Question by kerwin145 · Oct 04, 2020 at 08:00 PM · collision rigidbody collider capsulecollider

GameObject sometimes collides, but sometimes goes through each other.

I am working on a game that involves spawning in bacteria prefabs. They have a rigidbody and capsule collider component, with Collision set to Continuous Dynamic. I have isTrigger turned off to allow for Unity physics engine to take care of the collisions. The bacteria are instantiated at runtime and move through the rigidbody, with rb.velocity (kinematic is turned off).

My problem is that the objects are not colliding reliably. Sometimes they pass through each other, sometimes they bounce off (I added a physics material to the collider). It seems, after running the scene several times, that the bacteria have to pass through another bacteria, and once that occurs, the collision for the two bacteria start working, as the problem goes away a several seconds after I start the game. This action still seems to happen randomly, though, as a few bacteria just don't collide at all, so I am quiet confused as to what's causing the collisions to be ignored.

I heard that Unity has this thing where it disables collisions if any two objects are on top of each other and turns it back on when they part, but I don't think that's the issue since there are multiple bacteria on the screen, and it is well by itself yet the problem still occurs.

To add on, I do have different prefabs that are supposed to interact with the bacteria. They have sphere colliders and rigidbodies as well, but they experience the same problem.

If anyone knows the reason for this, or any solution, it would be very much appreciated. Thanks for the read!

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