Is there any way to create buttons and other interactive things through Open GL, where the graphic, when clicked on or selected can actually do something?
Yes, but I wouldn’t recommend it. There are many good tools out there for designing user interfaces, and to write your own in GL is a tremendous undertaking. Is there any particular reason for wanting to do this, or are you just looking for a challenge?
Chris
I know of 2 very good GUI interfaces using OpenGL, called GLUI and MUI, try them.