Housekeeping to support cross platform and non-CUDA

.gitignore

@@ -0,0 +1,14 @@
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+CMakeUserPresets.json
+build
+

CMakeLists.txt

@@ -1,11 +1,9 @@
 cmake_minimum_required(VERSION 3.13 FATAL_ERROR)
 
-find_package(CUDAToolkit 11 REQUIRED)
-
 project(TinyVBD LANGUAGES CXX)
 
 ## Use C++11
-set (CMAKE_CXX_STANDARD 11)
+set (CMAKE_CXX_STANDARD 17)
 find_package(Eigen3 REQUIRED)
 include_directories(${EIGEN3_INCLUDE_DIR})
 

README.md

@@ -4,10 +4,12 @@ A tiny version of VBD, focused on mass spring strand simulation.
 This code is a tiny demo of our Siggraph 2024 paper: <br />
 [Vertex Block Descent](https://arxiv.org/abs/2403.06321 "The NEXT simulator")
 
-The only dependency is Eigen3.
+The only dependency is Eigen3. https://eigen.tuxfamily.org/index.php?title=Main_Page
 
-If you compile and run it, it will output the simulation results as a series of JSON files to C:\Data\Test_20Verts_30degree_withSkip_stiffness1e8.
-You can use the VisualizeStrand.blend to convert them to obj files for visualization.
+If you compile and run it, it will output the simulation results as a series of JSON files to a subdirectory of where it is run.
+
+You can use the VisualizeStrand.blend to convert those to fbx files for visualization. This is a Blender python scripting file that is used to convert the JSON output of the program into geometry.
 
 The default configuration will run the high mass ratio experiment.
-Except for the default configuration, there are other experiment configs that you can try, all you need is to uncomment those options.
+Except for the default configuration, there are other experiment configs that you can try, all you need is to uncomment those options.
+

main.cpp

@@ -10,7 +10,12 @@
 #endif
 
 inline bool saveJson(std::string  filePath, nlohmann::json& j, int indent = -1) {
+	std::filesystem::path path(filePath);
+
+	std::filesystem::create_directories(path.parent_path());
+
 	std::ofstream ofs(filePath);
+
 	if (ofs.is_open())
 	{
 		try
@@ -120,7 +125,7 @@ struct StrandSim
 		std::vector<float> ls;
 		float m0 = 1;
 		float m1 = 1000;
-		params.outPath = "C:\\Data\\Test4_20Verts_30degree_withSkip_stiffness1e8";
+		params.outPath = "Test4_20Verts_30degree_withSkip_stiffness1e8";		// this is a multi-platform toy app, let the files land where they do
 
 		std::vector<float> ms;
 
@@ -159,7 +164,7 @@ struct StrandSim
 		bool addSkipSpring = true;
 		float skipSpringStrength = 100;
 		float tanAngle = 0.57735f; // 30 deg
-		params.outPath = "C:\\Data\\Test4_20Verts_30degree_withSkip_stiffness1e8";
+		params.outPath = "Test4_20Verts_30degree_withSkip_stiffness1e8";	// this is a multi-platform toy app, let the files land where they do
 
 		params.useAcceleration = false;
 		params.accelerationRho = 0.5;