vol.sample.nearest: Sample a 3D volume at the given voxel coordinates using...

In fsbrain: Managing and Visualizing Brain Surface Data

Sample a 3D volume at the given voxel coordinates using nearest neighbor interpolation.

Description

Sample a 3D volume at the given voxel coordinates using nearest neighbor interpolation.

Usage

vol.sample.nearest(volume_data, coords)

Arguments

volume_data	numeric 3D array, the volume data.
coords	numeric matrix with 3 columns and one row per query point, the 0-based voxel coordinates. Coordinates must be within the volume.

Value

numeric vector, one value per query point.

Note

A coordinate which is exactly between two voxels is resolved towards the larger voxel index, i.e., floor(coord + 0.5) is used. This matches the behavior of scipy.ndimage.map_coordinates(..., order = 0). Note that R's round uses banker's rounding and would give different results for such coordinates.

fsbrain documentation built on Sept. 27, 2026, 1:07 a.m.