Hi Shekhar,

I read about GDV in the December 2009 issue of Linux Journal [0]. I
just downloaded it and am having some fun with the surface plots. Nice
job! Thanks especially for releasing the binary package which ran just
fine on my Ubuntu Karmic machine.

I have a VTK question... is there any way to make the VTK window
perform "live" previews? I'd like it to redraw the entire surface plot
as I click-and-drag rather than simply showing the axes in white as
I'm dragging.

I didn't see any VTKRendererWindow properties that appear to control
this behavior [1]. If I had, I would have modified them in
refreshPlot() [2]

-Tyler

[0] http://www.linuxjournal.com/magazine/new-projects-fresh-labs-14
[1] http://www.vtk.org/doc/nightly/html/classvtkRenderWindow.html
[2] http://code.google.com/p/discrete-geometry-viewer/source/browse/dgv/s...

Hi Tyler,

Thanks. Glad u found DGV useful.

I have investigated the your question. Normally, in order to force
immediate rendering, u can call the Render() member of the window.
This could be either the RenderWindow or Renderer class, can't
remember which.

However, to rerender after/during interaction is tricky. I could not
find the necessary solution.
Following <http://www.vtk.org/pipermail/vtkusers/2005-June/
080418.html> and its reply, is not an option as VTK has changed since
that post. I couldn't find that (SetNeedsDisplay) member.

Looks like u should ask on the vtkusers list, they are very
helpful.... as long as the solution is not readily been discussed and
available on the net.

HTH
Cheers
Shakes

On Mar 10, 2:51 am, Tyler <tyleroderk...@gmail.com> wrote:

Upon a second look... looks like u need to adjust parameters in the
vtkRenderWindowInteractor class. More specifically,
void vtkRenderWindowInteractor::SetDesiredUpdateRate (double)
<http://www.vtk.org/doc/release/5.4/html/
a01491.html#1a7b9baf6714b5587f0ce99a03979586>

Hopefully setting that member will do the trick.

Cheers
Shakes

On Mar 12, 2:08 pm, Shakes <shake...@gmail.com> wrote:

On Mar 11, 10:21 pm, Shakes <shake...@gmail.com> wrote:

Shakes,

As a workaround in the meantime I hacked up a script to take
sequential screen shots of DGV. You can find my results here:
http://unsyncopated.com/blog/index.php/2010/03/09/adding-a-dimension-...

Take care,

-Tyler

Hi Tyler,

That looks great! ;)

If you wanted a movie, VTK can do it for u. I have plans to allow
taking of movies in DGV, but they are a bit further down in the
timeline.

To use VTK to do it, u set the angle of the camera programatically,
use

void    FlyTo  (vtkRenderer *ren, double x, double y, double z)
void    FlyTo (vtkRenderer *ren, double *x)
void    FlyToImage (vtkRenderer *ren, double x, double y)
void    FlyToImage (vtkRenderer *ren, double *x)
virtual void    SetNumberOfFlyFrames (int)
virtual int     GetNumberOfFlyFrames ()

members from RenderWindowInteractor. You can also set the camera
directly.

Then use the WindowToImageFilter, then write a frame (of this filter)
into an AVI using AVIWriter. See <http://www.vtk.org/pipermail/
vtkusers/2007-May/091223.html> for more details. Here u can use Off-
screen rendering if your machine is not powerful enough to get the
necessary frame rate.

I would be very interested in any solution u find.

Cheers
Shakes

On Mar 12, 3:43 pm, Tyler <tyleroderk...@gmail.com> wrote: