Calculates a space-filling 3D isosurface around the tree ** intree**
with a threshold distance of

reducepatch (

Example 1:

>> hull_tree (sample2_tree, 5) ← 5 µm isodistance

Example 2:

same but in 2D

>> hull_tree (sample2_tree, 5, [], [], [], '-s -2d')

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