Do You Like Physics Simulations aaaannnd C++? Me Too!
summary
Ports Matthias Müller’s JavaScript fluid demo into C++ using CMake, MSVC and an OpenGL widget, ends up running about 21,000 particles on a laptop after fixing Y‑axis and scale bugs and converting JS reference semantics to C++ references. Implements C++23 modules, replaces flat arrays with mdspan, rewrites loops into ranges and tests parallel execution for drawing vs simulation, finding drawing parallelizes well but math-bound simulation limits speed. Adds sand and floating material by changing densities, uses consteval/if consteval for compile‑time tuning.
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chapters (18)
- 0:00Introduction and goals
- 3:36Fluid physics foundation
- 6:23Translating JS to C++
- 8:24Modernizing with ranges
- 10:03Using MDspan for data
- 11:50Fixing simulation bugs
- 14:18Advanced range techniques
- 16:48String formatting and scaling
- 19:12Fixing physics and references
- 22:18Implementing C++ modules
- 25:47Module structure and cycles
- 28:38Refactoring into modules
- 31:10Simulation loop breakdown
- 34:01Parallel algorithms
- 37:11Compile-time optimizations
- 39:22Graphics rendering optimization
- 42:26Adding materials and analysis
- 45:46Conclusion and takeaways
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