[Paraview-developers] piston in 3.98

[Biddiscombe, John A.]

Dave

Nice. It is working. Thanks.

I'm very impressed. I wouldn't have thought of it being done like this, but the framework looks rather clever.

Here's a harder question if you have a moment.
My idea is to 
1) insert a painter in my chain which passes vertices (normal 3d) to cuda using the piston framework and also pass a IdType equivalent list of polygon vertex indices.
2 )within the cuda code, generate a depth list of polygons based on one vertex from each, and sort that list. Then regenerate the vertex Idlist based on the sorted order.
3) replace the painter that draws the actual primitives with a new one which uses the interop array of vertex Ids so we can do the depth sort witout retransferring stuff to and fro every frame.

The painter chain is already setup to do depth sort on the CPU, so I'd only need to add a cuda version with the interop setup and then add a new primitive painter (or some kind of painter that does the final draw instead of the existing one - might need to send the colours+opacities via interop too to avoid trouble retrieving them in the custom painter).

Can you tell me based on your knowledge of how the piston stuff works if what I propose is essentially
a) ridiculous (I'll do something else productive)
b) doable 

+ any hints which will get me there quicker.

Many thanks again

JB


-----Original Message-----
From: David E DeMarle [mailto:dave.demarle at kitware.com] 
Sent: 17 January 2013 17:05
To: Biddiscombe, John A.
Cc: paraview-developers at paraview.org
Subject: Re: [Paraview-developers] piston in 3.98

Start paraview with --use-cuda-interop

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


On Thu, Jan 17, 2013 at 11:00 AM, Biddiscombe, John A. <biddisco at cscs.ch> wrote:
> The piston plugin appears to be working, and I'm able to select a dataset, "send to piston', and then "get from piston', however when I put a breakpoint in the piston mapper and check the rendering, it always stops in RenderOnCPU.
>
> I'd like to see the RenderOnGPU working. I poked around to see if there's an option in PistonRepresentation, (or even a PistonView) which might be activated which would trigger the GPU rendering activity, but couldn't find a way to do it (without experimenting with code changes).
>
> Is there a combination of actions which displays using the GPU buffer objects.
>
> NB. PistonContour produces an output, slice and threshold produce empty results (so far).
> NB. Test machine has very old cuda support, will experiment on newer one if GPU render is possible.
>
> Thanks again
>
> JB
>
> -----Original Message-----
> From: David E DeMarle [mailto:dave.demarle at kitware.com]
> Sent: 16 January 2013 19:49
> To: Biddiscombe, John A.
> Cc: paraview-developers at paraview.org
> Subject: Re: [Paraview-developers] piston in 3.98
>
> Use piston sha 2913c77 for 3.98.
> Use piston sha b50cf296 for current master.
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
>
> On Wed, Jan 16, 2013 at 1:06 PM, Biddiscombe, John A. <biddisco at cscs.ch> wrote:
>> I wanted to try a cuda based (depth) sort, then using interop, draw 
>> polygons using opengl in a custom painter - this would save a 
>> transfer from cpu-gpu on every frame.
>>
>>
>>
>> Piston seems to have some interop facilities embedded, but I couldn't 
>> build the vtkAcceleratorsPiston using the (piston) version from github.
>>
>>
>>
>> Is piston working in 3.98? and if so, should I use a different 
>> version than the github one.
>>
>>
>>
>> Thanks for any info.
>>
>>
>>
>> JB
>>
>>
>>
>>
>>
>> --
>>
>> John Biddiscombe,                        email:biddisco @.at.@ cscs.ch
>>
>> http://www.cscs.ch/
>>
>> CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 
>> 610.82.07
>>
>> Via Trevano 131, 6900 Lugano, Switzerland   | Fax:  +41 (91) 610.82.82
>>
>>
>>
>>
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>>