ZBrushCentral

mirror and weld

ZBrush Usage Questions
#1

I am using zbrush 4.0 for OSX on a macbook pro.

I’m trying to mirror and weld in zbrush. I’m getting the error saying, “the resulting mesh does not contain any polygons” and then it cancels and does not allow me to proceed. Does anyone know what this is? I haven’t been able to find a direct reference to it yet.

#2

Did you play around with your axis settings? I’ve seen a similar message with the remesh all function and its usually because I didn’t set the x,y,z settings…those buttons are tiny!

#3

Same thing here. I played around with the settings, checked and unchecked the axis buttons, restarted ZBrush but it doesn’t mirror along the x- or z-axis.:cry:

#4

I think I see whats happening, if you move/offset an object to somewhere on the wrong side of the axis, as in you are canceling out your object I think.

Try this:


  • Make an object.
  • Make it PM3D.
  • Make sure Mirror and Weld are set to X but Y and Z are off.
  • Offset it in the DEFORMATION menu a noticeable amount to your LEFT. (-X)
  • Hit Mirror and Weld (X only).
Did you get an error? (I bet you did not.)

If so try offsetting to your RIGHT (+X) and try again making sure to cross the center of the canvas, NOW you SHOULD get an error.

Left (-X) is good, right (+X) is a black hole filled with icky goo and error messages with an unnatural number of eyes.

I hope that helps.

Cheers!
Mealea

#5

By the way, trying to figure this out led to something neat! So thank you VERY much for asking about it!

Normally when presented with options like XY or Z I will do the stupid thing and use all of the above. This is exactly what I did in this case before thinking about what was actually happening to you guys.
This also showed me what was happening to you.

This is fun:


  • Make an object.
  • PM3D the snot out of it. (Objects hate snot)
  • Set Mirror And Weld so that XY and Z are all ON.
  • Set Offset in the Deformation Pallet so XY and Z are all ON.
  • Move the Offset slider to the LEFT a bit.
  • Hit Mirror and weld.
  • Set Rotate in the Deformation Pallet so XY and Z are all ON.
  • Move the Rotate slider at random.
  • Hit Mirror and Weld.
  • Keep messing about with this.
  • Try other deformations!
  • Order Pizza and stay up too late.
Fun huh?
Offset to the left to make your object larger, to the right to shrink it but not too much or you will get that error.

#6

Thanks for your reply. So that “no polygons”-thing really is a bug!?

#7

No, not so much a bug as you telling Zbrush to literally make nothing out of something. If it gave no error message or just crashed THAT would maybe be a bug, but it does not, it gives you an error telling you that you are attempting to make a nonexistent object.

Did you try my suggestion in my first post? And if you did, did it work?

#8

Yes, your suggestion did work.
But if there is an axis, the mirrored geometry has to be on the other side, right? so the offset shouldn’t matter.
And maybe there would be geometry if zbrush wouldn’t prevent me from mirroring it.:wink:

again thanks for the quick help

#9

Make sure your floor button is pressed and visible. Using either the transform tools or deformation offset, position your mesh along the side of the axis where the color axis marker lies. If you have your mesh on the wrong side, zbrush doesn’t “see” it and you get the warning you received. If you get the warning again flip the mesh over and move it to the other side of the axis line and try again.