[LDCad] shadow library / parts snapping questions

[Roland Melkert]

1. Grid with 6 parameters

The sequence is:
C x C z StepX stepZ
or
C x C y C z stepX stepY stepZ

The C's are optional indicating if the grid is centered on the corrisponging axis.
The documentation was written before the longer variant was added,

2. Default of SNAP_FGR.center

Both are true fgr is centered by default cyl not.

3. Matching of SNAP_GEN bounding shapes

They are matched on group, shape and size depending the match setting. if it is set to shape (def) it will match on group and shape, if it's on group just the groups needs to match.
The placement option is applied when possible.
Retain means it will snap in the current orientation of the dragged part.

4.SNAP_CYL.mirror.cor

If the option is set to cor and a mirrored matrix is detected during inheritance it will try to corrected this by flipping x or z.
Like you wrote this is invisible for cylinders but it prevents mirroring parts when they snap to it.