basic question: how to round up a box with a normamap in tangent space?

[aphexx]

hi i have a fundamental question concerning normalmaps

initially i had a problem, baking a wooden sculpted cupboard to lowpoly geometry.
everytime the normals just bend crazy around flat faces.
http://www.saschahenrichs.de/priv/boxprob/cupboard.jpghttp://www.saschahenrichs.de/priv/boxprob/cupboard2.jpg
so the essence of this question is, how can i bake round corners onto a low poly box in tangent space..
here in pictures:
http://www.saschahenrichs.de/priv/boxprob/box_question.jpg

[Wayne]

This is due to rays missing the corners, also a good reason why you shold add a bevel on edges such as that. Its a common problem that happens due to the way surface normal and the rays casted works in all apps.


Wyane...

[aphexx]

thank you wayne.
hoped to get around it without bevel.

btw. the 3dsmax baker handels it without a problem, as i now found out!
http://www.saschahenrichs.de/priv/boxprob/box_3dsmaxnormal.jpg