From 9c5c34e82d6264250657dcbf166fbcd929027d27 Mon Sep 17 00:00:00 2001
From: Thorsten Renk <thorsten.i.renk@jyu.fi>
Date: Wed, 13 Aug 2014 10:52:59 +0300
Subject: [PATCH] Directional dependence of intensity for lights, work in
 progress

---
 Shaders/surface-light-lightfield.vert | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Shaders/surface-light-lightfield.vert b/Shaders/surface-light-lightfield.vert
index 6d90cb8f0..6940b7280 100644
--- a/Shaders/surface-light-lightfield.vert
+++ b/Shaders/surface-light-lightfield.vert
@@ -20,7 +20,12 @@ void main()
     relPos = gl_Vertex.xyz - ep.xyz;
     rawPos = gl_Vertex.xy;
     float dist = length(relPos);
-    float lightScale = size * size * size * size * size/ 500.0;
-    pixelSize = min(size * size/25.0,lightScale/dist);
+    float angular_fade = 0.0;
+    if (length(gl_Normal)> 0.0)
+	{
+	angular_fade = 2.0 * max(0.0,-dot(normalize(gl_Normal), normalize(relPos)));
+	}
+    float lightScale = size * size * size * size * size/ 500.0 *angular_fade;
+    pixelSize = min(size * size/25.0,lightScale/dist) ;
     gl_PointSize = 2.0 * pixelSize;
 }