Unity Mesh Collision Problems

[Battledamaged10]

Hi, I'm making a mod for KSP, and am having mesh collision problems. I use Unity. To make the mesh, I use capsule collider, because I have too many vertices for mesh collider. Because I use capsule collider, my mesh rounds off at the bottom and top, so when I try to attach stuff to the sides at the bottom or top, they end up inside the tank. Can anyone help?

[Porkjet]

Make a low-poly mesh collider!
What kind of part are you making? For a cylindrical tank it's best to create a 12-sided cylinder and use that as the mesh collider. It can even be on a seperate gameobject (as long as it's inside the part hierarchy). Just import the collision mesh and remove its mesh renderer, then add a mesh collider component. Make sure 'is convex' is ticked.
 

[akron]

2 hours ago, Porkjet said:

Make a low-poly mesh collider!
What kind of part are you making? For a cylindrical tank it's best to create a 12-sided cylinder and use that as the mesh collider. It can even be on a seperate gameobject (as long as it's inside the part hierarchy). Just import the collision mesh and remove its mesh renderer, then add a mesh collider component. Make sure 'is convex' is ticked.

I read once that you can combine colliders that allow surface attachment and collider that do not in the same object, but I cannot remember how. Do you happen to know?

[Porkjet]

Yes - create a Tag "NoAttach" and tag a collider object with it

[Battledamaged10]

5 hours ago, Porkjet said:

Make a low-poly mesh collider!
What kind of part are you making? For a cylindrical tank it's best to create a 12-sided cylinder and use that as the mesh collider. It can even be on a seperate gameobject (as long as it's inside the part hierarchy). Just import the collision mesh and remove its mesh renderer, then add a mesh collider component. Make sure 'is convex' is ticked.
 

I'm making a cylindrical fuel tank. How do you make a low-poly mesh collider?

[Battledamaged10]

6 hours ago, Porkjet said:

24 minutes ago, Battledamaged10 said:

I'm making a cylindrical fuel tank. How do you make a low-poly mesh collider?

Make a low-poly mesh collider!
What kind of part are you making? For a cylindrical tank it's best to create a 12-sided cylinder and use that as the mesh collider. It can even be on a seperate gameobject (as long as it's inside the part hierarchy). Just import the collision mesh and remove its mesh renderer, then add a mesh collider component. Make sure 'is convex' is ticked.
 

Never mind. I figured it out. Thanks for suggesting that! It really helped!

[SpannerMonkey(smce)]

24 minutes ago, Battledamaged10 said:

I'm making a cylindrical fuel tank. How do you make a low-poly mesh collider?

Just create a sphere with many fewer segments than the fuel tank, align with the main object and make it a child of the main object, export to unity,  add convex mesh collider to the sphere then remove the mesh renderer and mesh filter, you should be left with a low poly collider on a higher poly object