ZBrushCentral

Dynamesh - Cut out specific shape?

ZBrush Usage Questions
#1

Tying to create a hard surface cut in dynamesh with a specific shape. Created a polygroup the exact shape to be “cut-out”, but after re-dynamesh, it fills back in.


  1. Polygroup by mask + Polish
  2. Hide Polygroup> Delete Hidden
  3. Re-Dynamesh

What is a better way to do this? I already have an OBJ the exact shape and size, I just need to cut out exact shapes from it.

Attachments

dynameshCut.gif

#2

Looks like “Creating a “Picatinny” rail Part 1 & 2” will show good solution.

#3

when filling in holes, dynamesh doesnt do the best job. if you want exact holes Id reccomend using subtractive shapes to cut out sections with dynamesh. alternativly you could let it fill in then use clip or trim curve brushes.

subtractive dynamesh example: https://www.youtube.com/watch?v=BZ7x_n20nrM

#4

I’ve found that sometimes, it’s better to just Boolean shapes out, rather than clip them.
The way Dynamesh fills the area back in can be quite annoying. :slight_smile:
However, it seems that areas sometimes fill in again when Dynameshing,
even after using Boolean operations.

#5

You all forgot to mention powerful “CurveBridge” Brush

Method 1 - without Bolean operations and Dynamesh


  1. Mask with Lasso( then “Group Masked” we need it for step 7.
  2. Clear part of the mask as on picture
  3. Invert mask
  4. Hide unmasked “HidePT” -> Del Hidden
  5. Take “CurveBridge” brush right click near to the edge of the hole then press Shift (if nothing happen then draw curve along the edge while holding shift or increase brush size) then go to other side of the hole and do the same.
  6. It’s how it should look after you draw curves from both sides it should automatically create bridge between two holes
  7. Because we have PolyGrouped masked area at the beginning in step 1. we can now just hide green Polygroup and delete it.
  8. Colse holes (Geometry -> Modify Topology -> Close Holes) or Dynamesh
  9. Job Done

Curve Bridge Brush.jpg

Method 2 - with Dynamesh for Bolean operation


  1. Duplicate your Cube and hide one of them then Mask with Lasso shape you want extract
  2. Clear part of the mask as on picture
  3. Hide unmasked and delete hidden Take “CurveBrush” left click near to the edge and press shift (if nothing happen then draw curve along the edge while holding shift or increase brush size) go to second part and do that same (left click + Shift)
  4. It’s how should look result after properly used CurveBridge Brush on both sides
  5. Dynamesh then Extrude or move flat parts of the mesh so they come out from our main cube as on picture 6.
  6. Un hide the main Cube that we have hide at point 1. then move it to the top of the subtool pallet. Our negative subtool mark with the middle circles so it become negative in bolean operation.
  7. When u have all set as on picture merge down and Dynamesh
  8. Job Done

BOLEAN.png

HTH,
_
Piosio

Attachments

BOLEAN-V2.png

#6

Great workflow! The “Creating a “Picatinny” rail Part 1 & 2” answered my question, but I am definitely going to try this!