BoundingBox (Point, PointSet) warping can result in None

[AhmetNSimsek]

as of d35e49b

import siibra
tpl = siibra.get_template('bigbrain')
tpl.boundingbox.warp('mni152') is None

Why: The spatial backend refuses to warp points outside the borders of their diffeomorphic transformation fields.

Extremal points of bounding boxes are outside quite often. So for the BigBrain’s own bounding box, but also for 1 micron sections. Reproduced by querying 1-micron sections with a bounding box in MNI space. Siibra warps the bounding boxes of the sections to MNI space but obtains no result.

Ideally, the backend would provide an endpoint for testing if points are outside the “brain” in the reference space. but it doesn’t so far.