From b5d8593b9a2f0f58cb228444dcd09a2c5002e039 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 21 May 2026 15:00:09 +0200
Subject: Prep for proper com in circle group

---
 lib/core/c++/math/n_linear.hpp     |  3 +++
 lib/core/c++/particle/particle.hpp | 14 +++++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/core/c++/math/n_linear.hpp b/lib/core/c++/math/n_linear.hpp
index 8fb0600..b378440 100644
--- a/lib/core/c++/math/n_linear.hpp
+++ b/lib/core/c++/math/n_linear.hpp
@@ -122,6 +122,9 @@ auto n_linear_interpolate(
 		}
 
 	}, {}, ones_ind);
+
+	/// TODO I need to actually calc stuff
+	return field.at({});
 }
 
 template<typename FieldSchema, typename T>
diff --git a/lib/core/c++/particle/particle.hpp b/lib/core/c++/particle/particle.hpp
index 01429b2..5110893 100644
--- a/lib/core/c++/particle/particle.hpp
+++ b/lib/core/c++/particle/particle.hpp
@@ -55,6 +55,8 @@ template<typename T, uint64_t D, typename CollisionType = ParticleCollisionSpher
 using ParticleGroup = Struct<
 	Member<Array<T,D>, "mask">,
 	Member<FixedArray<Scalar<T>,1u>, "density">,
+	Member<Vector<T,D>, "center_of_mass">,
+	Member<Scalar<T>, "total_mass">,
 	Member<Array<Particle<T,D>>, "particles">
 >;
 }
@@ -76,10 +78,20 @@ 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> dia_d{radius*2};
+	mask_step.at({}) = dia_d / mask_resolution.template cast_to<T>();
 
 	mask = {mask_dims};
+
+	auto& com = part.template get<"center_of_mass">();
+	for(uint64_t i = 0u; i < D; ++i){
+		com.at({{i}}) = {};
+	}
+	saw::data<sch::UInt64> ele_ctr{0u};
 	iterator<D>::apply([&](const auto& index){
-		
+		++ele_ctr;
+
 	},{},mask_dims);
 
 	return part;
-- 
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