vtkImageWriter not writing what I see on the screen?

[Anders Wallin-2]

Hi all,

I'm just learning VTK and trying to write a sequence of frames to disk
like this:
http://pastebin.ca/1664023

I do see my cone rotating on the screen, but the screenshots I get are
all of the same first frame...
I'm clearly missing something here, thanks for any help!

AW
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[Bill Lorensen-2]

How are you making the screen shots?

On Mon, Nov 9, 2009 at 4:39 PM, Anders Wallin
<anders.e.e.wallin@...> wrote:

> Hi all,
>
> I'm just learning VTK and trying to write a sequence of frames to disk
> like this:
> http://pastebin.ca/1664023
>
> I do see my cone rotating on the screen, but the screenshots I get are
> all of the same first frame...
> I'm clearly missing something here, thanks for any help!
>
> AW
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
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[David Doria-2]

On Tue, Nov 10, 2009 at 8:50 AM, Bill Lorensen <bill.lorensen@...> wrote:
> How are you making the screen shots?


Here is an example that takes a screenshot every time you press the 's' key.

http://www.rpi.edu/~doriad/VTK_List/KeyPressScreenshot/

It's in c++ - I'm not sure how helpful that will be for python?

Thanks,

David
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[Wes Turner]

Anders,

Add a call to w2if.Modified() after the renWin.Render() and before the lw.Write() calls.  The render window state has changed, but this is not reflected in the pipeline state. 

- Wes

On Tue, Nov 10, 2009 at 9:19 AM, David Doria <daviddoria%2Bvtk@...> wrote:

On Tue, Nov 10, 2009 at 8:50 AM, Bill Lorensen <bill.lorensen@...> wrote:
> How are you making the screen shots?

Here is an example that takes a screenshot every time you press the 's' key.

http://www.rpi.edu/~doriad/VTK_List/KeyPressScreenshot/

It's in c++ - I'm not sure how helpful that will be for python?

Thanks,

David

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--
Wesley D. Turner, Ph.D.
Kitware, Inc.
Technical Leader
28 Corporate Drive
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Phone: [phone]

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[Anders Wallin-2]

> Add a call to w2if.Modified() after the renWin.Render() and before the
> lw.Write() calls.  The render window state has changed, but this is not
> reflected in the pipeline state.

thanks! this works now. For fun I produced this animation:
http://www.youtube.com/watch?v=lcfLVduK-L0
I did it by first making a bunch of PNG files, then converting to JPG
and finally assembling into a DIVX file using mencoder. Does anyone
else have good tips/tricks on making movies with VTK?
AW
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