From 9e78f3d936c95b6add1d097f957e5a770beac813 Mon Sep 17 00:00:00 2001
From: AnyOldName3 <krizdjali+github@gmail.com>
Date: Sat, 3 Oct 2020 02:19:38 +0100
Subject: [PATCH] Skip raycasting for zero-length rays

Rays with no length can't intersect anything. This also prevents an
assertion triggering with Bullet built in Debug mode.
---
 apps/openmw/mwphysics/physicssystem.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/apps/openmw/mwphysics/physicssystem.cpp b/apps/openmw/mwphysics/physicssystem.cpp
index 91e7a9de0d..8b07fea4b2 100644
--- a/apps/openmw/mwphysics/physicssystem.cpp
+++ b/apps/openmw/mwphysics/physicssystem.cpp
@@ -264,6 +264,8 @@ namespace MWPhysics
 
     RayCastingResult PhysicsSystem::castRay(const osg::Vec3f &from, const osg::Vec3f &to, const MWWorld::ConstPtr& ignore, std::vector<MWWorld::Ptr> targets, int mask, int group) const
     {
+        if (from == to)
+            return RayCastingResult { false };
         btVector3 btFrom = Misc::Convert::toBullet(from);
         btVector3 btTo = Misc::Convert::toBullet(to);