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Attached is a patch for LLGround which was just plain broken and could cause a runtime error. It now returns valid data with valid input (ie the offset does not take the position off the edge of the sim), but a runtime error will occur if invalid data is given. On invalid data the LL servers return the ground height based on a valid point closest to the effective position calculated using the supplied offset. Is the OpenSim convention to replicate the LL servers as closely as possible? If so I can submit an additional patch to replicate the LL behaviour.