From 7a7d681ce70133ef0bc47a701f5b8448b15b3a29 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sun, 28 Jun 2026 19:17:52 +0200
Subject: Dangling

---
 default.nix                                          |  5 +++++
 .../poiseulle_moving_particle_2d_psm_gpu/SConscript  |  2 +-
 .../poiseulle_moving_particle_2d_psm_gpu/sim.cpp     |  2 +-
 lib/core/c++/particle/particle.hpp                   |  1 +
 lib/core/c++/particle/particle_opa.hpp               | 20 ++++++++++++++++++--
 5 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/default.nix b/default.nix
index 29f4ba4..dc75b57 100644
--- a/default.nix
+++ b/default.nix
@@ -151,6 +151,11 @@ in rec {
 			inherit pname version stdenv forstio adaptive-cpp;
 			inherit kel;
 		};
+		
+		poiseulle_moving_particle_2d_psm_gpu = pkgs.callPackage ./examples/poiseulle_moving_particle_2d_psm_gpu/.nix/derivation.nix {
+			inherit pname version stdenv forstio adaptive-cpp;
+			inherit kel;
+		};
 
 		poiseulle_particles_2d_gpu = pkgs.callPackage ./examples/poiseulle_particles_2d_gpu/.nix/derivation.nix {
 			inherit pname version stdenv forstio adaptive-cpp;
diff --git a/examples/poiseulle_moving_particle_2d_psm_gpu/SConscript b/examples/poiseulle_moving_particle_2d_psm_gpu/SConscript
index eb856b6..b062091 100644
--- a/examples/poiseulle_moving_particle_2d_psm_gpu/SConscript
+++ b/examples/poiseulle_moving_particle_2d_psm_gpu/SConscript
@@ -23,7 +23,7 @@ env.headers += examples_env.headers;
 # Cavity2D
 examples_objects = [];
 examples_env.add_source_files(examples_objects, ['sim.cpp'], shared=False);
-examples_env.poiseulle_2d_gpu = examples_env.Program('#bin/poiseulle_particles_2d_psm_gpu', [examples_objects]);
+examples_env.poiseulle_2d_gpu = examples_env.Program('#bin/poiseulle_moving_particle_2d_psm_gpu', [examples_objects]);
 
 # Set Alias
 env.examples = [
diff --git a/examples/poiseulle_moving_particle_2d_psm_gpu/sim.cpp b/examples/poiseulle_moving_particle_2d_psm_gpu/sim.cpp
index 3001ba9..0c10d38 100644
--- a/examples/poiseulle_moving_particle_2d_psm_gpu/sim.cpp
+++ b/examples/poiseulle_moving_particle_2d_psm_gpu/sim.cpp
@@ -199,7 +199,7 @@ saw::error_or<void> step(
 		component<T,Desc,cmpt::ZouHeHorizontal<true>,encode::Sycl<saw::encode::Native>> flow_in{1.0};
 		component<T,Desc,cmpt::ZouHeHorizontal<false>,encode::Sycl<saw::encode::Native>> flow_out{1.0};
 
-		component<T,Desc,cmpt::OneParticleAt, encode::Sycl<saw::encode::Native>> opa;
+		component<T,Desc,cmpt::OneParticleAt, encode::Sycl<saw::encode::Native>> opa{{},{}};
 
 		h.parallel_for(acpp::sycl::range<Desc::D>{dim_x,dim_y}, [=](acpp::sycl::id<Desc::D> idx){
 			saw::data<sch::FixedArray<sch::UInt64,Desc::D>> index;
diff --git a/lib/core/c++/particle/particle.hpp b/lib/core/c++/particle/particle.hpp
index 13ed37b..8e75e5a 100644
--- a/lib/core/c++/particle/particle.hpp
+++ b/lib/core/c++/particle/particle.hpp
@@ -8,6 +8,7 @@
 
 #include "schema.hpp"
 #include "aabb.hpp"
+#include "particle_opa.hpp"
 
 namespace kel {
 namespace lbm {
diff --git a/lib/core/c++/particle/particle_opa.hpp b/lib/core/c++/particle/particle_opa.hpp
index 470c4e9..4588a55 100644
--- a/lib/core/c++/particle/particle_opa.hpp
+++ b/lib/core/c++/particle/particle_opa.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
-#include "component.hpp"
+#include "common.hpp"
+#include "../component.hpp"
 
 namespace kel {
 namespace lbm {
@@ -12,8 +13,19 @@ template<typename T, typename Descriptor, typename Encode>
 
 class component<T,Descriptor,cmpt::OneParticleAt, Encode> final {
 private:
+	saw::data<sch::Vector<T,Descriptor::D>> pos_;
+	saw::data<sch::Scalar<T>> rad_;
+	saw::data<sch::Scalar<T>> eps_;
 public:
-	component() = default;
+	component(
+		const saw::data<sch::Vector<T,Descriptor::D>> pos__,
+		const saw::data<sch::Scalar<T>> rad__,
+		const saw::data<sch::Scalar<T>> eps__
+	):
+		pos_{pos__},
+		rad_{rad__},
+		eps_{eps__}
+	{}
 
 	template<typename MacroFieldSchema>
 	void apply(const saw::data<MacroFieldSchema, Encode>& macros, const saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> index, saw::data<sch::UInt64> time_step) const {
@@ -24,6 +36,10 @@ public:
 		auto& porous = porous_f.at(index);
 
 
+		auto pos_ind = saw::math::vectorize_data(index);
+
+		auto diff = pos_ind - pos_;
+		auto diff_dot = saw::math::dot(diff,diff);
 	}
 };
 }
-- 
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