ZBrushCentral

Issues with Xtractor brushes

ZBrush Usage Questions
#1

With one of the base meshes, subdivided and sculpted, I tried to extract details with the xtractor brush (pattern on the left)
The Xtractor brush gives an alpha with artefacts that seams to match the 1rst subdivision level edges (alpha applied with the xtractor brush on the right)
What’s wrong and how to fix that ?
image

Moreover, i also tried to extract details from a scan of the top of a hand (not a full hand. This is not a bug caused by the xtractor brush thatt is larger than the scanned model thickness.
I got artefact lines.
image

#2

Hi @rimasson

I’m as much of an expert on these new tools as you are at this point, but I’ll share what Ive learned about them so far.

  1. The documentation is fairly extensive, so be sure to read all of that.

  2. You can get rid of a lot of the distortion around the target detail area by disabling the “Roll” function of the brush in the Stroke> Modifiers Menu. This will improve your results but also change the character of the brush, so YMMV.

  3. The brushes use the Alpha > From Brush function. You can activate that function and increase the resolution (width) of the captured alpha to increase the resolution. Higher resolutions will be more performance intensive, so proceed slowly.

#3

I’m experiencing the same issue. The XTractor Brushes appear to be capturing strange artifacts.

I’ve attached an image, which illustrates my woes.

ZB_2020_XTractor_Brush_002

#4

Please post a Support ticket showing this issue and including your settings for the brush. Thanks!

Xtractor brush - option to use non history
#5

Thanks Aurick! My ticket is: #SAO-549-44344

#6

@rimasson

In your first image. The issue is the brush is seeing all of your undo history which the very first undo is on a mesh that is low polygon. So the brush is seeing that state of the model.

If you use the CTRL + click on the undo state you want to capture from that should solve what you encountered.

The second image looks to be when the capture was done. It looks like you have an opening on the mesh. Is that a corner of the eye? If there is no mesh to capture when you are picking up, this could be the cause for what you have going on in the second image.

Could you share this model in a support ticket so we can verify.

@Ed_Ferrari

Your image looks like you captured on a very thin piece of geometry that didn’t have much thickness. Is that the case?

I’ll be communicating with you in your support ticket as well.

#7

@PixoPaul

You hit the nail on the head. I was using the XTractor Brushes on a plane/grid. I didn’t know that the supporting mesh had to have thickness.

Thanks for the response Paul!

EDIT:
As soon as I thickened my plane, the XTractor Brushes worked as expected! Awesome!