3dsmax Invert UV's

PeterK

By inverted I mean "inside out"; not mirroring, or flipping.

I've been trying to find a solution for this problem, and it seems that there's nothing in max for it. Maya has some tools that invert UV's though, but that's not an option here.

In frame one, I open the Uv editor and I click on "select inverted polys", frame two shows the inverted polygons, and frame three shows that the faces themselves are not inverted, just the UV's.

I found a post by Mark, but the script doesn't perform as expected: http://www.polycount.com/forum/showpost.php?p=1511673&postcount=6

Additionally, unify normals/flipped normals does not fix this problem. One interesting fact is that these kids of faces invert properly when you use "relax" on them, they turn inside-out and turn the right way, but for models where you don't want to relax the UV's, this causes issues. Lastly, it's not always entire shells that are inverted, sometimes it's lone faces in a larger shell, so relaxing is again, not an option here.

petemc

With your inverted UVs selected, in the UVW editor go to tools -> Flip Horizontal and then Mirror Horizontal to align em where they were before. To check if this has worked go to Select ->Select Inverted polygons again, repeat the process if necessary

PeterK

Hi petemc, That had no effect at all.

petemc

That's odd, flipping the shells should invert them (or fix them if they are already inverted) and mirroring just fits them back into position. Are you sure there is nothing off about your mesh? Did you reset xform before you added the UVW unwrap modifier?

PeterK

Hi ,

I've reset xforms, did the box trick, exported to other formats and re-imported, I've flipped/unified normals with an editable mesh modifier under it, I've tried kidnapping it's kids and sending a ransom note; still no luck.

I wonder if these needs a script based solution.

petemc

Do all of your UV shells have unique space in your UV layout? Or are you sharing texture space? If you are sharing space, as per my first reply, select the inverted faces, right click and choose "Break", then flip horizontally, then mirror. After that I think a script could be the way to go

PeterK

Solution found by my man Darko: http://crash-3d.com/

1) add a new poly modifier and flip all the polies that are inverted on the uvs
2) add a new uvw unwrap
3) then add a second edit poly
4) flip the poly's back to normal on the model
5) and drag the unwrap uvw on top of the stack

petemc

Awesome!

moarbidcan

Is there a way to choose inverted uv faces? i've tried to select results from xview menu but it didn't choose anything.

Eric Chadwick

moarbidcan said:

Is there a way to choose inverted uv faces? i've tried to select results from xview menu but it didn't choose anything.

In the Unwrap editor, the Select menu has a tool for this.
http://help.autodesk.com/view/3DSMAX/2017/ENU/?guid=GUID-2AEF6A44-859D-434E-8E08-00D2A480A0CD

rampally

PeterK said:

Solution found by my man Darko: http://crash-3d.com/

1) add a new poly modifier and flip all the polies that are inverted on the uvs
2) add a new uvw unwrap
3) then add a second edit poly
4) flip the poly's back to normal on the model
5) and drag the unwrap uvw on top of the stack

 This method is not working for me can anyone  help me, please