From 8d20d61b4d305b985de4837bb0ed3ddaedb208d1 Mon Sep 17 00:00:00 2001
From: Brad Linden <brad@lindenlab.com>
Date: Wed, 31 May 2023 10:33:03 -0700
Subject: Fix divide by zero causing NaN with certain day cycles in DRTVWR-559

---
 indra/newview/llenvironment.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'indra/newview/llenvironment.cpp')

diff --git a/indra/newview/llenvironment.cpp b/indra/newview/llenvironment.cpp
index aec7ceaa3c..58da164b5a 100644
--- a/indra/newview/llenvironment.cpp
+++ b/indra/newview/llenvironment.cpp
@@ -168,6 +168,9 @@ namespace
     // Find normalized track position of given time along full length of cycle
     inline LLSettingsBase::TrackPosition convert_time_to_position(const LLSettingsBase::Seconds& time, const LLSettingsBase::Seconds& len)
     {
+        // early out to avoid divide by zero.  if len is zero then jump to end position
+        if (len == 0.f) return 1.f;
+
         LLSettingsBase::TrackPosition position = LLSettingsBase::TrackPosition(fmod((F64)time, (F64)len) / (F64)len);
         return llclamp(position, 0.0f, 1.0f);
     }
-- 
cgit v1.2.3