Raycast doesn't work from beneath MeshCollider?

Question

I have a plane with a MeshCollider, and it has weird problems with raycasting. It seems that when I cast a ray from the top of the plane, it works fine. The raycast can detect that it hits the plane. But when I cast a ray from the bottom of the plane, it doesn't detect that it hits the plane. I drew a line and the ray should hit the plane.

When I change the MeshCollider to BoxCollider, the rays work correctly.

Is there any reason for this problem? How can can I shoot a ray from beneath the plane with a MeshCollider?

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Answer by MountDoomTeam · Mar 09, 2013 at 08:52 AM

Hello, can you see the mesh from both sides? Yes Colliders are mostly made to work just in one direction, there may be a workaround for double sided planes, although in games they normally have 2 planes http://answers.unity3d.com/questions/126196/physicsraycast-not-hitting-backside-of-meshpoly.html

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xEnOnn · Mar 09, 2013 at 09:38 AM 0

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Does it mean it will only work on the side with the normal vector pointing forward?

Raycast doesn't work from beneath MeshCollider?

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