[Paraview-developers] piston in 3.98

[David E DeMarle]

I think b. Getting the lists into and out of the vtkPainter parts are
the only thing I'm leary of, but that's because I haven't touched them
often.

Ollie, Chris, Ken and Utkarsh know the relevant pieces of code better
than I, so I've cc'd them specifically.

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 11:27 AM, Biddiscombe, John A. <biddisco at cscs.ch> wrote:
> 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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>>>