vol.hull: Retain only the outer hull voxels of the foreground.
In dfsp-spirit/nitools: Managing and Visualizing Brain Surface Data
View source: R/vis_volume_3d.R
vol.hull R Documentation
Retain only the outer hull voxels of the foreground.
Description
Filters the *foreground* voxel in the volume by keeping only an outer border of voxels, and setting the inner core voxels to 'NA'. This is a utility function for voxel-based visualization. The goal is to remove the inner voxels, which will not be visible anyways, and thus to dramatically reduce the number of triangles that will need to be computed for the mesh.
Usage
vol.hull(volume, thickness = 1L, axes = c(2L))
Arguments
volume
numeric 3d array, must contain foreground voxel and background voxels. The latter must have value 'NA'. This function assumes that a solid foreground object surrounded by background exists in the volume.
thickness
integer, the width of the border in voxels, i.e., how many of the voxels in each upright column to keep at the top and at the bottom.
axes
integer vector, the axes to use. Valid values in the vector are 1L, 2L and 3L. You will have to use all 3 axes if you do not want any holes in the object. (Obvisouly, having noise around the object can still lead to holes.)
Value
numeric 3d array, a filtered version of the input. It contains at least as many 'NA' voxels as the input. If the function had any effect, it contains a lot more 'NA' values. The other values and the volume dimensions are left unchanged.
dfsp-spirit/nitools documentation built on Jan. 26, 2024, 8:24 p.m.
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View source: R/vis_volume_3d.R
| vol.hull | R Documentation |
Retain only the outer hull voxels of the foreground.
Description
Filters the *foreground* voxel in the volume by keeping only an outer border of voxels, and setting the inner core voxels to 'NA'. This is a utility function for voxel-based visualization. The goal is to remove the inner voxels, which will not be visible anyways, and thus to dramatically reduce the number of triangles that will need to be computed for the mesh.
Usage
vol.hull(volume, thickness = 1L, axes = c(2L))
Arguments
volume |
numeric 3d array, must contain foreground voxel and background voxels. The latter must have value 'NA'. This function assumes that a solid foreground object surrounded by background exists in the volume. |
thickness |
integer, the width of the border in voxels, i.e., how many of the voxels in each upright column to keep at the top and at the bottom. |
axes |
integer vector, the axes to use. Valid values in the vector are 1L, 2L and 3L. You will have to use all 3 axes if you do not want any holes in the object. (Obvisouly, having noise around the object can still lead to holes.) |
Value
numeric 3d array, a filtered version of the input. It contains at least as many 'NA' voxels as the input. If the function had any effect, it contains a lot more 'NA' values. The other values and the volume dimensions are left unchanged.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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