[LDCad] Part Snapping missing/errors

[Philippe Hurbain]

Not really a shadow problem, but the stud of the telescope (64644) is next to impossible to insert into tube of plate 1x1 round (6141). Most of the time, the telescope jumps to connect its tube to plate stud. Moving the plate instead doesn't help. It works much better with a regular plate 1x1 (3024)!