From 0f7d09a35eaf85615d2acd2df370a4f230eb9890 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Mon, 12 Oct 2015 00:24:43 +0200
Subject: [PATCH] Make the fade look maybe a tad more natural.

---
 theme.lua | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/theme.lua b/theme.lua
index 8e433e2..b9d0b5b 100644
--- a/theme.lua
+++ b/theme.lua
@@ -273,6 +273,11 @@ function get_chain(num, t, width, height)
 
 				tt = fade_src + tt * (fade_dst - fade_src)
 
+				-- Make the fade look maybe a tad more natural, by pumping it
+				-- through a sigmoid function.
+				tt = 10.0 * tt - 5.0
+				tt = 1.0 / (1.0 + math.exp(-tt))
+
 				fade_chain_mix_effect:set_float("strength_first", tt)
 				fade_chain_mix_effect:set_float("strength_second", 1.0 - tt)
 			end
-- 
2.39.2