[PD] fish eye camera distortion correction

[Py Fave]

look for the rendering order options ,

its in gemhead arguments .

there is an example in docs/advanced/14.RenderOrder.pd
and in gemhead help

py

Le mar. 23 juil. 2019 à 13:34, Csaba Láng <langcsaba at gmail.com> a écrit :

> I am getting closer to the solution, however have a bigger problem than
> expected.
> As the camera is pointing at the projection surface, I have the classical
> video feedback effect. As a result, the corrected image is getting bigger
> and bigger, and I loose more of the image,
> than the fish eye correction was made with the [curve3d].
> how could I move the image after gemframebuffer and move back with the
> offset of the pix_snap?
> Or what for the offset is made?
> Is there any method to avoid the video feedback in pix_buffer?
> Looking forward to any brilliant idea :)
>
> Popesz
>
> On Wed, Jul 17, 2019 at 10:00 PM Christof Ressi <christof.ressi at gmx.at>
> wrote:
>
>> Personally, I would always prefer a fragment shader over fiddling with
>> curve3d in GEM :-) This is probably what you want:
>> https://www.geeks3d.com/20140213/glsl-shader-library-fish-eye-and-dome-and-barrel-distortion-post-processing-filters/5/
>>
>> It might need some modification depending on the kind of texture and GLSL
>> version your using.
>>
>> Christof
>>
>>
>> *Gesendet:* Mittwoch, 17. Juli 2019 um 21:27 Uhr
>> *Von:* "Csaba Láng" <langcsaba at gmail.com>
>> *An:* pd-list at lists.iem.at
>> *Betreff:* Re: [PD] fish eye camera distortion correction
>> Thanks for the ideas.
>> Luckily I will snap the pix just once a second or two. Hope the processor
>> can handle it.
>> Which correction is easier, curve3d or the shader?
>>
>> On Wed, 17 Jul 2019 at 21:04, Jack <jack at rybn.org> wrote:
>>
>>> Sure, use a framebuffer with [gemframebuffer] to capture offscreen your
>>> scene.
>>> The problem is to send back your texture produce by [gemframebuffer] in
>>> pix_ domain to use [pix_movement] and [pix_multiblob], fortunately there
>>> is [pix_snap] for this (this process is quite slow, it depends on your
>>> hardware).
>>> Look at :
>>> Help => Gem => examples => 04.pix/ => 26.framebuffer_readback.pd
>>> to see how to use it.
>>>
>>> A note, instead off [curve3d] it is also possible to use shaders (on
>>> fragment) to do the correction of the lens distorsion.
>>> ++
>>>
>>> Jack
>>>
>>>
>>>
>>> Le 17/07/2019 à 20:36, Csaba Láng a écrit :
>>> > Looks good, but now a bigger problem came up.
>>> >
>>> > My aim is to correct the fish eye distortion for pix_movement and
>>> > pix_multiblob analyses.
>>> > Which means first I have to make the curve3d correction and then use
>>> > those pixels in pix_multiblob.
>>> > Is it possible?
>>> >
>>> > On Wed, Jul 17, 2019 at 8:16 PM Johnny Mauser
>>> > <joson.android at googlemail.com <mailto:joson.android at googlemail.com>>
>>> wrote:
>>> >
>>> >     Maybe gems [curve3d]?
>>> >
>>> >     Csaba Láng <langcsaba at gmail.com <mailto:langcsaba at gmail.com>>
>>> >     schrieb am Mi., 17. Juli 2019, 20:10:
>>> >
>>> >         Hi list,
>>> >         is there an easy way to correct fish eye camera image
>>> distortion?
>>> >         I think if a vortex kind of tool.
>>> >         Best,
>>> >         Popesz
>>> >         _______________________________________________
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