determine if object is on screen

[lebasti]

Hello!

How can I determine that an object (an "playmarker" represented by an glquad) is still visible or has already left the visible area? My aim is to make some sort of auto-scrolling like in wave-editors; when the marker reaches the right edge, the whole screen (the "camera") should be shifted so that the marker is at the left edge of the screen again. Maybe i am too lazy, but I couldn't find anything here what could help me with this.

thanks for reading (and maybe answering )

basti

[lebasti]

ok, i think picking will do this job... hav a try...