[vtkusers] multiple Maximum Intensity Projection (volume rendering)

[Stéphane CALANDE]

Thanks Kevin,

There is a last think I want to know.

I'd like to generate a MIP without displaying it on the screen.
I mean : I just want to save the MIP as a file " ***.png ", without
displaying it, in order to accelerate the process.

After that, I will display all the png files and it will look like a volume
which revloves on himself, you see?

Is it possible to do that ?

I've tried "->SetOffScreenRendering( 1 );" but it didn't work.


There is an other reason why I want to do that. When I use
"vtkWindowToImageFilter", I can't minimize the window... otherwise the
printscreens don't contain the MIP rendering but a part of my computer
desktop... Not really practice because I always must keep the vtk window on
top (for a couple a minutes).



Thank you again for your help Kevin,


Best regards,


Stéphane





2009/1/26 Kevin H. Hobbs <hobbsk at ohiou.edu>

> On Mon, 2009-01-26 at 16:52 +0100, Stéphane CALANDE wrote:
> >  Hi vtkusers,
> >
>
> > 1) I find that the rendering is not so beautiful. The picture is a
> > little vagueness. Can I do something to improve that?
>
> vol_mapper->SetImageSampleDistance( 0.25 );
> vol_mapper->SetSampleDistance( pix_diag / 5.0 );
>
>
> vol_prop->SetScalarOpacityUnitDistance( pix_diag );
>
> > 2) It takes a lot of time to display one MIP (about 2.83 second per
> > MIP on my computer (WinXPx64))
>
> Don't do 1) above.
>
> > 3) The distance between the focal point and the camera position is
> > determined by the variable "distanceFocale". But I've some trouble
> > with the value of that variable. I don't know which value I have to
> > assign to it, because : if I assign it a too high or too low value,
> > there is no result (black window). The rest of the time, the maximum
> > intensity projection doesn't take into account all the volume but only
> > a part of it (it seems that the distance is too small).
> >
>
> camera->SetFocalPoint ( center );
>
> camera->SetViewUp   ( view_up );
> camera->SetPosition ( view_pos );
>
> camera->ComputeViewPlaneNormal(); // Maybe ?
>
>
> > PS: thanks for your help, Kevin.
>
> You're welcome.
>
> I pulled my comments from the attached file.
>
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