6 files changed, 22 insertions, 18 deletions
diff --git a/modules/core/c++/hlbm.hpp b/modules/core/c++/hlbm.hpp
index 9a89697..9ddc6c6 100644
--- a/modules/core/c++/hlbm.hpp
+++ b/modules/core/c++/hlbm.hpp
@@ -125,7 +125,7 @@ public:
 		auto& mvel = macros.template get<"velocity">();
 		{
 			auto& parts = part_spheroid_group.template get<"particles">();
-			auto parts_size = parts.meta().at({0u});
+			auto parts_size = parts.dims().at({0u});
 
 			auto& pi = parts.at(index);
 			auto& pirb = pi.template get<"rigid_body">();
diff --git a/modules/core/c++/particle/aabb.hpp b/modules/core/c++/particle/aabb.hpp
index 18426d5..a838401 100644
--- a/modules/core/c++/particle/aabb.hpp
+++ b/modules/core/c++/particle/aabb.hpp
@@ -10,12 +10,12 @@ class particle_aabb final {
 	static_assert(saw::always_false<PGroup>, "Not supported");
 };
 
-template<typename T, uint64_t D>
+template<typename T, uint64_t D, uint64_t PC>
 class particle_aabb<
-	sch::ParticleGroup<T,D,coll::Spheroid<T>>
+	sch::ParticleGroup<T,D,PC,coll::Spheroid<T>>
 > final {
 public:
-	using Schema = sch::ParticleGroup<T,D,coll::Spheroid<T>>;
+	using Schema = sch::ParticleGroup<T,D,PC,coll::Spheroid<T>>;
 
 	using AABB = sch::Struct<
 		sch::Member<sch::FixedArray<sch::UInt64,D>,"a">,
@@ -23,7 +23,11 @@ public:
 	>;
 public:
 	template<typename Encode>
-	static constexpr saw::data<AABB> calculate(const saw::data<Schema,Encode>& p_grp, const saw::data<sch::FixedArray<sch::UInt64,1u>>& i, const saw::data<sch::FixedArray<sch::UInt64,D>>& meta){
+	static constexpr saw::error_or<saw::data<AABB>> calculate(const saw::data<Schema,Encode>& p_grp, const saw::data<sch::FixedArray<sch::UInt64,1u>>& i, const saw::data<sch::FixedArray<sch::UInt64,D>>& meta){
+		static_assert(PC > 0u, "Can't calculate from no particles");
+		if(not (i.at({0u}).get() < PC) ){
+			return saw::make_error<saw::err::critical>("Too large i in particle_aabb");
+		}
 
 		saw::data<AABB> aabb;
 		auto& parts = p_grp.template get<"particles">();
@@ -35,7 +39,7 @@ public:
 		auto& a = aabb.template get<"a">();
 		auto& b = aabb.template get<"b">();
 
-		const saw::data<sch::Scalar<T>>& rad_d = p_grp.template get<"collision">().at({0u}).template get<"radius">();
+		const saw::data<sch::Scalar<T>>& rad_d = p_grp.template get<"collision">().at(i).template get<"radius">();
 
 		saw::data<sch::Vector<T,D>> lower;
 		saw::data<sch::Vector<T,D>> upper;
diff --git a/modules/core/c++/particle/particle.hpp b/modules/core/c++/particle/particle.hpp
index 8e75e5a..3c3630a 100644
--- a/modules/core/c++/particle/particle.hpp
+++ b/modules/core/c++/particle/particle.hpp
@@ -13,13 +13,13 @@
 namespace kel {
 namespace lbm {
 
-template<typename T, uint64_t D>
-saw::data<sch::ParticleGroup<T,D, coll::Spheroid<T>>> create_spheroid_particle_group(
+template<typename T, uint64_t D,uint64_t PartAmount>
+saw::data<sch::ParticleGroup<T, D, PartAmount, coll::Spheroid<T>>> create_spheroid_particle_group(
 		saw::data<sch::Scalar<T>> radius_p,
 		saw::data<sch::Scalar<T>> density_p,
 		const saw::data<sch::UInt64>& mask_resolution
 ){
-	saw::data<sch::ParticleGroup<T,D,coll::Spheroid<T>>> part;
+	saw::data<sch::ParticleGroup<T,D,PartAmount,coll::Spheroid<T>>> part;
 
 	auto& rad_s = part.template get<"collision">().at({0u}).template get<"radius">();
 	rad_s = radius_p;
diff --git a/modules/core/c++/particle/particle_opa.hpp b/modules/core/c++/particle/particle_opa.hpp
index 30a8ade..ce1ecb7 100644
--- a/modules/core/c++/particle/particle_opa.hpp
+++ b/modules/core/c++/particle/particle_opa.hpp
@@ -41,7 +41,7 @@ public:
 		// Write out value
 		auto diff = pos_ind.template cast_to<T>() - pos_;
 		auto diff_dot = saw::math::dot(diff,diff);
-		porous = particle_porosity<T,Descriptor::D,por::ParticleSpheroid<T>>::calculate(diff, rad_, eps_);
+		porous = particle_porosity<T,Descriptor::D,1u,por::ParticleSpheroid<T>>::calculate(diff, rad_, eps_);
 	}
 };
 }
diff --git a/modules/core/c++/particle/porosity.hpp b/modules/core/c++/particle/porosity.hpp
index 2f39d2e..353cd58 100644
--- a/modules/core/c++/particle/porosity.hpp
+++ b/modules/core/c++/particle/porosity.hpp
@@ -11,11 +11,11 @@ template<typename T>
 struct ParticleSpheroid {};
 }
 
-template<typename T, uint64_t D, typename Coll>
+template<typename T, uint64_t D, uint64_t PC, typename Coll>
 class particle_porosity {
 public:
 
-	static saw::data<sch::Scalar<T>> calculate(const saw::data<sch::ParticleGroup<T,D,Coll>>& part_group, uint64_t p_i, const saw::data<sch::Vector<T,D>>& lbm_pos){
+	static saw::data<sch::Scalar<T>> calculate(const saw::data<sch::ParticleGroup<T,D,PC,Coll>>& part_group, uint64_t p_i, const saw::data<sch::Vector<T,D>>& lbm_pos){
 		auto& mask = part_group.template get<"mask">();
 
 		auto& particles = part_group.template get<"particles">();
@@ -33,7 +33,7 @@ public:
 };
 
 template<typename T, uint64_t D>
-class particle_porosity<T, D, por::ParticleSpheroid<T>> final {
+class particle_porosity<T, D, 1u, por::ParticleSpheroid<T>> final {
 public:
 	static saw::data<sch::Scalar<T>> calculate(const saw::data<sch::Vector<T,D>>& lbm_rel_dist, saw::data<sch::Scalar<T>> rad, saw::data<sch::Scalar<T>> eps){
 		saw::data<sch::Scalar<T>> por;
@@ -68,10 +68,10 @@ public:
 };
 
 
-template<typename T, uint64_t D>
-class particle_porosity<T, D, coll::Spheroid<T>> final {
+template<typename T, uint64_t D, uint64_t PC>
+class particle_porosity<T, D, PC, coll::Spheroid<T>> final {
 public:
-	static saw::data<sch::Scalar<T>> calculate(const saw::data<sch::ParticleGroup<T,D,coll::Spheroid<T> > >& part_group, uint64_t i, const saw::data<sch::Vector<T,D>>& lbm_pos) {
+	static saw::data<sch::Scalar<T>> calculate(const saw::data<sch::ParticleGroup<T,D,PC,coll::Spheroid<T> > >& part_group, uint64_t i, const saw::data<sch::Vector<T,D>>& lbm_pos) {
 		saw::data<sch::Scalar<T>> por;
 
 		auto& parts = part_group.template get<"particles">();
diff --git a/modules/core/c++/particle/schema.hpp b/modules/core/c++/particle/schema.hpp
index 714a16f..221137a 100644
--- a/modules/core/c++/particle/schema.hpp
+++ b/modules/core/c++/particle/schema.hpp
@@ -52,7 +52,7 @@ using Particle = Struct<
 	// Member<Array<Float64,D>, "mask">,
 >;
 
-template<typename T, uint64_t D, typename CollisionType = coll::Spheroid<T>>
+template<typename T, uint64_t D, uint64_t PartAmount, typename CollisionType = coll::Spheroid<T>>
 using ParticleGroup = Struct<
 	Member<Array<T,D>, "mask">,
 	Member<FixedArray<typename CollisionType::Schema,1u>, "collision">,
@@ -61,7 +61,7 @@ using ParticleGroup = Struct<
 	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>,1u>, "particles">
+	Member<FixedArray<Particle<T,D>,PartAmount>, "particles">
 >;
 }
 }