A problem about surface smoothing

KeyboardMan (KeyboardMan) October 31, 2019, 7:40am 1

I used vtkPolyDataBooleanFilter for Boolean operation
vtkPolyDataBooleanFilter
Before the Boolean operation

QQ截图20191015142058.png1240×965 23.2 KB
This surface looks very smooth
But after the Boolean operation

QQ截图20191031103323.png1343×997 26.5 KB
Why is that? Is there a solution?

mwestphal (Mathieu Westphal (Kitware)) October 31, 2019, 8:03am 2

Looks like you are missing the normals in the process. You can add them back with vtkPolyDataNormals filter.

KeyboardMan (KeyboardMan) October 31, 2019, 8:42am 3

I still don’t get it. Can you be more specific?Or is there any documentation i can refer to?thank you

mwestphal (Mathieu Westphal (Kitware)) October 31, 2019, 8:51am 4

https://vtk.org/doc/nightly/html/classvtkPolyDataNormals.html#details

KeyboardMan (KeyboardMan) October 31, 2019, 8:57am 5

Ok, thank you. This is very useful