Use ref when passing structs by pointer through P/Invoke. This fixes positions and angles not being updated correctly in 32-bit builds. This was not a problem in 64-bit mode (probably because an entire vec3_t fits into a single register and the call is optimized as such) but it is in 32-bit mode.

Assets/Scripts/Modules/GameModule.Interop.cs

@@ -48,10 +48,10 @@ public partial class GameModule : CallbackHandler<GameModule>
     }
 
     [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
-    private delegate void GameSetEntityTransformCallback(IntPtr target, int entityNum, QVec3 origin, QVec3 angles);
+    private delegate void GameSetEntityTransformCallback(IntPtr target, int entityNum, ref QVec3 origin, ref QVec3 angles);
 
     [MonoPInvokeCallback(typeof(GameSetEntityTransformCallback))]
-    private static void Callback_GameSetEntityTransform(IntPtr target, int entityNum, QVec3 origin, QVec3 angles)
+    private static void Callback_GameSetEntityTransform(IntPtr target, int entityNum, ref QVec3 origin, ref QVec3 angles)
     {
         GetSelf(target).SetEntityTransform(entityNum, origin, angles);
     }

Assets/Scripts/Modules/RenderModule.Interop.cs

@@ -124,10 +124,10 @@ public partial class RenderModule: CallbackHandler<RenderModule>
     }
 
     [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
-    private delegate void SetupViewCallback(IntPtr target, QVec3 origin, QVec3 angles, QLeaf viewLeaf);
+    private delegate void SetupViewCallback(IntPtr target, ref QVec3 origin, ref QVec3 angles, ref QLeaf viewLeaf);
 
     [MonoPInvokeCallback(typeof(SetupViewCallback))]
-    private static void Callback_SetupView(IntPtr target, QVec3 origin, QVec3 angles, QLeaf viewLeaf)
+    private static void Callback_SetupView(IntPtr target, ref QVec3 origin, ref QVec3 angles, ref QLeaf viewLeaf)
     {
         GetSelf(target).SetupView(origin, angles, viewLeaf);
     }