How can I select an object from screen?

[Hanyu Liu]

Hi, all
How can I select an object I drawn from the screen? For example, I
draw 4 cubes in different locations, with different names, like A, B,
C and D, without occlusions. If I click one cube, I could know which
cube is selected. Can some one tell me which classes should be used
and the main process to implement this?
Thank you!

[Morgan McGuire]

I'd use GCamera's world ray function to get a ray from the mouse position and CollisionDetection's ray-box intersection to find which box it hit.

-m

Prof. Morgan McGuire
Computer Science Department
Williams College
http://cs.williams.edu/~morgan

[Hanyu Liu]

Thank you very much, Morgan.
Ray-box intersection is not a defined function of CollisionDetection,
right? I need to use Ray::intersection or Ray::distance to determine
which box is hit by the ray.

[Morgan McGuire]

See collisionTimeForMovingPointFixedAABox

-m

Prof. Morgan McGuire
Computer Science Department
Williams College
http://cs.williams.edu/~morgan

[Hanyu Liu]

Thank you, Morgan!
It works well!