From 2a5261cd719547686f283b2aeae004b589b69e32 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Fri, 20 Mar 2026 18:23:39 +0100
Subject: Fraction and downcast looks ok. Need upper bound now

---
 lib/core/c++/math/n_linear.hpp | 2 +-
 lib/core/tests/math.cpp        | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

(limited to 'lib/core')

diff --git a/lib/core/c++/math/n_linear.hpp b/lib/core/c++/math/n_linear.hpp
index bb7653c..ac02da8 100644
--- a/lib/core/c++/math/n_linear.hpp
+++ b/lib/core/c++/math/n_linear.hpp
@@ -33,7 +33,7 @@ saw::data<sch::Tuple<sch::Vector<sch::UInt64,D>,sch::Vector<T,D>>> position_to_i
 		ind.at({{i}}) = pos_cpy.at({{i}}).template cast_to<sch::UInt64>();
 	}
 
-	frac = pos - ind.template cast_to<T>();
+	frac = pos_cpy - ind.template cast_to<T>();
 
 	return sep;
 }
diff --git a/lib/core/tests/math.cpp b/lib/core/tests/math.cpp
index 7c9dc14..970004b 100644
--- a/lib/core/tests/math.cpp
+++ b/lib/core/tests/math.cpp
@@ -30,11 +30,17 @@ SAW_TEST("Math/Floor Index from Pos"){
 		pos.at({{1u}}) = -50.0;
 	}
 
-	auto ind = lbm::floor_index_from_position(pos);
+	auto ind_frac = lbm::position_to_index_and_fraction(pos);
+	auto& ind = ind_frac.template get<0u>();
 	for(uint64_t i = 0u; i < 2u; ++i){
 		std::cout<<ind.at({{i}}).get()<<" ";
 	}
 	std::cout<<std::endl;
+	auto& frac = ind_frac.template get<1u>();
+	for(uint64_t i = 0u; i < 2u; ++i){
+		std::cout<<frac.at({{i}}).get()<<" ";
+	}
+	std::cout<<std::endl;
 
 	SAW_EXPECT(true, "Default true check");
 }
-- 
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