From 346d979dcdea3e3f37d3ad55680b4f0469d7220c Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Wed, 27 May 2026 15:58:45 +0200
Subject: Dangliung

---
 lib/core/c++/abstract/data.hpp     |  1 +
 lib/core/c++/math/n_closest.hpp    | 24 ++++++++++++++++++++++++
 lib/core/c++/particle/particle.hpp | 16 +++++++++-------
 3 files changed, 34 insertions(+), 7 deletions(-)
 create mode 100644 lib/core/c++/math/n_closest.hpp

(limited to 'lib')

diff --git a/lib/core/c++/abstract/data.hpp b/lib/core/c++/abstract/data.hpp
index 0075718..ed23268 100644
--- a/lib/core/c++/abstract/data.hpp
+++ b/lib/core/c++/abstract/data.hpp
@@ -48,4 +48,5 @@ template<typename Sch>
 struct schema {
 	using Type = Sch;
 };
+
 }
diff --git a/lib/core/c++/math/n_closest.hpp b/lib/core/c++/math/n_closest.hpp
new file mode 100644
index 0000000..ddc89be
--- /dev/null
+++ b/lib/core/c++/math/n_closest.hpp
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "../common.hpp"
+#include "../iterator.hpp"
+
+namespace kel {
+namespace lbm {
+
+template<typename FieldSchema, typename T, uint64_t D>
+auto n_closest_read(saw::data<FieldSchema>, const saw::data<sch::Vector<T,D>>& frac_ind){
+
+	auto shift_frac_ind = frac_ind;
+	for(uint64_t i{0u}; i < D; ++i){
+		
+		shift_frac_ind.at({{i}}) = shift_frac_ind.at({{i}})  + saw::data<T>{0.5};
+		if(shift_frac_ind.at({{i}}).get() < 0){
+			shift_frac_ind.at({{i}}) = {};
+		}
+	}
+
+	auto shift_ind = frac_ind.template cast_to<sch::UInt64>();
+}
+}
+}
diff --git a/lib/core/c++/particle/particle.hpp b/lib/core/c++/particle/particle.hpp
index 5449b88..37bdc28 100644
--- a/lib/core/c++/particle/particle.hpp
+++ b/lib/core/c++/particle/particle.hpp
@@ -51,22 +51,25 @@ using Particle = Struct<
 	// Member<Array<Float64,D>, "mask">, 
 >;
 
-template<typename T, uint64_t D, typename CollisionType = ParticleCollisionSpheroid<T,2.0f>>
+template<typename T, uint64_t D, typename CollisionType = ParticleCollisionSpheroid<T>>
 using ParticleGroup = Struct<
 	Member<Array<T,D>, "mask">,
+	Member<FixedArray<Scalar<T>,1u>, "mask_step">,
 	Member<FixedArray<Scalar<T>,1u>, "density">,
 	Member<FixedArray<Vector<T,D>,1u>, "center_of_mass">,
 	Member<FixedArray<Scalar<T>,1u>, "total_mass">,
-	Member<Array<Particle<T,D>>, "particles">
+	Member<Array<Particle<T,D>,1u>, "particles">
 >;
 }
 
+
+
 template<typename T, uint64_t D, typename saw::native_data_type<T>::type radius>
 saw::data<sch::ParticleGroup<T,D, sch::ParticleCollisionSpheroid<T,radius>>> create_spheroid_particle_group(
 		saw::data<sch::Scalar<T>> density_p,
 		const saw::data<sch::UInt64>& mask_resolution
 ){
-	saw::data<sch::ParticleGroup<T,D,sch::ParticleCollisionSpheroid<T,2.0f>>> part;
+	saw::data<sch::ParticleGroup<T,D,sch::ParticleCollisionSpheroid<T,radius>>> part;
 
 	auto& mask = part.template get<"mask">();
 	auto& density = part.template get<"density">().at({{0u}});
@@ -82,13 +85,14 @@ saw::data<sch::ParticleGroup<T,D, sch::ParticleCollisionSpheroid<T,radius>>> cre
 	for(uint64_t i = 0u; i < D; ++i){
 		mask_dims.at({i}) = mask_resolution;
 	}
-	saw::data<sch::Scalar<T>> mask_step;
 	saw::data<T> rad_d{radius};
 	saw::data<T> dia_d = rad_d * 2;
-	mask_step.at({}) = dia_d / mask_resolution.template cast_to<T>();
 
 	mask = {mask_dims};
 
+	auto& mask_step = part.template get<"mask_step">().at({{0u}});
+	mask_step.at({}) = dia_d.at({}) / mask_resolution.template cast_to<T>();
+
 	auto& com = part.template get<"center_of_mass">().at({{0u}});
 	// Paranoia
 	for(uint64_t i = 0u; i < D; ++i){
@@ -110,8 +114,6 @@ saw::data<sch::ParticleGroup<T,D, sch::ParticleCollisionSpheroid<T,radius>>> cre
 
 		saw::data<sch::Vector<T,D>> offset_index = saw::math::vectorize_data(index).template cast_to<T>() - center;
 
-		
-
 		auto& dpi = mask.at(index);
 
 		for(uint64_t i = 0u; i < D; ++i){
-- 
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