From 1f960e3726a4cc55718c5d75a7a2b8082c6d24db Mon Sep 17 00:00:00 2001
From: numzero <numzer0@yandex.ru>
Date: Sun, 9 Jun 2024 22:05:51 +0300
Subject: [PATCH] Improve precision

That thing is divided by, so better make it a power of two to make the division exact.
---
 src/bin/flat.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bin/flat.rs b/src/bin/flat.rs
index 6f7a7ae..692e708 100644
--- a/src/bin/flat.rs
+++ b/src/bin/flat.rs
@@ -637,7 +637,7 @@ mod riemann {
 		}
 
 		fn part_derivs_at(&self, pos: Vec2) -> Tens2 {
-			part_deriv(|p| self.at(p), pos, 1.0e-3)
+			part_deriv(|p| self.at(p), pos, 1.0 / 1024.0) // division by such eps is exact which is good for overall precision
 		}
 
 		fn vec_length_at(&self, at: Vec2, v: Vec2) -> f32 {