Detecting GameObject in a view of a Camera

Hi,

How can I detect whether a GameObject is seen by a Camera or being currently rendered on screen?

 

http://unity3d.com/support/documentation/ScriptReference/Renderer.OnBecameVisible.html

http://unity3d.com/support/documentation/ScriptReference/Renderer.OnBecameInvisible.html

http://unity3d.com/support/documentation/ScriptReference/Renderer-isVisible.html

About OnBecameVisible and OnBecameInvisible, there seems to be two tricks :
- When you launch the game, if the gameobject is in the camera frustum (between the near and far clip), OnBecameVisible is triggered. The inverse is false : when you launch the game, if the gameObject is not in the camera frustum, OnBecameInvisible is not triggered.
- Even if the gameObject is not visible (behind another gameObject), OnBecameVisible will be triggered anyway.

 

Thanks, that was so simple

 

seem it simple, but if I want appear a popup when detected gameobject by camera, how can i do? Thanks

 

If you keep track of a true/false boolean variable, and change it to true when the object is visible, back to false when not, then in GUI do something like:

//isVisible is the boolean variable
if (isVisible) {
//display dialog gui
}

Hope this makes sense and helps!