From 7ad05093b8143bcae443805c71c5517628ca1bc5 Mon Sep 17 00:00:00 2001
From: Ptolemy <ptolemy@lindenlab.com>
Date: Mon, 29 Jun 2020 11:56:32 -0700
Subject: DRTVWR-497 Cleanup: Summarize calcPhi equation

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

diff --git a/indra/newview/llvowlsky.cpp b/indra/newview/llvowlsky.cpp
index 368a3f2335..d428cb1568 100644
--- a/indra/newview/llvowlsky.cpp
+++ b/indra/newview/llvowlsky.cpp
@@ -99,6 +99,9 @@ LLDrawable * LLVOWLSky::createDrawable(LLPipeline * pipeline)
 
 inline F32 LLVOWLSky::calcPhi(U32 i)
 {
+    // Calc: PI/8 * 1-((1-t^4)*(1-t^4))  { 0<t<1 }
+    // Demos: \pi/8*\left(1-((1-x^{4})*(1-x^{4}))\right)\ \left\{0<x\le1\right\}
+
 	// i should range from [0..SKY_STACKS] so t will range from [0.f .. 1.f]
 	F32 t = float(i) / float(getNumStacks());
 
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