Ooops - I guess I should read the manual occasionally... WELL,... there is a reason why I switched it, and it is known as the "great bumpmap desaster". As a matter of fact, the PC Poser creates damaged .bum files which won't work at all (the bug seems to affect most - if not all - PC versions since Poser3 days). Please follow these links for a detailled description: http://www.angelfire.com/art2/cheapskate/bumpmaps.html http://www.poserforum.net/ubb/ultimatebb.php?ubb=get_topic;f=5;t=004613 http://www.renderosity.com/messages.ez?Form.ShowMessage=454108 As a matter of fact, this bug does not affect the Mac version, but the .bum files created are definitely 1) black = mountain 2) white = hole You could see it either as a bug in the manual description, or a different bug in the Mac Poser. If you "repair" .bum files the way how it is described in the original thread you will end up with identical (and working) files on Mac/PC, so I guess it is better to regard the manual as buggy (especially because no one seems to read it anyway... :-)