Symmetry problem

#1

Hi all,

I seem to be having a glitch with symmetry. As you can see from the attached image of polygon selections, the symmetry is not working with the two rows of polygons closest to the centre. Same problem applies with vertex and edges.

This is a mirrored object, so both halves are identical, perfectly centred on the X axis. What could my problem possibly be? Is anyone else experiencing this? Is it something I’m doing wrong, or is it just a bug maybe?

symmetry problem

Thanks in advance for any assistance.

aw

PS. Not being a veteran poster yet, I’m not permitted to post attachments here so I have to resort to a url link. Is it possible to post images linked from an external site instead? Standard [image] tags don’t seem to work.

#2

currently symmetry in general is buggy, so ur problem is part of symmetry bug

#3

Hi Kursad, thanks for letting me know.

I was spending a lot of time re-mirroring and re-centering and checking point welds etc. I’ll just do all the modelling on one half first before mirroring now. Knowing it’s it’s a bug and not just me will save me a lot of time and stress now! :slight_smile:

aw

#4

Hopefully this gets addressed soon. This glitch effectively renders symmetry useless, making all the work put into it since the even worse LW version almost pointless. If this does get fixed, Modo will most definitely have one of the best symmetry tools around (currently Zbrush and wings3d rank highest on my list of “best symmetry tools”). Everything else requires hacks like clone/-1 scale, etc.

#5

I’ve read many complaints about LW’s symmetry tool, and I’ve been using it from day one, with LW 7.0 too. Yet I don’t see anything wrong with it. It does what’s expected and the only time it has failed me is if I go overboard on spin quads. Other than that I think the LW symmetry is great. If Modo is anything like it I’ll be happy, but judging from this and another thread I’m just not sure.

#6

If you liked LW’s symmetry, Modo’s is even better, however, it’s still ‘broken’. If you’re going to add a tool to your product lineup, you want it to work as well, if not better than competitors, no? Considering that a free modeler such as wings has a better implementation of symmetry than any high end modeling app, including LW or Modo, I’d say that this is an issue. Especially for those who paid good money for the software. I found it really hard to put up with symmetry in LW after using better versions in other software.

Aside from that, LW only does symmetry on one axis, with the added disadvantage of an inverted coordinate system while trying to edit the symmetry side. Modo addresses this issue so that editing either side of the symmetry axis is painless. I’ve had the LW version flake out on me for even simple edits, and I don’t even bother trying to use it while doing endomorphs anymore, despite the fact that I never have to alter the vertex order in my meshes, and it STILL breaks my symmetry? There are just too many tools in LW that will break your symmetry. Modo doesn’t seem to like it when you start changing the vert order by cutting or extruding/beveling either - probably inherited this flaw from LW. It’s pretty easy to break symmetry this way, but otherwise I’d say it works better than LW.

#7

Gwot,

I think this is what could be considered “artisticly disagree” or “artistic difference” whichever phrase. I couldn’t really wrap my mind around the workflow in Wings. I learned box modeling using smooth shifts from a video and feel most comfortable with that. So far, symmetry hasn’t broken on me after many smooth shifts, spin quads, merge polys, and bandsaw. Those are my primary tools of editing and it’s all been good. In other 3D programs, to get a similar symmetry effect like in LW I just select symmetric pairs of vertices and scale them to move them closer/farther (one scales positively, the other would get the equivalent of scaling -1, mirrored).

I really really wish there was a demo of Modo (or I live near someone who has it) because if I like the way it feels I’d definitely buy it. Modo + $500 XSI Foundation… hmm…

#8

Model without a center line? Symm works best in those circumstances.

#9

That’s exactly how I like to model my human head figures.

#10

Just a little fix I found for broken symmetry when you are unable to get it back. I’ve had this happen recenly on a character I was working with and loading the model into LW then saving back out seemed to work. I had also mirrored the geometry in LW to quickly test that symmetry at least worked in LW and it did. Works fine in modo again.

#11

i also delete the symetry line, what seems to fix the problem.

#12

Hey, thanks Gwot. Taking it into LW, re-mirroring and saving it back out again makes it work again in Modo!

And thanks for everyone’s helpful suggestions of modelling without a centre line, but doesn’t that always require an extra step of having to bridge the two halves each time you mirror it? A lot of times I actually forget to turn symmetry on and if am happy with what I’ve done on the half I was working on, I just delete the other half and mirror.

#13

Hi all,

have a few “problems” with symmetry.

I tried with and without center line. Really strange behaviors. For example, if i turn symmetry on and move a vert on the positive x side, the manipulator appears on the other side. doing it again, the manipulator appears on the vert it should be.
if i move the vert, the other side sometimes moves too, sometimes not. sometimes a “ghost” vert is moved. really strange. or i get overlapping edges if i use edge slice.

maybe just a display error? (i attached an image with a strange behavior. symmetry on, no center line. use of edge slice tool.)

I work on a laptop. Radeon Mobility 9000 with omega drivers. Everything else is working just fine in modo. :slight_smile:

#14

ok, i “solved” the “problem”. at least i have only the same small bugs like the others. G

I was just too stupid. To model a head i always start the same. Create a cube and then subdive it. Then extrude the neck and so on… I subdivided the cube with “D” - SDS Subdivide. After i did that the strange behaviors started. (i don´t know why i didn´t notice that faster)

Well, if i apply a freeze after i subdivide i can work in symmetry mode. Small problems (like the manipulator appears on the other side … ) still BUT that is not really bad.

Greetings

Martin

#15

I have some problems with symetry too, but the first thing I look is make sure I put my object at the origin (x, y and z) at 0 (zero). After, it appears to work well…

#16

for me it works now too. But still, sometimes i loose the symmetry. And it is strange that the manipulator appears sometimes on the left and sometimes on the right side. i don´t know why and i can´t reproduce it. just random… strange. :slight_smile:

#17

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