[Paraview] Contribution : Silhouette edges filter

[Moreland, Kenneth]

Filters within ParaView have no access the camera for a variety of reasons.  If you want the filter to update with new camera positions, you will have to integrate it into a representation/view.  Representations and views can be added with plugins, they just take a bit more work than adding a filter.

A new feature that is available on the ParaView development branch and will be available in 3.4 is the ability for a plugin to add a new representation to the 3D View (the default view within ParaView).  Right now, the feature is undocumented, but documentation should be coming soon.  Perhaps Utkarsh can fill in here.

-Ken

________________________________
From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Paul Edwards
Sent: Wednesday, July 30, 2008 4:14 AM
To: Thierry.CARRARD at cea.fr
Cc: guillaume.colin-de-verdiere at cea.fr; Laurent.COLOMBET at cea.fr; Jean-Philippe.NOMINE at cea.fr; paraview at paraview.org
Subject: Re: [Paraview] Contribution : Silhouette edges filter


The filter looks good.  I've tried to create an XML file to use in
ParaView.  I've attached my attempt although I don't know how to
initialise the camera or prop.  Can anyone help here?

Regards,
Paul

2008/7/30  <Thierry.CARRARD at cea.fr>:
> Dear colleagues,
>
>
>
> Here attached is a vtk filter that extracts silhouette edges from a poly
> data.
>
> Silhouette of a surface is made of lines lying on the surface where the
> surface normal is orthogonal to a direction.
>
>
>
> Such edges are useful to produce CAD or sketch like drawings. It can be
> combined with a constant colored surface rendering to hide non-visible
> edges.
>
>
>
> Attached example images are made from an iso-surface, but much nicer results
> are achieved when working with lagrangian numerical simulations.
>
>
>
>
>
> Usage:
>
>
>
> Pipeline: vtkPolyData à vtkPolyDataSilhouette à vtkPolyDataMapper à vtkActor
>
>
>
> Parameters: SpecifiedVector and CameraVector modes use a uniform direction
> (resp. explicit or from a camera), while SpecifiedOrigin and CameraOrigin
> modes use the origin-to-center-of-the-edge direction. CameraOrigin mode is
> the one to use to produce sketch like drawings.
>
>
>
> tips: try to combine black silhouettes edges (with line width between 1 and
> 3) with different kinds of surface base renderings (with or without
> lighting, constant colored or one color per material). It emphasizes very
> well the shape of some phenomena, especially for numerical simulations.
>
>
>
> Note: Silhouette edges can also serve to generate shadow volumes, but this
> would need an additional contribution.
>
>
>
>
>
> Contribution :
>
>
>
> Author:
>
> Thierry Carrard
>
>
>
> Affiliation:
>
> Commissariat à l'Energie Atomique (CEA), Direction des Applications
> Militaires, Département des Sciences de l'Information et de la Simulation.
>
> BP12, 91680 Bruyères Le Chatel, France.
>
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>
>
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