/// <summary>
/// Returns the closest point an a mesh. If cacheKDTree is set to true (default), the kdtree will be cached
/// so it can be reused later which will greatly improve performance for the sake of RAM usage.
/// </summary>
/// <returns>The point on mesh.</returns>
/// <param name="mesh">Mesh.</param>
/// <param name="point">Point.</param>
/// <param name="cacheKDTree">If set to <c>true</c> cache KD tree.</param>
public static Vector3 ClosestPointOnMesh(MeshCollider mesh, Vector3 point, bool cacheKDTree = true)
{
//If object has a mesh KDTree, use it
MeshKDTree meshKDTree = mesh.GetComponent <MeshKDTree>();
if (meshKDTree != null)
{
return(ClosestPointOnMeshKDTree(meshKDTree, point));
}
//Check if we have a KDTree for the supplied mesh
if (kdTreePool.ContainsKey(mesh.sharedMesh))
{
return(kdTreePool[mesh.sharedMesh].FindNearestPointOnMesh(point, mesh.transform));
}
else
{
//If not, create new KDTree and find closest point
KDTree kdTree = KDTree.CreateFromMesh(mesh.sharedMesh);
Vector3 result = kdTree.FindNearestPointOnMesh(point, mesh.transform);
//Cache kd tree for later use is user wants to cache it
if (cacheKDTree)
{
kdTreePool.Add(mesh.sharedMesh, kdTree);
}
else
{
kdTree = null;
}
return(result);
}
}
/// <summary>
/// Returns the closest point on a mesh KDTree.
/// </summary>
/// <returns>The vertex on KD mesh.</returns>
/// <param name="mesh">Mesh.</param>
/// <param name="point">Point.</param>
public static Vector3 ClosestPointOnMeshKDTree(MeshKDTree mesh, Vector3 point)
{
return(mesh.ClosestPointOnSurface(point));
}