Hi,

unfortunately this is not possible. Therion doesn't calculate intersections of walls in the upper and lower level and PDF transparency feature is used to display lines below in grey.

Best regards
Martin

On Wed, Sep 24, 2025 at 6:23 PM Yann Gardère <gardere.yann@gmail.com> wrote:
Hello,!

Is there a way to customize the galleries below automatically generated with Therion using MetaPost?
When THconfig as the actif line

  "transparency on"
  "opacity 80 "

Such as example:

def l_wall_xxxxxxx (expr P) =
    pickup PenA;
    draw P withpen pencircle scaled 1.5 dotted ...
enddef;

I'd like the wall line below to be automatically generated as a dotted line, without having to define it with "underlying" in drawing mode

a.jpg

Thanks
Yann
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