- Lets try fixing the extra tic issue by evaluating the zero delay states at PostBeginPlay. This requires delaying the state cycling until the next tick.

SVN r4234 (trunk)

src/p_mobj.cpp

@@ -3498,29 +3498,21 @@ void AActor::Tick ()
 	// cycle through states, calling action functions at transitions
 	if (tics != -1)
 	{
-		// you can cycle through multiple states in a tic
-		// [BL] If we reach here with a 0 duration state, we
-		// have created an extra tic, so account for it.
-		int newtics;
-		do
+		// [RH] Use tics <= 0 instead of == 0 so that spawnstates
+		// of 0 tics work as expected.
+		if (tics <= 0)
 		{
-			newtics = --tics;
-
-			// [RH] Use tics <= 0 instead of == 0 so that spawnstates
-			// of 0 tics work as expected.
-			if (tics <= 0)
+			assert (state != NULL);
+			if (state == NULL)
 			{
-				assert (state != NULL);
-				if (state == NULL)
-				{
-					Destroy();
-					return;
-				}
-				if (!SetState (state->GetNextState()))
-					return; 		// freed itself
+				Destroy();
+				return;
 			}
+			if (!SetState (state->GetNextState()))
+				return; 		// freed itself
 		}
-		while (newtics < 0 && tics != -1);
+
+		tics--;
 	}
 	else
 	{
@@ -3991,6 +3983,13 @@ void AActor::PostBeginPlay ()
 		Renderer->StateChanged(this);
 	}
 	PrevAngle = angle;
+
+	// [BL] Run zero-delay spawn states now so that we don't create a tic later
+	if(tics == 0 && state)
+	{
+		if (!SetState (state->GetNextState()))
+			return; 		// freed itself
+	}
 }
 
 void AActor::MarkPrecacheSounds() const