Fix #523: Helicopter rotor unaffected by vehicle alpha (PR #3596)

Author: FileEX

Client/multiplayer_sa/CMultiplayerSA.cpp

@@ -1569,6 +1569,10 @@ void CMultiplayerSA::InitHooks()
     // Fix invisible vehicle windows when lights are on (#2936)
     MemPut<BYTE>(0x6E1425, 1);
 
+    // Allow alpha change for helicopter rotor (#523)
+    MemSet((void*)0x6C444B, 0x90, 6);
+    MemSet((void*)0x6C4453, 0x90, 0x68);
+    
     InitHooks_CrashFixHacks();
 
     // Init our 1.3 hooks.