I would like to work on this task.

I would like to work on this task if you can explain me what is the diffrence between the doc file http://brlcad.org/w/images/2/2c/Optical_Shaders.pdf and what I have to do...

This task has been assigned to Andrei Tudorica. You have 48 hours to complete this task, good luck!

So that pdf is not really a tutorial.  It's an overview.

See some of our other completed GCI tutorial tasks for ideas, but basically we're looking for something more succinct that *teaches* what shaders are, describes how to use them (especially the stack shader), and gives a few examples.

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That's very close to what we're looking for, but is lacking in just a couple areas.  First off, the tutorial jumps into shader panel with some unknown example geometry (stem1.r).  The tutorial should give a concrete example.  Create a sphere (make my.sph sph), create a region (r sph.r u my.sph), go to the shader panel and pick sph.r from select from all, etc.

Then show the default shader (raytrace control panel), then show setting a non-default shader, like glass, then show stack (e.g., checker+plastic).

The last two pages that cover the goblet don't really help teach anything because you didn't create the goblet with them.  That's what makes a simple sphere example better, since you can take them from start to finish and they can follow along at home.

Make sense?

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done

That's looking better, but you don't show the making of the sphere, the making of the region, or the steps for using the stack shader.  You clearly did them, so you're just missing the text and images that show others how to do what you did.

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I think it is all you asked for :D

So it looks like you did the first half, showing how to create the sphere region, but not the second piece -- showing how to use the stack shader.  Also, you don't show how you made the renderings and the blue glass one is not visible.

A tutorial needs to be completely reproducible.  The easiest way to do that from what you have now for the renderings is to tell them before the first default sphere rendering to open the raytrace control panel and hit the raytrace button OR to type "rt" in the command window (and instead use that window screenshot).

In order to reproduce the glass sphere, you need to show what the combination editor looks like to get a sphere that looks like that.  The image you have on bullet 6 looks like default parameters so it might better belong in section 5.

Similarly in section 7, it needs to show the stacked shaders and all their parameters.  You should note that the ordering of shaders matters (e.g., that you must put plastic after checker to make it look 3D).  You totally punted in that section when you got to "Steps"... you're supposed to be showing them an example. :)

Finally, the end of the article shouldn't directly link to those pdf files at the end.  Just link tell them there's an Intro to MGED and Shaders presentation at brlcad.org/wiki/Documentation

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I am alomst done but I am not home until tomorow... (it is 23:03 here) so I will need some more time if there's no problem :D... 

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That's looking a lot better Andrei.  I see you went for half command, half graphical.  It's a reasonable compromise.  There are more changes I'd like to see, but you've put in good enough effort on this specific task to call it complete.

I'll post a follow-up task for the additions and changes I have in mind.  You're welcome to claim it or let someone else build on your work.  Thanks for all your efforts cleaning this up.

Congratulations, this task has been completed successfully.

A follow-on task has been posted:

http://www.google-melange.com/gci/task/view/google/gci2012/8082205