ProjectPoint(obj[i ], obj[i+1], obj[i+2], zoffset)
I see, it's just {x,y,z}... Just what i thought first. i will study it. Thanks!
Is anything i must know to understand it?

Use setPixel() or equivalent in C, since in the TI-Nspire Lua API we don't have this.
And I think that you may use a Z-buffering instead of my Z-sorting (I wish do one if I had getPixel() and setPixel() )

And one more thing, for a the faces correlation : It is a table of undetermined size tables (2, 3, 4 etc ..). Each element refers to an index in the point list. The order is important, like if you draw yourself the face with lines point by points.

Good Luck =)

I want to start with a wireframe, after blanks face with black contour. So, Z-buffer... Ow...

Don't be afraid about a Z-buffering. There are many tutorials on the internet. It is a really simple and powerfull algorithm, but, for performance, you should implement your own face filling algorithm. It is a really interesting experience.

Ok, nothing really special during the past 3 days, so I rewrote the menu engine to make it compatible with the built-in  toolpalette.

Now, I've a dual menu. Why ? It lets me now make it compatible either with the Nspire-viewer and the TI Nspire Computer Software (with my personal menu) or with the TI-Nspire handheld.
So ... why keep the built-in toolpalette ? Because I'm sure it will be enhanced in future updates of the TI-Nspire API (if you see what I mean )



Here is a comparison with the built-in toolpalette :

I have missed something: does it mean the built-in tool palette cannot be used with the player and the Computer Software?

There is. It is to the right of the click/touch pad.

What's new :
 - Modes demo, using the same code for each widget (saved)
 - Properties mode displaying the lastest selected properties
 - Text input (related to the properties mode)
 - Display objects's label
 - bugs fixed

From the Properties panel we can change directly object's data, except its name. Why ? because I store each object as : cube.[datas], cube2.[datas]

If we change the object's name, we have to :
 1) Change its name (obviously)
 2) Duplicate the object and monitor it
 3) Delete the old object

only to change its name. The name will be choosen at the object's creation.

Can we move the camera? (related with the motor...)

Related with my motor prject.
How the motor works? I dunno how directly adpat these engine in C...