[LDCad] Part Snapping missing/errors

[Philippe Hurbain]

I have problems with part-snapping of roller coaster tracks on top of other parts, i.e. 25061 (90 degree), 26561 (ramp), 34738 (S-shape), 26599 (S-shape lower)... They snap perfectly "under" another part, but not on top of it - so I let them snap below and move 2 plates (16 LDU) upwards. I don't know if this is my fault or if the parts are missing snapping info.

This is the symptom of no snapping at all. It works from top because the part inherits connectivity of studs, but there is no common structure on plate bottom to allow subparting and inheritance.