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I'm trying to use Cell Fracture addon to 'break' simple building model but it causes additional geometry which makes model very ugly. Original model: Original model

After Cell Fracture: After Cell Fracture

I understand it is something wrong with my model because other models I tried works well. But what exactly wrong with it? I applyed location, rotation and scale but it not helps at all. I also tried to triangulate the model (previously it helped me to resolve UV unwrapping issues) but it also not helps. The .blend file is uploaded here. Thanks in advance.

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    $\begingroup$ This is usually caused by a failed boolean operation. Do you have any non-manifold or self-intersecting geometry? (I wasn't able to download the .blend for some reason..) $\endgroup$ – gandalf3 Nov 9 '14 at 0:45
  • $\begingroup$ Thanks for quick response. Yes, the model have non manfold elements on the roof. Unfortunately I can't fix it right now and check but seems it is the reason why Cell fracture works unexpected. Thank you for your help. $\endgroup$ – Shoar Nov 9 '14 at 1:08

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