www.algodoo.com

Draw a ring in layer J(if you dont use it)with a ray into it.

if sth goes in ray wont go on it.when its small enough it can test if there's sth on the point

eh sth go out of the screen ...

How do you plan to check laser DON'T hit ring? There is no such event.

Kilinich wrote:How do you plan to check laser DON'T hit ring? There is no such event.

When hit make a sign,and when update test