, mlib_VolumeRayCast_Blocked_Parallel_Nearest_U8_U8

, mlib_VolumeRayCast_Blocked_Parallel_Nearest_S16_S16

, mlib_VolumeRayCast_Blocked_Parallel_Trilinear_U8_U8

, mlib_VolumeRayCast_Blocked_Parallel_Trilinear_S16_S16

, mlib_VolumeRayCast_Blocked_Divergent_Nearest_U8_U8

, mlib_VolumeRayCast_Blocked_Divergent_Nearest_S16_S16

, mlib_VolumeRayCast_Blocked_Divergent_Trilinear_U8_U8

, mlib_VolumeRayCast_Blocked_Divergent_Trilinear_S16_S16

- cast a ray (or rays) through a 3D data set

Synopsis

cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>

mlib_status mlib_VolumeRayCast_Blocked_Parallel_Nearest_U8_U8
     (mlib_rays *rays, const mlib_blkvolume *blk, void *buffer);

mlib_status mlib_VolumeRayCast_Blocked_Parallel_Nearest_S16_S16
     (mlib_rays *rays, const mlib_blkvolume *blk, void *buffer);

mlib_status mlib_VolumeRayCast_Blocked_Parallel_Trilinear_U8_U8
     (mlib_rays *rays, const mlib_blkvolume *blk, void *buffer);

mlib_status mlib_VolumeRayCast_Blocked_Parallel_Trilinear_S16_S16
     (mlib_rays *rays  const mlib_blkvolume *blk, void *buffer);

mlib_status mlib_VolumeRayCast_Blocked_Divergent_Nearest_U8_U8
     (mlib_rays *rays, const mlib_blkvolume *blk, void *buffer);

mlib_status mlib_VolumeRayCast_Blocked_Divergent_Nearest_S16_S16
     (mlib_rays *rays, const mlib_blkvolume *blk, void *buffer);

mlib_status mlib_VolumeRayCast_Blocked_Divergent_Trilinear_U8_U8
     (mlib_rays *rays, const mlib_blkvolume *blk, void *buffer);

mlib_status mlib_VolumeRayCast_Blocked_Divergent_Trilinear_S16_S16
     (mlib_rays *rays, const mlib_blkvolume *blk, void *buffer);

Description

Each of these functions casts a ray (or rays) through a three-dimensional (3D) data set, then computes and returns the interpolated samples at each step along the way.

In trilinear interpolation, the value at point P is computed from its eight surrounding neighbors based on the equation below.

P = (1-a)*(1-b)*(1-c)*P0 +
    a*(1-b)*(1-c)*Px + (1-a)*b*(1-c)*Py + (1-a)*(1-b)*c*Pz +
    a*b*(1-c)*Pxy + a*(1-b)*c*Pxz + (1-a)*b*c*Pyz +
    a*b*c*Pxyz

where a, b, and c are the fractional parts of the coordinates of point P.

The trilinear interpolation is represented by the following figure:

In nearest neighbor operation, the sample value at point P is replaced by the value of the nearest neighbor voxel.

Parameters

Each of the functions takes the following arguments:

rays

Casting rays.

blk

Volume data in the blocked format.

buffer

Working buffer.

Return Values

Each of the functions returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

mlib_VolumeRayCast_General(3MLIB), attributes(5)