Hi,
When doing GUI elements in OpenGL, it's particularly useful to exactly
control the rendering order. Usually, this goes like this:
glDepthMask(0);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glEnable(GL_BLEND);
/* Render GUI back to front */
/* Note that we use Z = 0.0 all the time */
glBegin(GL_QUADS);
glVertex2f(x, y);
/* ... */
It's very easy to do directly in OpenGL, but with OSG I've currently
found it ridiculously hard. The reason is that OSG change to rendering
order to optimize things (which is good in most cases, except this one).
Is there any way to easily control the rendering order of nodes in OSG
(e.g. set a node property to tell OSG to render children nodes in
order)?
I've found render bins to be over complicated to solve this (also they
require the user to assign a unique and ordered id to each of them), and
assigning a Z value to each GUI element is also tedious and error prone.
Am I missing something?
Cheers,
Tanguy
_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
