Le 11/09/2013 08:35, Michael Mihocic a écrit :

Dear list,

I tried to get familiar with shaders in GEM. I started with "01.simple_texture.pd" in folder 10.glsl.

I can start rendering (checking "rendering") but I cannot load shaders. After checking the rendering checkbox 2 errors occur:
     [glsl_vertex]: need to load a shader
     [glsl_fragment]: need to load a shader

When I try to use shaders (click on "load shader") I receive the error message:
     linking: link 1.5 3.5
     [glsl_program]: Info_log:
     [glsl_program]: Vertex info
     -----------
     (0) : error C5145: must write to gl_Position
     [glsl_program]: Link failed!

These errors occur when I either try to open a ".vert" or a ".fraq" file! Do you have any ideas what I could try to use different shaders??? Below I'm listing my system details:

are you really sure you did not modifies oher things in the shader code?
if so, could you send them to me so that i can check.
c

- pd: 0.43.4-extended
- GEM: 0.93.3
- System: Windows 7-64
- Folder contains no spaces: "C:\pd-0.43.4\extra\Gem\examples\10.glsl"
- I replaced all CRLFs with CRs as I found in https://sourceforge.net/p/pure-data/bugs/864/?page=2 (otherwise I get the errors
     [glsl_vertex]: error reading file
     [glsl_fragment]: error reading file
- I also tried to run pd with Admin permissions

Thanks in advance!!

Br, Michael


-------- Original Message --------
Subject: Re: [GEM-dev] Oculus Rift distortion/support
From: Jack <jack@rybn.org>
To: gem-dev@iem.at
Date: 25.07.2013 12:22

Hello,

Yep, and if oculus doesn't provide a shader for barrel distortion, there
is plenty of example on the web.
++

Jack



Le 25/07/2013 12:17, Cyrille Henry a écrit :

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

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--
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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