… I think that I found the hint to the mirror plane normal.
DraftWB uses the mirror tool of PartWB.
But PartWB mirror only can use the system planes or offsets to them.
In DraftWB you can generate a "working plane proxy" on the "surface for mirror".
When using DraftWB mirror you only are able to select 2 points on a wire of the "surface to mirror".
And you get an oblique mirror of the Gordon surface.
But inserting/using the values of the normal-vector of the working-plane-proxy into datatab of the mirror,
the oblique position can be corrected.
(A bug or a feature?)
- DraftMirrorGordon_2.PNG (56.76 KiB) Viewed 1954 times