Hi tomot, all you really have to do is install and use the v2 beta instead of the old v1 version which it looks like you are currently using.

You can get the v2 beta from here: http://moi3d.com/beta.htm

The v2 beta has a completely different lighting engine enabled on it by default which gives a lot more illumination in different directions onto the model and doesn't leave such dark areas as you would find in v1.

There are different options that you can control on it (like manually tune the brightness levels and tweak the look to have highlights or a metallic look or also switch between some different light setups), but you should not likely need to fiddle with them, just the standard defaults with the new lighting engine should solve your particular problem.

If you do want to tweak the options, check out this previous post that shows where they are in v2:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3348.3


Also check out here for some screenshots of the new v2 lighting system in action:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2843.1


That's just one of the many things that are improved in v2...

There's a list of all the new stuff in v2 gathered here:
http://kyticka.webzdarma.cz/3d/moi/doc/V2releasenotes.html


- Michael