[Paraview] GLSL shaders and Paraview

[Moreland, Kenneth]

Since shaders were at one time available in ParaView, there are probably still remnants in the server manager that allow you to set shaders through proxy objects.  Perhaps the original implementer of the shader GUI in ParaView 2.6 could speak up.  I think that was Utkarsh, but I'm not sure.

-Ken

> -----Original Message-----
> From: paraview-bounces+kmorel=sandia.gov at paraview.org [mailto:paraview-
> bounces+kmorel=sandia.gov at paraview.org] On Behalf Of Thomas Félix
> Sent: Wednesday, December 19, 2007 3:20 AM
> To: paraview at paraview.org
> Subject: Re: [Paraview] GLSL shaders and Paraview
> 
> Thanks for the answer.
> 
> In fact I'm working directly with the c++ sources of Paraview, so I try
> to implement shaders using and creating new c++ classes/custom
> filters... I now understand the fact that a vtkProperty can't be
> directly accessed by a custom filter, but I'm pretty sure there's a way
> to access actors present in the scene, in order to set the shader I
> want... (I have already seen it working, but using a dirty trick in the
> paraview code, and I would like to implement it as part of a plugin or
> new functionality). Maybe creating a specific display panel with a
> "shader" property exposed to users...
> 
> 
> 
> Moreland, Kenneth a écrit :
> > I'm not sure if you really mean a custom filter (which is simply a
> collection of filters that behaves like a single filter) or a programmable
> filter (which is a filter that executes a python script to manipulate the
> data), but either way you cannot access vtkProperty.  In ParaView, just as
> in VTK, a filter does not have direct access to vtkProperty or any other
> rendering parameters.
> >
> > A lookmark may be closer to what you want.  Lookmarks save a subset of
> the state relating to some section of the pipeline, including rendering
> parameters stored in vtkProperty.  However, this still doesn't get you to
> what you want to do, because ParaView 3 does not expose shader
> functionality.
> >
> > In the move from ParaView 2 to ParaView 3, we lost the ability to add
> shaders to objects because (1) this feature is a low priority for most
> users and (2) the implementation did not seem to cover many of the use
> cases interested users had.
> >
> > Unfortunately, I can think of no easy way to enable shaders in ParaView
> 3.  You would either have to add the functionality to the ParaView code or
> create a plugin that defined a new view that supported shaders.
> >
> > -Ken
> >
> >
> >> -----Original Message-----
> >> From: paraview-bounces+kmorel=sandia.gov at paraview.org [mailto:paraview-
> >> bounces+kmorel=sandia.gov at paraview.org] On Behalf Of Thomas Félix
> >> Sent: Tuesday, December 18, 2007 9:06 AM
> >> To: paraview at paraview.org
> >> Subject: Re: [Paraview] GLSL shaders and Paraview
> >>
> >> Yes you're right Ken, I apologize for my lack of precision. In fact I'm
> >> new with Paraview so I'm exploring different approches for the
> moment...
> >> I want to access the vtkProperty (or vtkActor) as part of a custom
> >> filter, because I need to compute things using a shader, but I also
> have
> >> to integrate functions in the classic filter way... (as part of the
> >> RequestData method for example). I think directly using the vtkProperty
> >> is a good (easy?) way to use shaders in paraview but maybe I'm totally
> >> wrong... So if someone can at least guide me in my futur
> investigations,
> >> it should be great.
> >>
> >> Thanks.
> >>
> >> ----------------------------
> >> Thomas Felix
> >> Inria Rhone-Alpes
> >> EVASION team
> >> ----------------------------
> >>
> >> Moreland, Kenneth a écrit :
> >>
> >>> So far you have been pretty vague about what mechanism you are trying
> to
> >>>
> >> accomplish.  How are you trying to access the vtkProperty?  With python
> >> scripting?  In a plugin?  In a custom client?  As part of the custom
> >> filter?
> >>
> >>> -Ken
> >>>
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: paraview-bounces+kmorel=sandia.gov at paraview.org
> [mailto:paraview-
> >>>> bounces+kmorel=sandia.gov at paraview.org] On Behalf Of Thomas Félix
> >>>> Sent: Tuesday, December 18, 2007 7:54 AM
> >>>> To: paraview at paraview.org
> >>>> Subject: Re: [Paraview] GLSL shaders and Paraview
> >>>>
> >>>> As my questions are not very popular, I have at least one thing to
> ask
> >>>> on this topic...
> >>>> When I create a new custom filter and use it on an object, can I
> access
> >>>> to the actor which depends on it ?
> >>>>
> >>>> every answers will be helpfull...
> >>>>
> >>>> /Thomas Felix
> >>>> Inria Rhone-Alpes
> >>>> EVASION team/
> >>>>
> >>>>
> >>>> Thomas Félix a écrit :
> >>>>
> >>>>
> >>>>> Hello,
> >>>>>
> >>>>> To put it more clearly, I just want to know how to access to the
> >>>>> properties (vtkProperty) of an object created in paraview...
> >>>>>
> >>>>> thanks
> >>>>>
> >>>>> Thomas Félix a écrit :
> >>>>>
> >>>>>
> >>>>>> Hello Everyone,
> >>>>>>
> >>>>>> I want to create custom filters for Paraview using GLSL shaders. I
> >>>>>> have written vtk samples that work (thanks to the vtkProperty class
> >>>>>> and its LoadMaterial method) but I really don't know how to plug
> this
> >>>>>> in a paraview filter... How can I access to the property of an
> object
> >>>>>> ?  Do I  really have to write a filter in such a situation ?
> >>>>>>
> >>>>>> Thanks for your answers...
> >>>>>>
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