hi all i was tring to do bump mapping by myself (based on lesson 22) and it was not working after a few hours of frustrating failures, i decided to edit lesson 22 code to look for the problem when i modified the code of the "loadtextures" function, to load png files, i found the problem... it seems that png format do not like bumping :S im using a library i dowloaded somewhere... its called pngLoad i dont know why is this... the resulting image i got, instead of the bumped image,is the "inverse" of the base image (yo can get it by editint the image on "ms paint" and inverting colors) any one have an idea of whats happenign? and how to solve it? thanks by the way, english is not my first language, so sorry if there any mistake

I think you should look into Dot3 Bump-mapping instead of the lesson 22... Lesson 22 use emboss bump mapping, which is very out-dated and ugly...
Take a look at nehe's article, there's one explaining Dot3 bump mapping !

edit: here it is http://nehe.gamedev.net/data/articles/article.asp?article=20 :)

i see...

i do not like the idea of being eaten by a dinosaur so...
im going to stop living in the prehistory and will take
your advice

im off to read, i hope i can return with good news

thanks a lot