vol.sample.trilinear: 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 trilinear interpolation.

Description

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

Usage

vol.sample.trilinear(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 (column, row, slice). Coordinates must be within the volume, or an error will be raised.

Value

numeric vector, one interpolated value per query point.

Note

Coordinates which are exactly on the last voxel result in the value of that voxel: the interpolation weights of the out-of-range upper neighbors become 0, and their index is clamped (which is safe because their weight is 0).

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