From 2e99681cedc42749ccd98a4bd58b38581934fa52 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <c.oelckers@zdoom.fake>
Date: Sun, 27 Nov 2016 16:22:23 +0100
Subject: [PATCH] - fixed: When trying to calculate the damage for a blasted
 actor hitting another one, the velocity checks used the signed values,
 causing totally random damaging effects depending on the direction the
 objects were moving. This bug had been present in the original Hexen source
 as well.

---
 src/p_map.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/p_map.cpp b/src/p_map.cpp
index d102307bcc..475cd3569c 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -1256,7 +1256,7 @@ bool PIT_CheckThing(FMultiBlockThingsIterator &it, FMultiBlockThingsIterator::Ch
 		{
 			// ideally this should take the mass factor into account
 			thing->Vel += tm.thing->Vel.XY();
-			if ((thing->Vel.X + thing->Vel.Y) > 3.)
+			if (fabs(thing->Vel.X) + fabs(thing->Vel.Y) > 3.)
 			{
 				int newdam;
 				damage = (tm.thing->Mass / 100) + 1;