From 434d18d0317a62fe85304c48baf419a21f120462 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 22 Sep 2025 16:39:52 +0200
Subject: Different force exchange on collision

---
 examples/poiseulle_particles_channel_2d.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/examples/poiseulle_particles_channel_2d.cpp b/examples/poiseulle_particles_channel_2d.cpp
index f098ca0..a9146e8 100644
--- a/examples/poiseulle_particles_channel_2d.cpp
+++ b/examples/poiseulle_particles_channel_2d.cpp
@@ -5,7 +5,7 @@
 #include "../c++/particle/geometry/circle.hpp"
 
 #include <forstio/codec/data.hpp>
-#include <forstio/codec/data_math.hpp>
+#include <forstio/codec/math.hpp>
 
 #include <cmath>
 
@@ -347,6 +347,10 @@ void couple_particles_to_lattice(
 			p_cell_pos.at({{0u}}).set(std::max(1ul, std::min(p_cell_pos.at({{0u}}).get(), meta.at({0u}).get()-2ul)));
 			p_cell_pos.at({{1u}}).set(std::max(1ul, std::min(p_cell_pos.at({{1u}}).get(), meta.at({1u}).get()-2ul)));
 
+			saw::data<sch::Vector<sch::UInt64,2u>> p_vec_cell_pos;
+			p_vec_cell_pos.at({{0u}}) = p_cell_pos.at({0u});
+			p_vec_cell_pos.at({{1u}}) = p_cell_pos.at({1u});
+
 			// Interpolate this from close U cells.
 			// For now pick the closest U
 			auto& closest_u = macros.at(p_cell_pos).template get<"velocity">();
@@ -372,7 +376,7 @@ void couple_particles_to_lattice(
 			auto& p_info = cell.template get<"info">()({0u});
 			if(p_info.get() <= 1u){
 				// Fake solid normal
-				auto solid_normal = p_pos - p_cell_pos;
+				auto solid_normal = p_pos - p_vec_cell_pos.template cast_to<sch::T>();
 				solid_normal = saw::math::normalize(solid_normal);
 				auto v_n = saw::math::dot(solid_normal,p_vel);
 
-- 
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