Re: [Maya2osg-users] Customized GLSL shaders

[Javier T. <jav...@gm...>]

  Hi,

On Tue, May 24, 2011 at 9:06 AM, Peter Wrobel <pp...@cg...> wrote:

>>    There is an UI option to enable the custom code feature and four
>> corresponding to the four code blocks above mentioned. And here,
>> Peter, I'm going to ask for your skills on Maya UI creation. I created
>> 5 new optionVars and the UI for them (basically copy&  paste of your
>> code :). Please, review it when you have time, just in case I have
>> done some nonsens. I also put "Browse" buttons after the text boxes,
>> but I don't know what is the most adequate way to make it work and the
>> script is growing dangerously, so I don't want to complicate it
>> further. Can you take a look at it, please? It would be nice also to
>> enable/disable the four text box / browse buttons depending on the
>> checkbox "Custom GLSL code".
>
> Working on that. Would be nice, if you could provide me some test scene
> and shader.

  The test shaders I am using do not work in a standard OSG viewer,
unless you load it in the proper 3D engine you won't see anything. But
for testing purposes any scene can do. Just add a fragment code like
this:

  gl_FragData[0] = vec4(0.0, 1.0, 0.0, 1.0);

  And you'll test if it is working.

  Anyway, if you modify the UI let me know and I will test it also.

> You're right with the growing, thing should split it up somehow, but
> then there are lot of local functions which are needed almost
> everywhere. Will look into this.

  I am OK with it, I let you its organization, I just didn't want to
add more complexity nor to change the way to organize things. It is on
your hands.

> I would require motionvectors too, could you tell me how you are
> approaching this within one shader ?
> Thought one needs the same mesh from two different time stamps to get
> the position differences, but have not figured out the most efficient
> way store position mesh mesh data in a additional array. I tried to get
> Transfor Feedback to work, but I don't understand osgs extension
> mechanism well enough. So, how do you do it ?

  It is explained in the paper I am presenting next month in
Vancouver. I'll send you the information.


  Regards,

-- 
Javier Taibo