[vtkusers] OffScreen and blank window

[ABE Hiroshi]

Dear Simon and all,

I am using Carbon version of VTK, so the situation might be different  
from you, Simon.
But I checked the vtkCarbonRenderWindow.cxx as you did for Cocoa  
version, I found CreateAWindow calls ShowWindow to display the  
renderwindow. So I changed the code as:

vtkCarbonRenderWindow.cxx: 715

     if(!this->GetOffScreenRendering() ) ShowWindow(this->RootWindow);

Anyway it works as I expected, however, I am wondering if it might be  
fit to the spec.
Any suggestion?

Regards,
Hiroshi ABE

On 2009/05/20, at 22:54, Simon Drouin wrote:

> I have the same problem, though it seems to be specific to OSX. On  
> Win32, the behavior is as expected and the window doesn't show.
>
> The Mac implementation of vtkRenderWindow creates the window before  
> checking Offscreen flag. If I understand the code (Objective C,  
> which I don't master), the window is created, then its properties  
> are changed to do offscreen rendering, so you get a dead window in  
> the middle of the screen. What is worst is that the window that is  
> originally created stays on screen even after deleting the  
> vtkRenderWindow instance.
>
> s.
>
> On Wed, May 20, 2009 at 5:03 AM, ABE Hiroshi <habe36 at gmail.com> wrote:
> Dear All,
>
> I am working with an application with several VTK windows.
>
> Only single VTK window is visible and the others are hidden. But it  
> is necessary to render the hidden windows because the rendered  
> images of the hidden windows are needed to be stored as images.
>
> So I put the "OffScreenRenderingOn" to the hidden "vtkRenderWindow"s.
>
> Actually the images are properly generated as expected.
> My problem is that unexpected blank windows are pop-up-ed. I  
> believe the blank window is popup-ed when the hidden renderwindow  
> is "Render"ed.
>
> Is there any way not to generate the blank window?
>
> My Env. is:
>
> PowerMac MDD 867MHz,
> MacOS X 10.4.11
> ATI Radeon 9600 256MB
> VTK 5.4
>
> Thank you in advance.
>
> Regards,
>
> ABE Hiroshi
>  from Tokorozawa, JAPAN
>
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