How to make a collider

[cukkoo]

When i make a model with mesh collider(The mesh it self) All the highlight and attachment node are gone.I then make a model with lowpoly version as a collider and in the mesh collider section i choose the lowpoly version and it fliped wrong i try to rotate but it is always wrong.when i manage to flip it right in the game the part is't in the editor PLS HELP

[wasml]

The highlight missing tells me the collider isn't working but why the attach nodes would disappear - I have no idea.

Three things to check:

1) Mesh colliders have a maximum size - 255 triangles I think. If needed you can have multiple colliders. Generally the collider will be a simplified version of the model - for example a 24 sided fuel tank typically has a 12 sided collider. And if you can use a collider primitive (box, sphere or capsule) it's even better.

2) Colliders also need to be convex - in Unity there is a checkbox in the mesh collider object you need to check.

3) Though I don't think this is your problem (both the model and collider would be rotated) when Blender exports a model using the Collada exporter the model will be rotated 90 degrees when imported to Unity - I don't know if other formats do the same.

[cukkoo]

My mesh collider has 118 tris