@Zoitter hmm can you get your duke-rt.log file and share? i think there's a github issue on the repo already. you should be able to append it there. appreciate you trying it out and coming back with feedback!
For those who are just discovering the project, Duke-RT is the product of around four months of work so far. I played the absolute hell out of Duke 3D back in the 90's and wanted to take a crack at building the coolest way to enjoy it on a modern PC.
Wanted to get volumetric smoke in for this Duke-RT release but it needs more time to cook. I haven't done any of the fluid dynamics work or visual niceties yet, but I have the three different lighting methods affecting smoke voxels and it's starting to look interesting.
Luckily, I've had some incredibly kind and helpful people trying things out as I've worked, submitting issues on GitHub, and giving feedback. I can't thank them enough!
I hope a ton of people get to enjoy Duke 3D in a modern way!