My plan is getting complex and my graphic card is unable to cope. To speed things up I would like to put each level in a separate .sh3d file. This way I can work on each level faster.

The problem is then combining the different files into one to have a 3d look of the whole thing.

Copy and past in another file is not working in SH. Importing plans seems also be no option.

Anybody has some advice apart from buying a more powerful computer?

Michael