Just fyi, and I've run into this across multiple distros, if you are running on gnu/linux, you might have to use the "SweetHome3D-Java3D-1_5_2" launch script instead of the standard launch script if you get an error about your 3d renderer.

I used to use it but since I have moved on to gltf 2.0 and it hasn't implemented that yet (only export to obj) I have focused on blender instead.