From 6aa27007996656da995088aabecc273abd97db4b Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Wed, 7 Jan 2026 17:57:52 +0100
Subject: More part collision tests

---
 default.nix                              | 5 +++--
 examples/particles_gpu/particles_gpu.cpp | 8 +++++---
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/default.nix b/default.nix
index f418d0e..2c76e6b 100644
--- a/default.nix
+++ b/default.nix
@@ -1,8 +1,9 @@
 { pkgs ? import (builtins.fetchTarball{
 	url = "https://github.com/NixOS/nixpkgs/archive/nixos-25.11.tar.gz";
 }) {}
-, stdenv ? pkgs.llvmPackages_19.stdenv
-, clang-tools ? pkgs.clang-tools_19
+, llvmPackages ? pkgs.llvmPackages_19
+, stdenv ? llvmPackages.stdenv
+, clang-tools ? llvmPackages.clang-tools
 }:
 
 let
diff --git a/examples/particles_gpu/particles_gpu.cpp b/examples/particles_gpu/particles_gpu.cpp
index baae5f3..2f2d691 100644
--- a/examples/particles_gpu/particles_gpu.cpp
+++ b/examples/particles_gpu/particles_gpu.cpp
@@ -33,7 +33,7 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 			auto& p_size = part.template get<"size">();
 			p_size = {0.5f};
 
-			if(j.get() % 2u == 0) acceleration.at({{1u}}) = {-9.81};
+			if(j.get() % 2u == 0) acceleration.at({{1u}}) = {9.81};
 
 			pos.at({{0u}}) = {i.template cast_to<sch::Float32>()};
 			pos.at({{1u}}) = {j.template cast_to<sch::Float32>()};
@@ -42,11 +42,11 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 		}
 	}
 
-	for(saw::data<sch::UInt64> dt{0u}; dt < saw::data<sch::UInt64>{1024ul*32ul}; ++dt){
+	for(saw::data<sch::UInt64> dt{0u}; dt < saw::data<sch::UInt64>{32ul}; ++dt){
 		for(saw::data<sch::UInt64> i{0u}; i < particles.size(); ++i){
 			auto& part_i = particles.at(i);
 
-			verlet_step_lambda<sch::Float32,2u>(part_i,{1.0f});
+			verlet_step_lambda<sch::Float32,2u>(part_i,{0.05f});
 		}
 		for(saw::data<sch::UInt64> i{0u}; i < particles.size(); ++i){
 			auto& part_i = particles.at(i);
@@ -59,6 +59,8 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 				}
 			}
 		}
+		auto& pos = particles.at({0u}).template get<"rigid_body">().template get<"position">();
+		std::cout<<pos.at({{0u}}).get()<<" "<<pos.at({{1u}}).get()<<std::endl;
 
 		saw::codec<sch::Array<sch::Particle<sch::Float32,2u>>, saw::encode::Json> j_codec;
 	}
-- 
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