From 42ee05fd0e4837ca62606fab34c099e6af5baf2f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fernando=20Garc=C3=ADa=20Li=C3=B1=C3=A1n?=
 <fernandogarcialinan@gmail.com>
Date: Tue, 17 Nov 2020 12:34:03 +0100
Subject: [PATCH] Check for 0 value before doing log2

---
 simgear/scene/viewer/Compositor.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/simgear/scene/viewer/Compositor.cxx b/simgear/scene/viewer/Compositor.cxx
index 3be5bb69..c229b49a 100644
--- a/simgear/scene/viewer/Compositor.cxx
+++ b/simgear/scene/viewer/Compositor.cxx
@@ -222,7 +222,8 @@ Compositor::update(const osg::Matrix &view_matrix,
             u->set(osg::Vec3f(-zFar, -zFar * zNear, zFar - zNear));
             break;
         case FCOEF:
-            u->set(2.0f / log2(float(zFar) + 1.0f));
+            if (zFar != 0.0)
+                u->set(2.0f / log2(float(zFar) + 1.0f));
             break;
         default:
             // Unknown uniform