Change datatype of ZPD to fload/double #100
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The fixed parameter ZPD (XnFixedParams::fReferenceDistance) is stored in firmware as float type, see XnFixedParams in Source/Driver/PS1080/Sensor/XnDeviceSensor and function "XnHostProtocolGetFixedParams" in /Source/Driver/PS1080/Sensor/XnHostProtocol.cpp.
ZPD is used to convert disparity map to depth map, see line 66 of /Source/Driver/PS1080/DDK/XnShiftToDepth.cpp. You can find that this value is converted to double here for following computing.
Therefore, this value shouldn't be convert to int type during parameter passing.