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@chnry.net
An: Michael Mihocic michael.mihocic@oeaw.ac.at, pd-liste List
PD-list@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@chnry.net
An: Michael Mihocic michael.mihocic@oeaw.ac.at
Kopie (CC): gem-dev@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@oeaw.ac.at mailto:michael.mihocic@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@oeaw.ac.at
mailto:michael.mihocic@oeaw.ac.at
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#X connect 59 0 0 0;
#X connect 60 0 62 0;
#X connect 61 0 63 0;
#X connect 62 0 64 0;
#X connect 63 0 62 0;
#X connect 63 1 62 1;
#X connect 64 0 0 0;
#X connect 65 0 68 0;
#X connect 66 0 67 0;
#X connect 67 0 68 0;
#X connect 67 1 68 1;
#X connect 68 0 69 0;
#X connect 69 0 0 0;
#X connect 70 0 71 0;
#X connect 71 0 68 0;
#X connect 71 1 68 2;
#X connect 72 0 73 0;
#X connect 73 0 68 0;
#X connect 73 1 68 3;
#X connect 74 0 56 0;
#X connect 74 0 61 0;
#X connect 75 0 55 0;
#X connect 76 0 60 0;
#X connect 77 0 65 0;
#X connect 78 0 66 0;
#X connect 79 0 70 0;
#X connect 80 0 72 0;
#X connect 81 0 77 0;
#X connect 81 0 78 0;
#X connect 81 0 79 0;
#X connect 81 0 80 0;
#X connect 81 0 74 0;
#X connect 81 0 75 0;
#X connect 81 0 76 0;
#X connect 81 0 82 0;
#X connect 81 0 83 0;
#X connect 82 0 45 0;
#X connect 82 0 46 0;
#X connect 83 0 51 0;
#X connect 83 0 50 0;
#X connect 84 0 55 0;
#X connect 85 0 60 0;
#X connect 86 0 50 0;
#X connect 87 0 84 0;
#X connect 87 0 85 0;
#X connect 87 0 86 0;
#X connect 88 0 55 0;
#X connect 89 0 60 0;
#X connect 90 0 86 0;
#X connect 90 0 88 0;
#X connect 90 0 89 0;
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);
}
