[vtkusers] display arrows on a surface mesh

[Jérôme]

Hi,
a vtkArrowSource produces a vtkPolyData. So you can do any manipulation on
it. If you translate the arrow by 0.5 on x, then the origin at the glyphed
point will not be the arrow base, but the middle of the trunk (ending point
is at (1,0,0) whereas base trunk is at (0,0,0)).

However, this tip depends on your application. If this is just a
visualisation problem, is as surface opactiy of 0.5 not sufficient?

HTH,
Jerome

2009/12/7 Zhangyuanchao <woshizhangyc at yahoo.cn>

> Hi, there,
>
> I would like to display arrows on a closed surface mesh. Given that the the
> arrows may point inside and outside the surface, I can see the arrows
> pointing outside the surface using vtkGlyph3D and vtkArrowSource. However,
> the arrows pointing inside is not visable. How can I pull out the arrows
> pointing inside?
>
> Is there any function by which I can chang the role between the start
> point  and end point of an arrow?
> or How can I manage to solve the problem? Is there any other way?
>
> Thanks a lot!
>
> yuanchao
>
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