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Fix BSPDecal parsing #8
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I was getting the same error in many demos after parsing BSPDecal packets so I decided to take a look.
https://github.com/VSES/SourceEngine2007/blob/43a5c90a5ada1e69ca044595383be67f40b33c61/src_main/common/netmessages.cpp#L533
Here the number of bits read for the model index is the constant SP_MODEL_INDEX_BITS, which in the 2013 SDK is 13:
https://github.com/ValveSoftware/source-sdk-2013/blob/0d8dceea4310fde5706b3ce1c70609d72a38efdf/mp/src/public/const.h#L62
However currently only 12 bits are being read; changing it to 13 worked on the demos I tested.