From 5f92f7182311b111a1bb9ac2f3bccb9eb5754c2c Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Thu, 21 Apr 2022 20:59:43 +0800
Subject: Bugfix: vec3::refract assertion fails in complex scenarios. Use
 looser accuracy requirement.

---
 vec.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vec.h b/vec.h
index 11b9bd3..c109f7c 100644
--- a/vec.h
+++ b/vec.h
@@ -131,8 +131,8 @@ struct vec3 {
     // If TIR happens, the ray will be reflected.
     template<bool Enable_TIR>
     vec3 refract(const vec3 &r1, double ri_inv) const {
-        assert(fabs(mod2() - 1.0) < 1e-12);
-        assert(fabs(r1.mod2() - 1.0) < 1e-12);
+        assert(fabs(mod2() - 1.0) < 1e-7);
+        assert(fabs(r1.mod2() - 1.0) < 1e-7);
         assert(ri_inv > 0);
         assert(dot(r1) < 0); // normal vector must be on the same side
         const auto &n = *this; // normal vector
-- 
cgit v1.2.3