CGTalk - normal maps issue

Tornado7

07-05-2010, 07:30 PM

Hi Guys! I've a very simple 8 sides cylinder and his hi-res version...as you can see in the next image his uv map is pretty standard and all the egdes (besides the border ones) are soft:

http://francesco-puccini.it/picture_01.jpg

as you can see in the next picture, the resulting normal map on the edge of the low-res cylinder looks quite weird (I checked the normals too, but they are ok):

http://francesco-puccini.it/picture_02.jpg

any explanation for this behaviour? thanks in advance for any help ;-)

Francesco

chafouin

07-05-2010, 10:33 PM

That's completely normal. When you render the normal map you use a cage from the low poly and send rays to calculate the orientation of the hi poly. Here you can see that you're low poly has not the same subdivisions as your high poly, so the cage is too different.

If you want to have a bevel on your low poly, just duplicate your low poly and bevel it, then use it as your high poly model to render the normal map.

Like this:http://www.wearedots.com/trash/normal_explanation.jpg

Tornado7

07-06-2010, 10:47 AM

ok, thanks a lot for your very useful reply ;-)

Francesco

CGTalk Moderation

07-06-2010, 10:47 AM

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.