How to make a hollow collider?

[Sharpy]

How to make a hollow collider, like a cargo bay?

If my collider is 'convex', it won't allow putting stuff inside. If I combine multiple colliders, it kinda works except parts can be surface-attached only to the first of them. What should I do if I want to make, say, a hollow tube?

[CobaltWolf]

What do you mean they can only be attached to the first? I don't believe I've had that experience. You're on the right track with having multiple convex colliders.

[Sharpy]

1 hour ago, CobaltWolf said:

What do you mean they can only be attached to the first? I don't believe I've had that experience. You're on the right track with having multiple convex colliders.

Precisely what I'm saying, the top-most one appearing on the list of elements in Unity.

Say, I did this:

Simple two box colliders with free space in between. It behaves correctly when "launched" but in VAB it behaves pretty much as if the part only had one of these two colliders. I can't grab the part by the bottom collider, I can't attach anything to it, I can't rightclick on it - also, can't rightclick on it after launch, even though the cube will roll like a cube, both colliders interacting with the ground.

 

edit: clarifying "bottom" - appearing on the bottom in Inspector; the one with Z:0.09. If I reorder them, the other one will become inactive.

Edited November 30, 2016 by Sharpy

[Stone Blue]

I'm certainly not an expert, but have you tried assigning "Mesh Collider", instead of "Box Collider"?
And then make sure you check the "Convex" check box for each

 

Edited November 30, 2016 by Stone Blue

[Sharpy]

Would need to create these first. Although I know for a fact mixing one Mesh and one Box results in the same.

[CobaltWolf]

uhm, you don't need all the colliders in the same object. Create more empty gameObjects and give them box colliders. @Stone Blue if he can do it with box colliders then that's better in terms of efficiency.

[wasml]

I have a part I made with numerous box colliders for a hollow part and am able to surface attach and grab by more than just the first collider. The only thing I see different with your setup is the Hierarchy - mine was:

Empty game object

     - Mesh

     - collider 1

     - collider 2

     ....

     - collider N

Not sure if the above is clear - what I'm saying is that the colliders were on the same level as the mesh - not child objects.

[Sharpy]

@wasml: yep, multiple objects, each with one Collider component, instead of one object with many collider components.

[RaendyLeBeau]

17 hours ago, wasml said:

I have a part I made with numerous box colliders for a hollow part and am able to surface attach and grab by more than just the first collider. The only thing I see different with your setup is the Hierarchy - mine was:

Empty game object

     - Mesh

     - collider 1

     - collider 2

     ....

     - collider N

Not sure if the above is clear - what I'm saying is that the colliders were on the same level as the mesh - not child objects.

i agree - its the correct way to solve the problem.