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When I pointed it to luxcoreui , I couldn't save my renders in a .png format.

I gave it a try and it seems that LuxCoreUI crashes for some reason when selecting "Save Outputs" command after it was started from within FreeCAD.
As a workaround, you could export the raytracing project and then ...

After I installed the precompiled LuxCoreRender binaries, I found 4 binaries: luxcoreui , luxcoreconsole , luxcoredemo , luxcorescenedemo . But when I went to FreeCad, it asked for Luxrender binary. When I pointed it to luxcoreui , I couldn't save my renders in a .png format. Which binary do I link ...

Thanks for the tip!

But how do I run the precompiled binaries with OIDN (which I have installed)?

The scripts looks for libstdc++.a here: https://github.com/LuxCoreRender/LinuxCompile/blob/347853518d4003503e60717b8b54c66b087378ad/utils/prepare#L73

It supposed to be at /usr/lib/gcc/${ARCH}-linux-gnu/$GCCVER/libstdc++.a or /usr/lib/gcc/${ARCH}-linux-gnu/$GCCVERMAJOR/libstdc++.a

You can also ...

When I tried to install LuxCoreRender for FreeCAD (As I found out LuxRender was obsoleted) from the Git repository using the Linux Compile repo available, I ran into trouble regarding library file libstdc++.a

OS: Fedora 29 Workstation

Steps to reproduce:

$ cd ~
$ git clone https://github.com ...