Hi Pilou,

> Does it possible to have a special black color style
> who don't react with the light?

You can give a style a very dark but not quite totally black color to make it display on screen as black.

So for example set the style's color to something like rgb = 1,1,1

That will then shade as a very dark black color instead of shading as white.

The default black style with rgb = 0,0,0 displays wires (curves and edges) as black but will display shaded surfaces as white.

- Michael