mlib_VolumeRayCast_BlockedmediaLib Library Fumlib_VolumeRayCast_Blocked(3MLIB)NAME
mlib_VolumeRayCast_Blocked, mlib_VolumeRayCast_Blocked_Parallel_Near‐
est_U8_U8, mlib_VolumeRayCast_Blocked_Parallel_Nearest_S16_S16,
mlib_VolumeRayCast_Blocked_Parallel_Trilinear_U8_U8, mlib_VolumeRay‐
Cast_Blocked_Parallel_Trilinear_S16_S16, mlib_VolumeRay‐
Cast_Blocked_Divergent_Nearest_U8_U8, mlib_VolumeRayCast_Blocked_Diver‐
gent_Nearest_S16_S16, mlib_VolumeRayCast_Blocked_Divergent_Trilin‐
ear_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-dimen‐
sional (3D) data set, then computes and returns the interpolated sam‐
ples 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:
Printed copy or docs.sun.com displays a figure that represents the tri‐
linear interpolation.
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:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOmlib_VolumeRayCast_General(3MLIB), attributes(5)SunOS 5.10 2 Mar 2007 mlib_VolumeRayCast_Blocked(3MLIB)
