[GEM-dev] Fwd: Re: Oculus Rift distortion/support
Michael Mihocic
michael.mihocic at oeaw.ac.at
Sun Oct 27 18:51:33 CET 2013
Hy Cyrille,
thank you again for your quick reply!!
Good idea, I also replied to the Gem list! (I'm not registered at the pd
list...)
(Sorry, if someone might be annoyed about my attachments...)
Attached you can find my progress so far but I have to mention that my
scripts are still "under construction" - and not only the parameters far
from optimized.... ;-)
My example consists of:
- rift_list.pd -> is the pd patch to be started, follow the
instructions on top of the file
- riftshader.pd is used for the distortion parameters, when using the
shaders:
- r4.frag/r4.vert are the shader files
- test.jpg is just any test file which will be distorted
I'm not using gemframebuffers in my patch. Currently I am simply loading
2 times the same image and processing the barrel distortions on each
half of the image, left and right.
But as I described below, our actual world does not consist of one image
but of many objects (spheres, cubes, lines,...) within a big sphere, and
the user can rotate his head inside the sphere. ((tracking will not be
done with Oculus Rift tracker))
-> theoretically, my perfect solution would be to apply the distortion
to "the entire stereo gemwin" somehow!? ;-)
Following the idea of your patch and introducing gemframebuffers, do you
think I can realize it that way:
- every object needs to be rendered twice instead of once, and in a
framebuffer, sent to the abstraction "gemhead_rift"
- the barrel distortion is applied in the abstraction "gemhead_rift",
the parameters depending on left or right
- instead of using "stereo", I create a wider window and add
X-axis-translation
Do you think it should work that way?
Br, Michael
-------- Original-Nachricht --------
Betreff: Re: [GEM-dev] Oculus Rift distortion/support
Von: Cyrille Henry <ch at chnry.net>
An: Michael Mihocic <michael.mihocic at oeaw.ac.at>, pd-liste List
<PD-list at iem.at>
Datum: 27.10.2013 15:59
> hello Michael,
>
> i copy this mail to pd list, since it is of generic interest.
>
>
> but first : did anyone have a working example of oculus rift in GEM?
>
> Rendering on stereo is a nice idea, but as you noticed, in order to
> "sumarized" all the object it's easier to render in a framebuffer then
> distord this resulting image.
>
> Ideally, you would use stereo parametter to render in a framebuffer,
> then render the framebuffer through a shader in the main windows
> (whitout stereo).
> but i dont thing you can do that in Gem.
>
>
> Here is how i would do it.
> 2 framebuffer, and an abstraction that render primitive in the 2
> framebuffer.
> then render this 2 framebuffer in the main windows with a shader, or
> merge this 2 FB in a 3d one and render this last FB with the shader.
>
> some things need to be adjusted (angle of view of the virtual cam /
> eyes distance /framebuffer size, etc).
> and the shader has to be added...
>
> Cheers
> c
>
> Le 26/10/2013 17:58, Michael Mihocic a écrit :
>> Hi Cyrille,
>>
>> I am still working on the Oculus Rift implementation and I finally
>> managed to get some basic knowledge with shaders. However, now I know
>> how to use shaders in Gem and on my Windows OS and I already played
>> around with simple barrrel distortion examples... Thank you again for
>> your previous support!!
>>
>> You proposed a solution (your Email below) how to implement the
>> barrel distortion to our virtual world:
>> /"1st : left eye view without distortion, rendered in a frame buffer //
>> //2nd : right eye view (no distortion / framebuffer) //
>> //3rd : using the 2 previous texture and a shader, render the final
>> image"/
>>
>> I'm still having some questions:
>> 1.) Our current world is using the gemwin "stereo" parameter to
>> create 2 images (-> actually it is one Gem window, but we adjusted
>> resolution and size to fit it to our old HMD and each eye can see
>> only half of the image; see attachement).
>> I'm wondering if it possible to use just ONE shader to render the
>> entire image in one step?? But I'm not sure if this is possible with
>> texturing??
>> If not: Will I still be able to use the "stereo" parameter in gemwin??
>>
>> 2.) As you can see in my screenshot: our world consists of many
>> objects (cubes, lines, fadecrosses, spheres, ...). How can I
>> summarize those objects, before processing them? Do I need to use a
>> gemframebuffer for every single object??
>>
>> My plan is to finish in 1(-2) months. If everything is working, I
>> will provide the example patch & shaders to the pd/Gem community.
>>
>> Best regards, Michael
>>
>>
>> Our current view:
>>
>>
>> Desired Rift distortion:
>>
>>
>>
>>
>> -------- Original-Nachricht --------
>> Betreff: Re: [GEM-dev] Oculus Rift distortion/support
>> Von: Cyrille Henry <ch at chnry.net>
>> An: Michael Mihocic <michael.mihocic at oeaw.ac.at>
>> Kopie (CC): gem-dev at iem.at
>> Datum: 25.07.2013 12:17
>>> hello,
>>>
>>> one have to use shader in order create the image distortion.
>>>
>>> i think oculus should provide standard shader that you have to
>>> insert in your rendering process.
>>>
>>> the only problem is that you have to do 2 rendering : one for each eye.
>>> The best solution is to do a 3 pass rendering :
>>> 1st : left eye view without distortion, rendered in a frame buffer
>>> 2nd : right eye view (no distortion / framebuffer)
>>> 3rd : using the 2 previous texture and a shader, render the final image
>>>
>>> cheers
>>> c
>>>
>>>
>>> Le 25/07/2013 12:04, Michael Mihocic a écrit :
>>>> Dear list,
>>>>
>>>> we are using GEM with a head-mounted-display to present a virtual
>>>> world to subjects performing acoustic localization experiments.
>>>>
>>>> Now we plan to switch from our current HMD to Oculus Rift (an
>>>> upcoming virtual reality head-mounted display). Therefore we need
>>>> to modify our image and add (asymetric) barrel distortion to the
>>>> represented image. (The image distortion is compensated by the
>>>> lenses in Oculus Rift.)
>>>>
>>>> My questions now:
>>>> - Is there an easy solution to implement barrel distortion to the
>>>> rendered window in GEM?
>>>> - Does anybody of you already have some experience with GEM
>>>> together with Oculus Rift?
>>>>
>>>> Since attachments should be avoided in this list, I do not send any
>>>> example pictures of the distortion or our current presented world.
>>>> If you are interested you can either contact me and I can send you
>>>> some screenshots, or you can google for example images/videos of
>>>> Oculus Rift distortion.
>>>>
>>>> Thanks in advance and best regards, Michael
>>>>
>>
>> --
>> Michael Mihocic
>> Psychoacoustics & Experimental Audiology
>> Acoustics Research Institute <http://www.kfs.oeaw.ac.at/>
>> Austrian Academy Of Sciences <http://www.oeaw.ac.at/>
>> Wohllebengasse 12-14 / 1
>> A-1040 Vienna, Austria
>> Tel: +43 (1) 51581 2515 (Office)
>> Tel: +43 (1) 51581 2525 (Lab)
>> Fax: +43 (1) 51581 2530
>> michael.mihocic at oeaw.ac.at <mailto:michael.mihocic at oeaw.ac.at>
>
--
Michael Mihocic
Psychoacoustics & Experimental Audiology
Acoustics Research Institute <http://www.kfs.oeaw.ac.at/>
Austrian Academy Of Sciences <http://www.oeaw.ac.at/>
Wohllebengasse 12-14 / 1
A-1040 Vienna, Austria
Tel: +43 (1) 51581 2515 (Office)
Tel: +43 (1) 51581 2525 (Lab)
Fax: +43 (1) 51581 2530
michael.mihocic at oeaw.ac.at <mailto:michael.mihocic at oeaw.ac.at>
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r4.vert
varying vec2 vTex;
void main() {
gl_TexCoord[0] = gl_MultiTexCoord0;
gl_Position = gl_Vertex;
// texIn = gl_MultiTexCoord0.xy;
vTex = gl_MultiTexCoord0.xy;
}
test.jpg
r4.frag
#define PROCESSING_TEXTURE_SHADER
uniform sampler2D texture;
varying vec4 vertTexCoord;
varying vec2 vTex;
uniform vec2 LensCenter;
uniform vec2 ScreenCenter;
uniform vec2 Scale;
uniform vec2 ScaleIn;
uniform vec4 HmdWarpParam;
vec2 HmdWarp(vec2 texIn)
{
vec2 theta = (texIn - LensCenter) * ScaleIn;
float rSq = theta.x * theta.x + theta.y * theta.y;
vec2 theta1 = theta * (HmdWarpParam.x + HmdWarpParam.y * rSq + HmdWarpParam.z * rSq * rSq + HmdWarpParam.w * rSq * rSq * rSq);
return LensCenter + Scale * theta1;
}
void main()
{
vec2 tc = HmdWarp(vTex); //gl_TexCoord[0].xy);
if (any(notEqual(clamp(tc, ScreenCenter-vec2(0.25,0.5), ScreenCenter+vec2(0.25, 0.5)) - tc, vec2(0.0, 0.0))))
discard; // gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0); // ODER: discard;
else
gl_FragColor = texture2D(texture, tc);
}
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-------------- next part --------------
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-------------- next part --------------
varying vec2 vTex;
void main() {
gl_TexCoord[0] = gl_MultiTexCoord0;
gl_Position = gl_Vertex;
// texIn = gl_MultiTexCoord0.xy;
vTex = gl_MultiTexCoord0.xy;
}
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#define PROCESSING_TEXTURE_SHADER
uniform sampler2D texture;
varying vec4 vertTexCoord;
varying vec2 vTex;
uniform vec2 LensCenter;
uniform vec2 ScreenCenter;
uniform vec2 Scale;
uniform vec2 ScaleIn;
uniform vec4 HmdWarpParam;
vec2 HmdWarp(vec2 texIn)
{
vec2 theta = (texIn - LensCenter) * ScaleIn;
float rSq = theta.x * theta.x + theta.y * theta.y;
vec2 theta1 = theta * (HmdWarpParam.x + HmdWarpParam.y * rSq + HmdWarpParam.z * rSq * rSq + HmdWarpParam.w * rSq * rSq * rSq);
return LensCenter + Scale * theta1;
}
void main()
{
vec2 tc = HmdWarp(vTex); //gl_TexCoord[0].xy);
if (any(notEqual(clamp(tc, ScreenCenter-vec2(0.25,0.5), ScreenCenter+vec2(0.25, 0.5)) - tc, vec2(0.0, 0.0))))
discard; // gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0); // ODER: discard;
else
gl_FragColor = texture2D(texture, tc);
}
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