Mirror Geometry -> drives me crazy

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Old 02 February 2013   #1
Mirror Geometry -> drives me crazy

Hi all
whenever I use the mirror geometry tool, or the duplicate special tool, I systematically run into the same problem: one half of my geometry is in some sort of shadow



All my normals are OK, and I selected all the vertices along the seam and merged them together, to no avail.

I've tried with both the duplicate special tool, and with the mirror geometry tool (trying out all the possible combinations in the options)

The worst thing about this is that sometimes it works, sometimes it doesn't.

So besides merging vertices (I tried with the highest possible threshold that wouldn't merge unwanted vertices), and verifying that my normals are as they should be, what else can I do to consistently avoid this issue that is really driving me crazy
 
Old 02 February 2013   #2
very strange.. still though, seems like a normals issue.

can you turn on display > polygons > face normals and they show as correct?
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Old 02 February 2013   #3
This is what normals look like after mirroring (with merge vertices option on)



I can consistently reproduce this (maya 2013):
Create a Polygon sphere at center
delete half the faces
mirror the other half

manually merging the vertices doesn't solve this issue
 
Old 02 February 2013   #4
If you display vertex normals instead of face normals, you will notice that the normals along the seam are 'forked'. Select the object and choose Nomals - Set Normal Angle, set to defaults and apply.

I may be wrong, but I think face normals just show the normal direction and not the smoothing angles of the face.

Oh, to get a better idea of whats going on with vertex normals selected, choose Vertex Face from the right click menu.

I hate normals, just saying.

Last edited by fleabay : 02 February 2013 at 12:29 PM.
 
Old 02 February 2013   #5
Quote:
Originally Posted by fleabay
If you display vertex normals instead of face normals, you will notice that the normals along the seam are 'forked'. Select the object and choose Nomals - Set Normal Angle, set to defaults and apply.

I may be wrong, but I think face normals just show the normal direction and not the smoothing angles of the face.

Oh, to get a better idea of whats going on with vertex normals selected, choose Vertex Face from the right click menu.

I hate normals, just saying.


This was exactly it

thanks for making my life a bit better in the future :-)

I guess I should read more about normals to understand what they are and what they do. There's just so much to know when you're a noob like me :-) That's what makes it exciting I guess
 
Old 02 February 2013   #6
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