From ae7574483edbf569cbbf7d9cf7bc01720b8f69c9 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Wed, 14 Sep 2022 18:30:12 +0200
Subject: [PATCH] slr:: formula_exp now returns 0 for vel==0 instead of nan

---
 nonisotropic.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nonisotropic.cpp b/nonisotropic.cpp
index a72e6d1e..214693e3 100644
--- a/nonisotropic.cpp
+++ b/nonisotropic.cpp
@@ -2261,7 +2261,9 @@ EX namespace rots {
 
   EX hyperpoint formula_exp(hyperpoint vel) {
     bool sp = sphere;
-    ld K = sp ? 1 : -1;    
+    ld K = sp ? 1 : -1;
+
+    if(vel[0] == 0 && vel[1] == 0 && vel[2] == 0) return C0;
   
     ld len = hypot_d(3, vel);