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Question regarding smoothing groups
show user profile  alveus
Hey people

I have a questions regarding smoothing groups, just came across the following:

The faces on these two pictures have the same smoothing groups, although they look different.
My question is a bit tricky, how do you know when your smoothing groups are correct? Trained eye and Experience?

Later I changed all the smoothing groups to 28, and it all looked even, Is this the way it should look like? On the first picture the faces had the same smoothing groups too; I guess that was a bug then?


read 610 times
2/14/2012 1:46:42 AM (last edit: 2/14/2012 1:46:57 AM)
show user profile  Mr_Stabby
like.. wut? the smoothing group # has nothing to do with how it looks, if 2 faces with the same smoothing group are next to each other they appear as the same curved surface. If 2 faces are next to each other without a shared smoothing group they appear to have an edge between them. There are multiple smoothing groups for situations where you might want to selectively have smooth or hard shading between certain faces or model sections. Most of the time you can just use auto smooth, everything under the specified angle will get put to the same group while if a face breaks the angle limit it gets a new group.

read 601 times
2/14/2012 2:07:41 AM (last edit: 2/14/2012 2:07:41 AM)
show user profile  alveus
ALright, I get what you're saying. I'm going to put it in a different way so forget my previous post.

The shape I'm working on is a cube like shape.My question is, on the left side of the object, why do I get dark faces at the bottom and on the side? They are all in the same smoothing group. How can it be possible that they share the same smoothing group yet look different. Note that ambient occlusion is off so I don't think is anything weird like that, what am I missing?

read 580 times
2/14/2012 3:31:33 PM (last edit: 2/14/2012 3:37:39 PM)
show user profile  Octopuzzy
It's because some of the faces on the backside of your object also
has its smoothing group number set to 1, so it tried to smooth that 90degree corner.

Smoothing groups won't make a 90 degree corner look good without support geometry.

Your way of working is borked up though...why would you mess with smoothing groups above a turbosmooth modifier?...Since you get shading problems above the turbosmooth modifier, it is more likely that it's a mesh error already at the base of the stack.

read 568 times
2/14/2012 3:47:26 PM (last edit: 2/14/2012 3:47:26 PM)
show user profile  Garp
A polygon can have many SGs. If two polys with a common edge have one or more SGs in common, they're smoothed together, as if making a continuous curvature. With no SG in common, it's a hard edge.

read 553 times
2/14/2012 5:01:48 PM (last edit: 2/14/2012 5:01:48 PM)
show user profile  alveus
Thanks guys, always very helpful.
read 540 times
2/14/2012 8:43:45 PM (last edit: 2/14/2012 8:43:45 PM)
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