DetachChildLanded

/ Detach a child from the specified slot and unload it in LANDED mode; i.e., place it on the ground.
// slotNumber = payload slot number
// Returns: true on success, false if the child refused to be detached or if no child is in the specified slot
bool XRPayloadBay::DetachChildLanded(const int slotNumber)
{
    _ASSERTE(slotNumber > 0);

    bool retVal = false;

    // see if there is a child in the requested slot
    VESSEL *pChild = GetChild(slotNumber);
    if (pChild != nullptr)
    {
        // Must obtain "move-to" coordinates while the child is still attached!  The subclass needs the child's attachment point
        // to compute the proper coordinates.
        VECTOR3 deployToCoords = GetLandedDeployToCoords(slotNumber);   // get from the subclass; these are ship-local coordinates

        // Detach the child vessel.
        DetachChild(slotNumber, 0.0);    // no delta-V

        // obtain the child's coordinates
        VESSELSTATUS2 childVS;
        VESSEL3_EXT::GetStatusSafe(*pChild, childVS, false);

        // move the child to the deployToCoordinates by converting them (as a delta) from parent-local to GLOBAL coordinates
        VECTOR3 globalChildDeltaCoords;
        GetParentVessel().GlobalRot(deployToCoords, globalChildDeltaCoords);

        // now take the parent's rpos, apply the delta, and store it in the child's VS
        VESSELSTATUS2 parentVS;
        VESSEL3_EXT::GetStatusSafe(GetParentVessel(), parentVS, false);
        childVS.rpos = (parentVS.rpos + globalChildDeltaCoords);

        // WARNING: do not force status=1 (landed) here!  It will cause the "bounce bug" and crash Orbiter.
        childVS.status = 0;                  // set to FREEFLIGHT
        pChild->DefSetStateEx(&childVS);     // update the vessel's state with the new location

        retVal = true;
    }

    return retVal;
}