From 507440cdf786f7a1a83bdf22371f1844910382fb Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 5 Mar 2026 20:04:09 +0100
Subject: Fixed ordering and somehow mistaking the wrongly assumed wrong
 pressure boundary

---
 lib/core/c++/boundary.hpp    | 4 ++--
 lib/core/tests/collision.cpp | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 lib/core/tests/collision.cpp

(limited to 'lib/core')

diff --git a/lib/core/c++/boundary.hpp b/lib/core/c++/boundary.hpp
index 0a4ff4d..d5f3022 100644
--- a/lib/core/c++/boundary.hpp
+++ b/lib/core/c++/boundary.hpp
@@ -135,7 +135,7 @@ public:
 		for(saw::data<sch::UInt64> k{0u}; k < saw::data<sch::UInt64>{Descriptor::Q}; ++k){
 			auto c_k = dfi::directions[k.get()];
 
-			if(c_k[0u]*known_dir >= 0){
+			if(c_k[0u]*known_dir <= 0){
 				sum_df += dfs_old.at({k});
 			}
 		}
@@ -147,7 +147,7 @@ public:
 
 		for(saw::data<sch::UInt64> k{0u}; k < saw::data<sch::UInt64>{Descriptor::Q}; ++k){
 			auto c_k = dfi::directions[k.get()];
-			if(c_k[0u]*known_dir > 0){
+			if(c_k[0u]*known_dir < 0){
 				sum_unknown_dfs += dfs_old.at({k}) * c_k[0u];
 			}
 		}
diff --git a/lib/core/tests/collision.cpp b/lib/core/tests/collision.cpp
new file mode 100644
index 0000000..cd53336
--- /dev/null
+++ b/lib/core/tests/collision.cpp
@@ -0,0 +1,6 @@
+#include <forstio/test/suite.hpp>
+
+#include "../c++/collision.hpp"
+
+namespace {
+}
-- 
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