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3dome

Voronoi Fracture Issues

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Hi guys,

so I got this house model which I'm going to destroy. When it comes to voronoi fracturing (create inside surfaces turned on) I get strange chunks coming out of the walls.
I don't really know where it comes from (I guess it's the triangulation inside voronoi fracture) and I don't know how to fix it.
I tried converting the mesh into VDB and fracture that but even there are some chunks sticking out.

I attached the file.

Cheers

housefracture_to_odforce.hip

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Here is an approach I often take when fracturing. I will use a divide in Bricker mode to add some grid like faces to the entire object. I use an isooffset to convert the shape into a volume. I increase resolution so the volume closely represents the shape. This allows the scatter points to exist inside the volume and not just on the surface of the faces. I use a low count scatter into the volume and follow that up with a point replicate whose count I set to 10, down from the default of 100. Then I lower the scale on the point replicate. This gives you small clusters of points scattered around. I feed that into the voronoi fracture and it produces less uniform final pieces.

NOTE: I did not see any "strange chunks" in your original file. Do these appear during simulation?

 

Untitled-1.jpg

Edited by Atom
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thanks Atom that's quite a nice way. 
unfortunately I still get odd chunks. I wonder why you did not see them in my file.
even with your method I get them...

 

to_of.PNG

to_of2.PNG

Edited by 3dome

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in voronoifracture4, untick Create Inside Surface

(and voronoifracture2 ?....Dunno...it's cooking cooking cooking.....dunno what it's doing...)

...finally.....I think voronoifracture2 needs it ON

Edited by Noobini

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10 hours ago, Noobini said:

in voronoifracture4, untick Create Inside Surface

(and voronoifracture2 ?....Dunno...it's cooking cooking cooking.....dunno what it's doing...)

...finally.....I think voronoifracture2 needs it ON

i actually need inside surfaces. and the fracture 2 was just a test with VDBs.

anyway i fixed it. had to add quite a lot of polysplits on the inside of the walls so they have proper 4 sided polygons.

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