This would properly be thought of as the voxel spacing when
voxels are assumed not to have a physical extent (only a location).

```
voxdims(x, ...)
# S3 method for im3d
voxdims(x, ...)
# S3 method for character
voxdims(x, ...)
# S3 method for default
voxdims(x, dims, ...)
```

## Arguments

- x
An `im3d`

object with associated voxel dimensions, a path to or a 2 x 3
BoundingBox `matrix`

.

- ...
Additional arguments for methods

- dims
The number of voxels in each dimension when x is a BoundingBox
matrix.

## Value

A numeric vector of length 3, NA when missing.

## Details

We follow Amira's convention of returning a voxel dimension equal to
the bounding box size (rather than 0) for any dimension with only 1 voxel.

## See also

`boundingbox`

Other im3d:
`as.im3d()`

,
`boundingbox()`

,
`im3d-coords`

,
`im3d-io`

,
`im3d()`

,
`imexpand.grid()`

,
`imslice()`

,
`is.im3d()`

,
`mask()`

,
`origin()`

,
`projection()`

,
`threshold()`

,
`unmask()`