transparent lines

[wohltat]

according to the FreeCAD documentation there is currently no support for transparent lines.
https://wiki.freecadweb.org/Std_SetAppearance

Is this maybe "easily" possible now after the changes to the renderer?
This would be a nice addition for things like the Optics Workbench (https://github.com/chbergmann/OpticsWorkbench).
This is not really important but if it is just like "flipping a switch"/ setting some flags then it might be worth it.

---

OS: Linux Mint 20.1 (XFCE/xfce)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 2021.717.24301 +3842 (Git) AppImage
Build type: Release
Branch: LinkDaily
Hash: 44be6d539871be4083e83f428e8fcfbcf38408ef
Python version: 3.9.6
Qt version: 5.12.9
Coin version: 4.0.1
OCC version: 7.5.2
Locale: English/United States (en_US)

[wohltat]

Transparent lines already work. Can be set under View -> Line Material -> Transparency. Although it is more an Opacity because 0 is transparent and 255 is fully opaque. A 0 - 100 percentage transparency would be more consistent, but so far i'm pretty happy that it is possible.

The "Ctrl + D" (Display Properties) "Line Transparency" is not yet connected though. Shouldn't be too difficult i guess.

The result could look like that. Thanks to the OpticsWorkbench.

[wohltat]

I just noticed that the the Line Color is not used. Transparency works but its always a transparent yellow line, that looks white if it is very transparent.