Detecting clicks on elements

[aviralg]

The following tutorial describes a process called ray-picking which will allow us to map mouse clicks on individual graphical elements like line, cylinder etc. There is no easy way to do it.

http://schabby.de/picking-opengl-ray-tracing/

[ccluri]

Since we are using libqglviewer, the hard work of all this is already done. Refer to http://www.libqglviewer.com/examples/mouseGrabber.html and http://www.libqglviewer.com/examples/select.html or the equivalent codes from pyqglviewer examples/mouseGrabber.py and examples/select.py (https://gforge.inria.fr/scm/viewvc.php/trunk/examples/?root=pyqglviewer)

Other useful examples showcasing the full features, at http://www.libqglviewer.com/examples/

I will implement a version of in the next week. Thanks for the comment

[ccluri]

Turns out is it more complicated than all the above examples. See http://stackoverflow.com/questions/4040616/opengl-gl-select-or-manual-collision-detection and http://www.java-gaming.org/index.php?topic=13346.0 and http://www.lighthouse3d.com/opengl/picking/index.php3?color1 for some basics.

if we want efficiency - selection gets tricky. The mess is because we use VBO's.