Recalculate the bounding volume of the Mesh from the vertices.
After modifying vertices you should call this function to ensure the bounding volume is correct. Assigning triangles automatically recalculates the bounding volume.
function Start () {
var mesh : Mesh = GetComponent.<MeshFilter>().mesh;
mesh.RecalculateBounds();
}
no example available in C#
Note: The bounds of a SkinnedMeshRenderer can only be changed by setting the SkinnedMeshRenderer.localBounds.