Number of bytes from the beginning of one voxel to the beginning of
the next voxel in the first array dimension.
ystride
Number of bytes from the beginning of one voxel to the beginning of
the next voxel in the second array dimension.
zstride
Number of bytes from the beginning of one voxel to the beginning of
the next voxel in the third array dimension.
DESCRIPTION
vpSetRawVoxels is used to specify a 3D array that contains the
volume data. The array must be large enough for the volume dimensions
specified with vpSetVolumeSize and the voxel size specified with
vpSetVoxelSize. The data in the array may be initialized before
or after calling vpSetRawVoxels.
Some of the VolPack routines operate faster if the volume is stored in
z-major order (xstride < ystride < zstride) but it is not
strictly necessary.
The voxel array is not automatically deallocated when the context is
destroyed with vpDestroyContext. The application is responsible
for managing the memory associated with the volume array.
The voxel array can be a very large data structure, possibly larger
than available main memory. It is sometimes possible to precompute
the optimized data structures required for the fast rendering
algorithm without explicitly allocating a voxel array. See
vpClassifyScalars(3).
During the call to vpSetRawVoxels, any existing precomputed
volume data structures in the context are destroyed.
STATE VARIABLES
The current voxel array parameters can be retrieved with the following
state variable codes (see vpGeti(3)): VP_VOXEL_DATA, VP_VOXEL_DATA_SIZE,
VP_VOXEL_XSTRIDE, VP_VOXEL_YSTRIDE, VP_VOXEL_ZSTRIDE.