while searching the web, I’ve seen lots of times some sites
trying to sell greyscale versions of textures as corresponding
As far as I understand it, a bumpmap is a completely different
information, otherwise it wouldn’t be neccessary to set up
a separate image file. (And a dark spot in the texture does
not neccessarily correspond to a dent).
Nevertheless I tried those “bumpmaps” and found that the
resulting renders look much better than when not using those
Now my question: Is this common practice to use such
“bumpmaps”? After all, maybe I’m wrong and either
the supplied images are not just the greyscale ones,
or there is some explanation why it looks better?