On 06/28/2015 10:59 PM, Filipe Tomaz wrote:
> The tools shows up, if drawing only lines. That is what I did before and a
> snapshoot is located on the linuxcnc forum on the thread that I posted
> before.

Oops, I missed the forum link. So there must be an attribute of the 
surface that makes the back side black. It might be lighting or surfaces 
have different colors for each side. I don't know OpenGL well enough to 
know this off-hand. It would take a bit of research and then blindly 
hacking away it until the problem gives up.

This:
https://en.wikibooks.org/wiki/OpenGL_Programming/Basics/2DObjects

indicates that counter-clockwise vertex order shows the surface face up, 
clockwise shows face down. So may reverse the order and see what happens.


-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

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