volume data, and private data structures used by the rendering routines.
A result code. Most of the library routines return the code VP_OK upon successful completion, or an error code if the library call fails.
A three-element linear array of double-precision elements (double[3]).
A four-element linear array of double-precisions elements (double[4]).
A three-by-three array of double-precision elements (double[3][3]).
A four-by-four array of double-precision elements (double[4][4]).


Source code and documentation for VolPack are available free via the World Wide Web ( or by anonymous ftp (


VolPack User's Guide