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By Design
Votes
24
Found in
4.3.0f4
Issue ID
575251
Regression
No
Rigidbody2d with kinematic rigidbody will not cause OnTriggerEnter2d
To reproduce:
1. Create two 2D cubes with colliders 2d
2. Attach a rigidbody 2D to one of the cubes and make the other cube a trigger
3. Attach a script with OnTiggerEnter2D (and some kind of debug message) to the rigidbody cube
4. Enter play mode and move the cube into the other cube - the debug message should get printed
5. Change the rigidbody 2d to kinematic - the debug message is no longer printed, OnTriggerEnter2d is no longer being called
Explanation: kinematic bodies (specifically colliders attached to those bodies) only collide with dynamic bodies.
The allowed collisions for body types are therefore:
Kinematic can collide with Dynamic
Dynamic can collide with Static, Dynamic & Kinematic
Static can collide with Dynamic
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MacTwiste
Dec 05, 2013 18:09
Why is this marked as By Design?
It's a pretty common case to have kinematic objects activate triggers. LIke a player entering an area to trigger an event, for instance. Do you advise using 3D collision instead or are there plans to fix this?
Andrige_
Dec 03, 2013 13:11
Agreed. My projectile system has stopped working due to this bug.