topic Re: non-planar faces Bug in Maya LT Forum

non-planar faces Bug

Anonymous — Thu, 31 Mar 2016 18:29:40 GMT

if i create a cube and scale one face. then do a clean up select i get non-planar faces. can anyone help me with this.

Re: non-planar faces Bug

Anonymous — Fri, 01 Apr 2016 16:54:00 GMT

Is this normal should i ignore it. Can someone help me please. It would be greatly appreciated.

Re: non-planar faces Bug

saihtam — Sat, 02 Apr 2016 22:02:51 GMT

That does not happen here, Maya 2015 (not LT). You do nothing else to the cube? Can you post a picture of what's happening?

Re: non-planar faces Bug

Anonymous — Sun, 03 Apr 2016 15:56:58 GMT

here are some screenshots of what i mean. i scale a face then do a clean up select and it selects some non-planer faces.

Re: non-planar faces Bug

Anonymous — Tue, 05 Apr 2016 16:33:44 GMT

can any one help im wasting money. i cant work till i fix this issue.

Re: non-planar faces Bug

Anonymous — Tue, 05 Apr 2016 17:05:39 GMT

i just tryed make a sphere and i did a clean up and i get non planers agian. can anyone please help me.

Re: non-planar faces Bug

Carlos_Carpintero — Tue, 05 Apr 2016 17:33:00 GMT

Hi blood_wolf_live,

I am not getting this issue either.

In the image you attached with the Cleanup options, you have 3 other options selected along with Non-planar faces. Why are you under the impression it's non-planar faces that are being selected?

That being said, it's a puzzle to me why anything at all is being selected since you are using a default cube.

Have you tried to reset your preferences? Also, in the Cleanup Options, in the Fix by Tesselation section, unclick everything except Non-planar faces to verify that it is indeed non-planar faces that are being selected. Delete the construction history and freeze the transformations on the cube just to eliminate other variables.

Regards,

Carlos

Re: non-planar faces Bug

Anonymous — Tue, 05 Apr 2016 17:48:24 GMT

Thank you for replaying. but i have tried all what you have said just know. but im still getting non planer. in clean up options i only checked no planer and i delete the construction history and freeze the transformations. im still getting non-planer faces. i have reset all preferences to default but nothing. i have even uninstalled and reinstalled but nothing is seems to fix it. hope you can help.

Re: non-planar faces Bug

Carlos_Carpintero — Tue, 05 Apr 2016 19:29:49 GMT

Ok, try the following please.

Create your cube and then enter the following command in the command line: setPolygonDisplaySettings("nonPlanar"); (you can also accomplish the same thing by going to Display>Polygons>Non-planar Faces)

This command toggles the display of non-planar faces to ON. I would like to know at what point the faces become non-planar. My feeling is that this is a display issue, but I can't be sure at the moment.

-Carlos

Re: non-planar faces Bug

Anonymous — Tue, 05 Apr 2016 20:58:34 GMT

ok i did as you said but nothing is highlighted. but i know the highlighting works because if i move one of the vert it highlights.

Re: non-planar faces Bug

Carlos_Carpintero — Wed, 06 Apr 2016 13:45:58 GMT

Moving one vertice will produce non-planar faces, this is normal. By definition, a non-planar face is a face that has more than three vertices, and one or more of those vertices does not lie in the same plane. (see https://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Maya/files/Polygons-overview-Planar-and-nonplanar-polygons-htm.html)

If you select a face on your cube and rotate it, this will also produce non-planar faces. Scaling a face should not produce any though as far as I know.

Can you tell me the version and build of Maya Lt you are using? Do the following commands to find out:

about -c;

about -iv;

Also, please send me your scene with the cube. If you can't attach it to this forum, you can send it directly to me at carlos.carpintero@autodesk.com.

Carlos

Re: non-planar faces Bug

Anonymous — Wed, 06 Apr 2016 16:02:13 GMT

ok here you go. hope you can help. could not attach it so i but it in a zip file.
201511271533-979388-1
Autodesk Maya LT 2016 Extension 2 SP4

Re: non-planar faces Bug

Carlos_Carpintero — Wed, 06 Apr 2016 17:45:54 GMT

I've opened your file and I don't see any non-planar faces. More and more I am thinking there is something going on with your particular system.

I noticed that there is something different in the Maya looks and feels when I open your file. The way the cube is drawn, along the edges we see black triangles. If I do Display>Polygons>Face Triangles, we see the dotted lines of the triangles from the rear faces.

The grid is different from the default grid, and if I go to Display>Grid Option box and press Apply, the grid shrinks down to it's original correct size.

Do you change the default Maya setup? Or, do you run any Script Nodes when you open a new scene?

Re: non-planar faces Bug

Anonymous — Wed, 06 Apr 2016 17:59:47 GMT

i did change the grid size when i was working on a large abject. but that's all that i changed. im not using any Script Nodes.

Re: non-planar faces Bug

Carlos_Carpintero — Fri, 08 Apr 2016 12:34:27 GMT

I hate to admit it, but I am stumped.

I've looked through our database of bugs and haven't found anything concerning non-planar faces appearing after scaling a face.

Some other ideas to try:

1. Reset everything to Maya's default, so grid size, or world size, camera settings, etc.

2. Update video drivers

The silver lining with all this I think is that non-planar faces are not necessarily bad. Non-planar faces can be smoothed, rendered and all the modelling tools should still work fine.

Non-manifold geometry is the thing you need to avoid since Maya's modelling tools will give unpredictable results. You can learn more here: https://knowledge.autodesk.com/support/maya-lt/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/MayaLT/files/Polygons-overview-Twomanifold-vs--nonmanifold-polygonal-geometry-htm.html

If I learn of anything new I'll update this thread. Or if you find the reason it's happening, please let us know.

Regards,

Carlos

Re: non-planar faces Bug

Anonymous — Fri, 08 Apr 2016 16:40:59 GMT

Thank you for all your help it seem ones i restored the grid size to its default settings it seems to have fixed the non-planer faces. know i can make a cube and scale a face i do a clean up and nothing is found. thank you for your time and helping me with this issue.

Re: non-planar faces Bug

Carlos_Carpintero — Fri, 08 Apr 2016 17:05:31 GMT

Excellent, I am really happy my suggestion helped you.

If you have time, can you please give the exact steps on how you set up your grid? There may be a bug there that hasn't been seen before.

If you don't have time, that is ok, I will try and repro your setup.

All the best,

Carlos

Re: non-planar faces Bug

ww2586732 — Fri, 23 Jan 2026 20:45:33 GMT

his is expected behavior. When you scale a single face of a cube, the surrounding faces often become non-planar because their vertices no longer lie on the same plane. The cleanup tool simply detects that geometry issue.

To avoid this, try moving vertices or edges instead of scaling the face, or use tools like Extrude or Inset so the surrounding faces remain planar. You can also manually flatten the affected faces after scaling.