I'd just like to add that I used SH3d a number of years ago on a different project with great success. I appreciate the effort all y'all have put into this, and I'm confident that we can make it work!

Following up, I've tried the following - it seems to work exactly the same in all cases.
- 6.3 download, stock
- 6.3 modified as shown above
- Ubuntu distribution version
- 'Portable' all architecture version
I also tried to get the Java Web Start version working with suggested parameter mod ...

I did that first, and the app came up but it was not in hidpi mode, very tiny. That's why I tried modifying the script as shown above, after I tried all the things I found online. I'm open to suggestion

Folks,
It appears to me that the mvnForum.com domain has been parked. All the links on this forum's "Help" link at the top are broken in different ways. [:((]

Folks,
I'm running an HP x360, Ubuntu 18.04. I'm trying to get SH3D running in HiDPI mode. I've tried the various suggestions I've seen, so far without any success - the program runs but it's all tiny. My most recent method was to edit the SweetHome3D shell script to run my local copy of java 13 ...