From adc17dce1ba7488402579e4f93ddc6845170203b Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sat, 25 Jul 2020 03:14:11 +0200
Subject: [PATCH] fixed slshader when xy==0

---
 nonisotropic.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nonisotropic.cpp b/nonisotropic.cpp
index d690460c..30ec91ea 100644
--- a/nonisotropic.cpp
+++ b/nonisotropic.cpp
@@ -1942,6 +1942,8 @@ EX namespace slr {
       "float xy = length(h.xy);"
       "float phi = atan2(h[2], h[3]) + uIndexSL;"
 
+      "if(xy < 1e-6) return vec4(0.,0.,phi,1.);"
+
       "vec4 res = vec4(sqrt(-1.),sqrt(-1.),sqrt(-1.),sqrt(-1.));"
       
       "bool flipped = phi > 0.;"