mlib_VolumeRayCast_General(3MLIB) mediaLib Library Functions mlib_VolumeRayCast_General(3MLIB)
NAME
mlib_VolumeRayCast_General, mlib_VolumeRayCast_General_Parallel_Nearest_U8_Bit, mlib_VolumeRayCast_General_Parallel_Nearest_U8_U8,
mlib_VolumeRayCast_General_Parallel_Nearest_S16_S16, mlib_VolumeRayCast_General_Parallel_Trilinear_U8_U8, mlib_VolumeRayCast_General_Paral-
lel_Trilinear_S16_S16, mlib_VolumeRayCast_General_Divergent_Nearest_U8_Bit, mlib_VolumeRayCast_General_Divergent_Nearest_U8_U8, mlib_Vol-
umeRayCast_General_Divergent_Nearest_S16_S16, mlib_VolumeRayCast_General_Divergent_Trilinear_U8_U8, mlib_VolumeRayCast_General_Diver-
gent_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_General_Parallel_Nearest_U8_Bit(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Parallel_Nearest_U8_U8(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Parallel_Nearest_S16_S16(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Parallel_Trilinear_U8_U8(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Parallel_Trilinear_S16_S16(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Divergent_Nearest_U8_Bit(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Divergent_Nearest_U8_U8(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Divergent_Nearest_S16_S16(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Divergent_Trilinear_U8_U8(mlib_rays *rays, const mlib_genvolume *vol, void *buffer);
mlib_status mlib_VolumeRayCast_General_Divergent_Trilinear_S16_S16(mlib_rays *rays, const mlib_genvolume *vol, 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:
Please see the online man page on docs.sun.com or a print copy for the diagram.
Figure that represents the trilinear 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.
vol Volume data that consists of slices.
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 |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
mlib_VolumeRayCast_Blocked(3MLIB), attributes(5)
SunOS 5.10 10 Nov 2004 mlib_VolumeRayCast_General(3MLIB)