Dear Haibin,
Use the vmtkrenderer script and then vmtksurfaceviewer for each surface.
You can set opacity in case the second surface is inside the first one (for 
example a centerline)

vmtkrenderer --pipe vmtksurfaceviewer -ifile sup1.vtp -opacity 0.25 --pipe 
vmtksurfaceviewer -ifile sup2.vtp

Press 'q' to go further to the second rendering.

Simone

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On Apr 15, 2013, at 2:57 PM, Haibin Cai <jlcaihai...@gmail.com> wrote:

> Dear vmtkusers,
>     I want to display two surface together in vmtk. The command of 
> "vmtksurfacereader -ifile foo1.vtp --pipe vmtksurfacereader -ifile foo2.vtp 
> --pipe vmtksurfaceiviewer"  can only display the second surface. Does there 
> exist anyway that I can show them together?
> Thanks
> haibin
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Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
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