Fix arrow type marker snapping to the ground (PR #4027, Fixes #536, Fixes #4000)

Author: FileEX

Client/multiplayer_sa/CMultiplayerSA.cpp

@@ -1575,6 +1575,14 @@ void CMultiplayerSA::InitHooks()
     // Allow alpha change for helicopter rotor (#523)
     MemSet((void*)0x6C444B, 0x90, 6);
     MemSet((void*)0x6C4453, 0x90, 0x68);
+
+    // Disable Z position changes in the matrix in the C3dMarkers::PlaceMarker (#4000, #536)
+    // To prevent arrow-type markers from snapping to the ground
+    MemCpy((void*)0x725844, "\xDD\xD8\x90", 3);
+    MemCpy((void*)0x725619, "\xDD\xD8\x90", 3);
+    MemCpy((void*)0x72565A, "\xDD\xD8\x90", 3);
+    MemCpy((void*)0x7259B0, "\xDD\xD8\x90", 3);
+    MemSet((void*)0x7258B8, 0x90, 6);
 
     InitHooks_CrashFixHacks();
     InitHooks_DeviceSelection();