i am working on a project that contains a 3d box that rotated by user touch and opens revelant page when clicked on a side. each side has link to another view so i need to know which side is clicked on the program.
i am using Brad Larson’s wonderfull example in my app and i can rotate the cube with touch, thanx to his code and time.
( the code is linked in here: Where to start openGL ES to create and rotate a cube in an iPhone? )
now i need to know how to detect whick side is clicked on the box. normally i develop view based applications, i really have no idea on openGL or things like that.
i’ve searched the site but couldnt find a good answer (at least something that i can understand with my opengl knowledge)
P.S: Here, the 3dCube code from Brad Larson: http://www.sunsetlakesoftware.com/sites/default/files/CubeExample.zip
Take a look here: http://www.3dkingdoms.com/selection.html
In the OpenGL world, I think they refer to this as “picking”. The utility function gluunproject will help you. Intersecting the picking ray with your model’s faces should not be hard for a cube.