[Paraview] non ordered composite distributor and IceT

[Biddiscombe, John A.]

Ken

After looking through the sources a little more, I see that the example plugin RenderPassViews does something similar to what I'm after. It add a render pass at the end which applies an edge detection algorithm, This happens after compositing - which is what I need.

However, this renderpass applies to all mappers/actors in the renderer/view, so if I used this strategy, then my post processing RGB correction from the mapper+compositing would happen to all actors, and this is no good.

So it looks like what I want to do won't be possible, because there'd be no way to composite one actor individually and then blend with the others later.

Since you don't know what it is I'm trying to do, it is probably unclear, but in short, the mapper renders the data on each process, and after all RGB images are summed in the compositing phase a correction must be applied to the RGB values (but its not commutative, so can't be applied on each process individually). (unless I modify the algorithm which might be possible, I'll check on this)

One approach might be to add a separate pass which renders only the special geometry, but I suspect this will be too hard because the blending phases would all need to be tweaked so that the compositing happened twice (?) - once for the special stuff, once for everything else.

Can you tell if I've I understood things properly from my suppositions above, and if so, any other tips I might look into before I consider algorithmic changes.

Thanks

JB



From: Moreland, Kenneth [mailto:kmorel at sandia.gov]
Sent: 21 September 2011 22:30
To: Biddiscombe, John A.; paraview at paraview.org
Subject: Re: [Paraview] non ordered composite distributor and IceT

John,

If you look more closely, you should see that the data is only distributed when transparency is on.  If everything is opaque, then everything stays where it is.  If I remember correctly, there is a flag in vtkOrderedCompositeDistributor that turns it to a pass-through filter.  It's implemented like this because it's more convenient than changing around the internal pipeline.  If you never have to do ordered compositing, you could just remove this filter.  Likewise, you can set the parallel render manager to do non-ordered compositing and just forget about the parallel k-d tree.

-Ken

From: "Biddiscombe, John A." <biddisco at cscs.ch<mailto:biddisco at cscs.ch>>
Date: Wed, 21 Sep 2011 19:55:19 +0000
To: "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [Paraview] non ordered composite distributor and IceT


Can anyone point me to an example of a representarion which interacts with IceT in any n on standard way. Geometry and UGVolume Representations use a vtkOrderedCompositeDistributor and then IceT takes over.

I'd like toe skip the vtkOrderedCompositeDistributor (which is ok), but I'm not sure how to interact with IceT and see how it doe the image summation etc.

Are there any odd representations out there I can use as examples?

Thanks

JB

--
John Biddiscombe,                            email:biddisco @ cscs.ch
http://www.cscs.ch/
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82

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