Display improvement for 2D cell in basic mode.

[kerautret]

Small PR which will improve the display (faster and better quality) when only need to display simple surfers (for instance to display curvature on boundary).
Now when using:
viewer << DGtal::SetMode3D(surfel.className(), "Basic");
It will only display surfel ( signed (or not) Cell of dim 2) as a quad in a new list to allow to display front and back side.

[dcoeurjo]

what do you think of:

" - New 'basic' display mode for surfels (oriented or not), useful for large digital surface displays (quads instead of 3D prisms) "

[kerautret]

yes thank,

[dcoeurjo]

I don't understand why you had to update the "Viewer3D.ih". Have you fixed another issue in the same PR ? Could these edits be also considered in Board3D or Board3DTo2D ?

Although, great and very useful mode;)

[kerautret]

The problem is that we need to have a double sided surfel display (since by itself the surfel doesn't contain inside/ouside information) which implies an edit in Viewer3D with specific openGL setting for this list.
But yes also for Board3D and Board3DTo2D i forget them, I add it.

[kerautret]

new version with all basic sufels in the main "myQuadSetList" (no pb of double sided with default double lightning option of Viewer3D it is ok).

[dcoeurjo]

travis is failing, could you please have a look ?

[kerautret]

Ho yes sorry for the delay I look it ;(

[kerautret]

@dcoeurjo Travis should be fixed now... (sorry for the delay)...

[dcoeurjo]

thanks merging