Smooth lines between meshes?

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  09 September 2009
Smooth lines between meshes?

Hey guys,

I'm encountering a problem while modelling something in Maya!
I created to polygons mesh That I combined and merged together. However, where the two meshes had been merged, I don't have a smooth line. How can I resolve that?

Thanks for your help!
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File Type: jpg Screen shot 2009-09-15 at 17.34.24.jpg (34.1 KB, 27 views)
File Type: jpg Screen shot 2009-09-15 at 17.34.52.jpg (51.9 KB, 29 views)
  09 September 2009
Not sure, but did you weld the vertices? I think just merging two meshes does not weld the vertices. Take a look if there are two vertices lying on top of each other.... Could also be an an hard edge in the sub-div I think... but I am not very familiar in modeling with mayas sub-divs....
  09 September 2009
I actually merged the vertices together.. So it's not that. What do you mean by an hard edge in the sub-div?

I got the same problem on an other part of my mesh. I merged the same way fingers to a hand. One finger is OK, the other one has the same weird edge.. :s
Attached Images
File Type: jpg Screen shot 2009-09-15 at 18.45.58.jpg (28.0 KB, 15 views)
File Type: jpg Screen shot 2009-09-15 at 18.47.57.jpg (57.6 KB, 13 views)
  09 September 2009
The issue are the Vertex Normals.

Edit Polygons -> Normals -> Soften/Harden

Edit: Oh...just saw that these are subdivided Meshes...look up 'crease'.

Last edited by Piflik : 09 September 2009 at 05:47 PM.
  09 September 2009
Thanks for your help Piflik,
But I don't see any difference after the soften operation :s
How I am supposed to do exactly? Sorry, I'm new to Maya and learning by myself.
  09 September 2009
Yeah sorry...I just realized that these are subdevided meshes...have a look at the 'crease' option and also check, if you possibly have two edgeloops on top of each other.
  09 September 2009
Hey merge the edges.
  09 September 2009
Nop, doesn't seem to be an edge loop problem. And the crease option?
Here's my .mb file if someone could have a look at it.. It would nice
  09 September 2009
I checked your file. The problem is in your model's FACE NORMALS.

The Normals(the direction of the faces) of the legs of your model are going in the direction outside the mesh(which is correct)
But the Normals of the rest of the body of your model are facing opposite direction, that is inside the mesh( wrong direction).
  1. select your model. press F8.
  2. go to Display- polygons-Face normals.
  3. Now your model would show normal lines on it(green lines)
  4. Hit F11
  5. select faces of rest of the body(excluding legs.its normals are perfect)
  6. go to Normals and hit Reverse.
  7. aaafter you have corrected all the normals of the body press F8
  8. go to Display -polygons- Face Normals.(to hide normal lines)
A geometry should always have Normals facing the same direction.

Last edited by sumeetkaur : 09 September 2009 at 12:57 AM.
  09 September 2009
Yeah, thats why I normally always model with Backface Cull ON. In Maya the standard display is without Backface Cull which leads to such issues. At least there could be a different color for the backfaces in Maya, so you could see which side is actually Front/Back...
  09 September 2009
Thanks sumeetkaur for your precise explanations, that really helped!
But I'm confused.. How did you know that the body faces normals were upside down? Why the body and not the legs?
Oh just.. I also tried to apply your method on the toe. It kind of worked, it's not as strong as it was, but I still have a weird line on it?
Attached Images
File Type: jpg Screen shot 2009-09-16 at 11.32.07.jpg (24.5 KB, 7 views)
  09 September 2009
You are welcome.

About your question that how did I know that Face Normals are not perfect. The answer is that when a problem like in your model exists, the first thing we have to do is check the Face Normals of the mesh (by going to Display-Polygons-Face Normals)

As I told you a models Face Normals should always be in same direction that is going outside the mesh(which in your case were correct only in the leg.the normals{green lines} of the rest of the body were going inside)

Even if you want to take your model to ZBrush first thing you have to do is check whether its Face Normals are perfect or not.

Well your new file in not opening in my machine.send it again.

check the vertices are merged properly at toe and try to merge the edges.

Last edited by sumeetkaur : 09 September 2009 at 05:11 PM.
  09 September 2009
I just cheked once more the face normals.. It's so dense! I see that some parts are still in the wrong way but can't say exactly which one.

For the toe, I had to delete a vertex to tide a bit the mess. It's better but not yet resolved.
If you look under the feet, where the two toes are diverging, there's still a vertex linked to another vertex outside of the foot. I don't know how to solve that..

Hope you will be able to help me on that
  09 September 2009
I dont know why, my winrar utility programme is unable to extract your file.
  09 September 2009
this is the error............

Last edited by sumeetkaur : 09 September 2009 at 11:08 AM.
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