Zbrush Mechanical Part 4, Rounded Holes

I needed a hexagonal part with a round hole in the middle.   This would seem to be a challenge for ZBrush requiring an outside modeler.   However, it is actually pretty easy in ZB if you know primitives and deformers.

First, we can start with our old friend the cylinder primitive:cyl1   

Not very hexagonal yet, and too long, but we can fix that.  We tweak the number of sides to 6 and shorten the z-length in the “initialize” menu:hex2

Better, but no hole . . . We can solve that by setting the “inner radius”:hexhole3

Nuts, close, but the inside whole isn’t round.   I’ll need to fix that up before the boss sees it.   I go ahead and make this a poly mesh and then group the inside polygons.  I also divide the polymesh a few times (well, 3 actually) with the “SMT” option off (so that it doesn’t round off my hexagonal prism).  Showing just the inside polygons (with display-double on for ease of viewing, I have:

holegroup4

Now if there was a easy way to round those off, I’d be home free.   Hey, what about that “deformations” subpallet?defmenu

Ooo . . . I like that “RFlatten” thing . . . (It’s short for Radial Flatten).   A little RFlatten and slight tweak of the size (with just X & Y turned on) and I have a nice round hole.  roundedhole5

Unhiding my geometry, I’m good to go:finishedhex

Total time to  model: less than two minutes.

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