[vtkusers] Applying post-processing shader

[David E DeMarle]

You could do the window2image (external) route. Something like
  render to back buffer
  grab rgb(z?) from window
  apply your operation to pixels
  replace back buffer
  swap
could work.

I think that the multi pass rendering framework (internal) route though
will probably be better though once you wrap your head around it. For
details see:
  http://www.vtk.org/Wiki/VTK/MultiPass_Rendering





David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Thu, Mar 5, 2015 at 1:52 PM, WeltMarco <godimarcovr at gmail.com> wrote:

> Hi all,
> i'm currently working on a project in which i need to apply a
> post-processing shader to a rendered scene (in particular it is a barrel
> distortion shader).
>
> The problem is, by applying the shader on the actor's vtkProperty i can
> only
> intervene on the actor's model (for example a shader that paints everything
> red, will only make the actor red) but i need it to intervene on the scene
> already rendered (so if i apply the same red shader, it will turn
> everything
> red).
>
> I was thinking of extracting an Actor2D by going through the WindowToImage
> filter, but there is nothing about shaders on the vtkProperty2D.
> Is there a way to do this in VTK?
>
> Thank you in advance for your help
> Marco
>
>
>
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