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cnr-isti-vclab / meshlab

The open source mesh processing system
http://www.meshlab.net
GNU General Public License v3.0
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Bug in Simplification Cluster Decimation #1537

Closed GiovanniSer closed 1 month ago

GiovanniSer commented 2 months ago

Bug in Simplification Cluster Decimation (default values) creates also some non manifold faces. Warning because you might not realize that you are ruining a proper mesh. Win 10

GiovanniSer commented 1 month ago

In case anyone wants to debug, try applying the filter here. (ply) castleZ1.zip

cignoni commented 1 month ago

The creation of non manifold faces is indeed a well known issue of the clustering simplification algorithm (Rossignac, Jarek, and Paul Borrel. "Multi-resolution 3D approximations for rendering complex scenes." Modeling in computer graphics: methods and applications. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. 455-465.). Added warning in the documentation of the filter.

GiovanniSer commented 1 month ago

Thank you. just a small clarification, in addition to non-manifold faces I also found missing faces (small holes in the mesh). An even more insidious event because it is not perceptible at the moment.