Thanks! I may implement height map editing tools but only when HeelX shows me how to save hmp files! Yes, a round preview area is planned and yes, it's a decal. There's a GameStudio (?) bug, though, sometimes the decal is rotated by 45° and I don't know why.
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual