[vtkusers] Extracting normals from polydata add points ?

[kenichiro yoshimi]

Hi,

Sorry for my late reply.

There is a complete difference of computed normals between splitting
on and off, since the algorithm works by determining normals for each
polygon and then averaging them at shared points and each of points
duplicated by splitting shares the different divided polygons
respectively. (See attached)
Unless you need to prevent blurry edges due to Gouraud shading, you
don't have to set splitting on.

Thanks

2017-09-29 22:51 GMT+09:00 Nicolas Cedilnik <nicolas.cedilnik at inria.fr>:
> Hi again,
>
>> Could you try to turn off the option for splitting of sharp edges?
>> ---
>> normals_generator.SplittingOff()
>> ---
>
> …and that was it. It's a feature I didn't pay attention to.
>
> My next question would be: does turning this off affects normal values
> of the pre-existing points ?
> Should I leave it on and filter the result to the first n points as I
> did before for better normals estimation ?
>
> Thanks !
>
> -- Nicolas
>
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