Concave result of polybevel

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Why does the polybevel SOP make some edges concave, and how can I prevent it?

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stone_wall.hipnc (141.5 KB)
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For those who not already noticed, I am making a cobble wall, but the bevels do not really work out as they should. As you can see, the majority of the stones gets a nice round-ish shape, but there is also quite a number of stones that retain their sharp edges. These are precisely the ones that get concave edges. Is there something that I am doing wrong? Here is the houdini file again.

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Screenshot from 2019-01-16 14-17-32.png (187.3 KB)
stone_wall.hipnc (139.7 KB)

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Hi, Regarding your 2nd post,

Polybevel doesn't like overlaps and some of the incoming points are too close to each other for the bevel size. (if you decrease the bevel size, you'll see less broken areas)

You could use that fuse in a for-each loop instead and increase the fuse distance. This will keep the stones from fusing to each other and fix some of the very close points but the bevel will still only work up to where it overlaps.

A 3rd PolyExtrude with an inset might be an option too.

Or just ditch the Polybevel completely and use a subdivide instead. This would also allow you to use creases for the “roundness” of the stones.

If you are going to add displacement etc, it might be best to use subdivide anyway so you can avoid the ngons from polybevel.

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Stone_Wall_SD.jpg (96.9 KB)
Stone_Wall_PE.jpg (98.5 KB)
stone_wall_RS.hipnc (160.6 KB)

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Thank you. That explains a lot!
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