Introduction

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This is going to be my blog for the project part in the course DH2323. I will probably make a project involving collision detection between a shape and an uneven surface, perhaps best described as a set of connected triangles. I have not figured out the details of what I plan to do exactly, but besides solving a general problem statement, I also want to create a program that enables me to demonstrate it properly. I will probably use C++ and GLFW as well as GLM.

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Collisions

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I consider this project to be more or less done now. The last thing I implemented was a way to reduce the amount of collision checks. If one does a naive solution, then all particles gets checked against all particles resulting in a O(n^2) solution. This quickly escalates already for only 3 objects in my expiremts such that it becomes infeasible. So what I did was to read online and most recommended using a 3D uniform grid for the particles. Such that each particle inside a grid voxel was checked only against particles within the voxel itself and adjacent voxels. One powerpoint I found online suggested using a hashmap and only store voxel IDs that are used, otherwise one would have to allocate a huge chunk of memory of a finite amount of space. I could not find that powerpoint again but I'm glad that I remembered this idea. In my solution I ended up using std::map instead which internally has a red-black tree. I used this as it is more reliable, a hash solution can in worst case ...
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Initial Plan

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So I have a plan for how I want to do this project. The goal is to be at least 90% done by the 1st of august 2019. The first thing to do is to setup a scene by which I can demonstrate my solution. None of the scene setup is that relevant to the project per se, but having good visuals are impressive for both graders and potential employers in the future. So what needs to be done is to setup my work environent using Visual Studio and GLFW. I have done this earlier so there may already be such a work environment readily available on my PC somewhere. I think that I also have Lua setup on that environment, which may be useful for making real-time changes to the code, instead of having to recompile a lot of times. I believe it was a good thing to try to create a rigid body simulation first. I will also do the course "Advanced Graphics and Interaction" as well as a master thesis later on related to graphics and interaction. To me this topic seems like it can provide a solid founda...
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Particle Generation

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I know there has been a long time since I did any updates, and I am behind my made up schedule for this project. The good news is though that I have managed to create C++ code for generating particles. Given a mesh, which I read from an OBJ-file, I take all the vertices making up the triangles and use these to generate particles on the CPU. I found inspiration for my own solution by the short amount of text described on GPU-Gems 3 chapter 29. GPU-Gems mainly focused on a solution that generated particles with the GPU and Cuda (which only NVIDIA graphics cards can use). Since I am not used to graphics programming, don't have a NVIDIA graphics card on my laptop, and want the code to work on any computer, I decided to generate the particles using normal C++ code. I sort of got stuck on how to generate particles, since I had some bugs in my code. But after discovering and fixing these bugs I got much better result. I know that I haven't explained HOW yet, but here is a short expl...
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