[vtkusers] OffScreenRender and polydata problem

[amri karim]

Hi Joe,

I had similar problems of partial drawing with
offscreen rendering until I call the Frame() function
of the render window prior to using the rendered
scene. Try that prior to capturing the bitmap.  

- amri



Hello all!
I'm using vtk under windows with
vtkWin32OpenGLRenderWindow object that I wish to
render to offscreen and then pipe to
vtkWindowToImageFilter.  the actors in the mapper to
the window consist of two Actor2D's; one is an image,
the other are some lines.  the image appears just fine
but the lines only appear partially (and sometimes not
at all) when I'm using OffScreenRendingOn and in full
when actually rendering to the screen.

the lines are drawn using the pipeline:
(vtkPoints+vtkCellArray)->PolyData->PolyDataMapper2D->Actor2D
then I simply add the image and the lines to the
renderer (vtkOpenGLRenderer), add the renderer to the
renderwindow, render, add the renderwindow to the
filter and capture as a BMP.

any ideas why this may be occurring?  I've tried
pretty much everything that I can think of and nothing
seems to be working.

thanks in advance!
-joe