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Question by DaneC020 · Dec 28, 2012 at 05:43 PM · collidermeshcollideraddcomponentquad

Using MeshCollider with Quads

I am running into issues with the Quad mesh option playing nice with older functionality. I have gotten past most of the issues, but this one has me stuck and my work around seems an inefficient way of handling colliders.

When you generate a mesh using MeshTopology.Quads and then add a MeshCollider component, Unity throws an error. It complains that the collider can not construct a mesh from the non-triangle data. Is there any way to overcome this issue? I would like to support both Quads and Triangles in my plugin that I am building...

It seems like the only way to work around this issue is to add the MeshCollider before the mesh data is even created. Then update it's shared mesh with a new mesh object, thus getting no warnings. This works fine when you are not providing an existing mesh a new collider, but in my case I am streaming in objects and building colliders on the fly as you get closer to them. Since these are quad meshes, I am getting errors which halt the collider generation.

Is there any workaround? Can I build a stand alone MeshCollider Object and then attach it to a gameobject? I tried using the built in AddComponent but I don't think that is possible.

Thanks so much!

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Answer by DaneC020 · Dec 28, 2012 at 09:31 PM

I have found a work around for now, but would love to know if there is a better way to handle this issue.

 //After creating the Quad mesh, setup Triangles for collider info.
 mesh.sharedMesh.SetTriangles(mesh.sharedMesh.GetTriangles(0), 0);

This satisfy the MeshCollider, but wonder if it is causing any overhead?

Thanks

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