Could someone provide me an example of how to draw OpenGL graphics on top of Java2D graphics? I have found this page: http://www.curious-creature.org/2005/12/21/a-swing-button-with-3d-source-codedemo/ but I didn´t find it as very pedagogic.
I would like a step-by-step guide of how to obtain a Java2D object with an OpenGL object on top.