Character Controller Falls Through Box Collider Ground 1% Of The Time!

Question

Background: Hey there! I'm working on a 2D platformer that utilizes 3D Box Colliders as terrain. Each scene has 5 or so intersecting box colliders that act as terrain. This was the easiest way for me to build out my scene, and actually gives me a high level of control.

alt text Problem: I'm currently doing beta testing with a testing company, and they have mentioned that, very, very rarely, sometimes the character controller will fall through a walkway (box collider). I've had this happen on occasion as well, more so inside the editor than in a standalone build.

Any ideas as to why this is happening? I assure you, it's not what you think:

It's not suddenly becoming a trigger
It's not disabling
It's not destroying
Once the pass through occurs, the player will always pass through (if I grab the player and move him up and drop him. Even if I switch the collider on and off, enable and disable the trigger, etc.

This happens sometimes to my player, but also sometimes to enemies that also use the Character Controller component. It's seemingly randomly.

It really is just not working. I think it might be a Unity glitch. I've had this happen only in Unity 5.

What I can say is the box colliders are not ticked as "Static". Additionally, the colliders are all separate game objects, not multiple components on one game object.

Thanks! Thomas

Answer 1

Answer by Benjames · Oct 22, 2016 at 01:38 AM

I once had to do a check with raycast from the rigidbodys last position to its current position to keep bullets from occasionally going through walls. Maybe not the most efficient way but it worked.

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atmosgames · Oct 22, 2016 at 02:17 AM 0

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Sorry, could you explain this a bit more? In my case, I'm not using Rigidbodies. I'm simply using box colliders as ground and a Character Controller.

Benjames atmosgames · Oct 22, 2016 at 04:11 AM 1

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So on void FixedUpdate try doing a spherecast or capsule cast between the character controller's last position and current position. It is a redundant check and might be computationaly expensive but it should keep the character from falling through. I used this on a phone game and it didn't hurt framerate. Let me know if you need an example.

Character Controller Falls Through Box Collider Ground 1% Of The Time!

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