[Paraview] non ordered composite distributor and IceT

Mon Sep 26 09:40:32 EDT 2011

Hi John,

I see two solutions to your pb : 
1/ you can setup special keys to tell the renderpass if a given actor 
should be rendered or not by this pass. You can then branch your 
renderpasses on two paths, one that does your special compositing and 
post-processing on the actors that you flagged with the special key, one 
that does traditionnal rendering for all other actors, and you then need 
to compose the 2 resulting images.

2/ You could setup an internal renderpass on your mapper that uses the 
IceT compositing mechanism, apply your post-processing internally, then 
render the result of this compositing on the current framebuffer.

Option 2 should be better since your render effect seems to be 
actor-centric.
Best,
Stephane

Stephane PLOIX
Chef de groupe
EDF – R&D / SINETICS
Réalité virtuelle et visualisation scientifique
1, av du General de Gaulle
92140 Clamart

stephane.ploix at edf.fr
Tél. : 01 47 65 51 10

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biddisco at cscs.ch 
Envoyé par : paraview-bounces at paraview.org
25/09/2011 22:15

A
kmorel at sandia.gov, paraview at paraview.org
cc

Objet
Re: [Paraview] non ordered composite distributor and IceT

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>
Date: Wed, 21 Sep 2011 19:55:19 +0000
To: "paraview at paraview.org" <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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