Function create_mip 

pub fn create_mip(
    data: &[f64],
    grid: &Grid,
    affine: &[f64; 16],
    window: usize,
) -> Result<Mip, String>

Minimum intensity projection along the z-axis.

For each (x, y) position, takes the minimum value over a sliding window of window slices along z. The result is window - 1 slices shorter than data and sits half a slab further along the slice direction, so it comes back as a Mip carrying its own grid and affine — see mip_geometry for the convention.

Arguments

• data - 3D volume (Fortran order)
• grid - Volume grid (dimensions and voxel sizes)
• affine - Row-major 4×4 voxel→world affine of data. Pass an identity affine if the caller has no world geometry; the projection’s affine is then identity-with-origin-shift.
• window - Number of slices in the projection window

Errors

If window is zero or deeper than the volume, or if data does not match grid.