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Wierd InsertSphere Dynameh Subtraction Behavior in Z4R2b

ZBrush Usage Questions
#1

I just found a possible bug:

  1. Run Zbrush 4R2b
    2.Open DefautDynaWax64.ZPR (This step is important, must open this project or the result will differ)
    3.Select InsertSphere brush
    4.Turn on Radial Symmetry (This step is also important, must turn it on)
    5.Hold down Alt, click and drag on the Ztool
  2. Now, redyna the mesh, and my result is the newly added spheres being subtract by the old sphere, instead of the old sphere being subtract by the new spheres.

I hope the steps help pinpoint what caused the bug to happen.