[PD] strategy to apply shaders/motion blur to pmpd in a 1900x800 rectangular gemwin

[Marco Donnarumma]

Hi Cyrille,

ok, I now managed to use gemframebuffer in a smaller test patch. For some
reason, in my larger patch it crashes everytime I connect it to the pmpd
system. Had to use [scaleXYZ 0.5 1 1] to fit the rectangular dimension of
the gemwin.

Could you explain a little more how you achieve the motion blur?
i.e. what do you mean with "just render 10 primitives for every image..."?

thanks!
M




--
Marco Donnarumma
New Media + Sonic Arts Practitioner, Performer, Teacher, Director.
Embodied Audio-Visual Interaction Research Team.
Department of Computing, Goldsmiths University of London
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Portfolio: http://marcodonnarumma.com
Research: http://res.marcodonnarumma.com
Director: http://www.liveperformersmeeting.net


On Tue, Nov 5, 2013 at 11:35 AM, Cyrille Henry <ch at chnry.net> wrote:

> hello Marco,
>
> better than snap2tex, you can use rendering in framebuffer. The
> framebuffer can directly be rendered as a texture, no snapping is needed.
>
> i did not understand the way you make your motion blur.
> I  usually have my model to run at a frequency 5 or 10 time faster than
> the rendering. then, you can just render 10 primitives for every image...
> or make 10 rendering per frame, and average them in the final render.
>
> cheers
> c
>
>
>
>
> Le 05/11/2013 12:08, Marco Donnarumma a écrit :
>
>> Hi all,
>>
>> I have a 1900 x 800 gemwin. I render a few geos on a big [sphere] and a
>> pmpd system on top of it.
>>
>> I'd need some cpu-friendly motion blur and glow effects on everything
>> rendered in the gemwin.
>>
>> My strategy so far has been to split the final rendering into two 800x800
>> squares. That is:
>>
>> I have two [snap2tex] snapping two separate [gemwin -1] onto two
>> [square]. One [snap2tex] has 0 0 offset, and the other has 800 0 offset.
>> Then, by modulating the opacity of [colorRGB] for the 2 squares I can get
>> motion blur effect.
>>
>> This works fine, but the same splitting strategy doesn't work for
>> shaders. If I apply a shader to the two [square] the coordinate of the
>> texture are all mixed up.
>>
>> Also, when applying the shaders the cpu go up +30%, whereas [snap2 tex]
>> takes way less resources. is that normal?
>>
>> What's the best way to go here?
>>
>> thanks!
>> best,
>>
>> --
>> Marco Donnarumma
>> New Media + Sonic Arts Practitioner, Performer, Teacher, Director.
>> Embodied Audio-Visual Interaction Research Team.
>> Department of Computing, Goldsmiths University of London
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Portfolio: http://marcodonnarumma.com
>> Research: http://res.marcodonnarumma.com
>> Director: http://www.liveperformersmeeting.net
>>
>>
>> _______________________________________________
>> Pd-list at iem.at mailing list
>> UNSUBSCRIBE and account-management -> http://lists.puredata.info/
>> listinfo/pd-list
>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20131105/2fb6f63f/attachment.htm>