The Magnet Toy
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THE ELECTRIC-MAGNET TOY — Classical Electromagnetism for The Powder Toy======================================================================By netherpro
Windows: https://starcatcher.us/TPT/mods/The-Magnet-Toy/The-Magnet-Toy.zip
macOS: https://starcatcher.us/TPT/mods/The-Magnet-Toy/The-Magnet-Toy.dmg
Linux: https://starcatcher.us/TPT/mods/The-Magnet-Toy/The-Magnet-Toy%20linux64.zipWHY I MADE THIS----------------------------------------------------------------------The Powder Toy dev team once rejected magnetic fields:"Realistic magnets must simulate a magnetic field with poles.It is unclear if this is doable in a simulation like Powder Toy.What is absolutely rejected is just making a copy+paste of NewtonianGravity and making it only apply to metallic powders. This is boringand uninteresting."I read this and thought: challenge accepted.This is not a copy-paste of Newtonian gravity. It is a full classicalelectromagnetism simulation with FFT-based Poisson field solvers, realphysical coupling between electric and magnetic phenomena. If theofficial game won't do it, the modding community will.WHAT IT DOES----------------------------------------------------------------------Magnetic Fields- FFT field solver: real-time Poisson equation in frequency domain(3x zero-padded, fftw3f)- Permanent magnets (MAGN), electromagnets (ELMG), monopoles (MGPN)- 13 conductors detect changing flux and spark (Faraday induction)- 4 ferromagnetics become magnetized by contact with internal diffusion- B-field breakage: strong fields shatter BMTL into BRMTElectric Fields- Second FFT solver (ElecFFT) for electric potential- Electrode plates (POSC): single element, temp polarity- Fixed charges (FIXC): persistent charge sources- 24 conductors accept charge from POSC, FIXC, ELEC, PROT- Charge diffusion between neighbors: a charged wire charges the wholecircuitElectro-Magnetic Coupling- Coulomb force: F = -q * grad(V), matching ELEC/PROT coefficient- Lorentz force: charged particles rotate in B-field, energy-conserving- Dielectrophoresis: uncharged conductors pulled toward stronger |E|- Gravity-weighted: light particles respond more than heavy onesTools- PMAG / NMAG: paint positive/negative magnetic field sources- PELC / NELC: paint positive/negative electric field sources- Sidebar toggle buttons for all field displaysTECHNICAL NOTES----------------------------------------------------------------------Both MagFFT and ElecFFT solve the Poisson equation in frequency domain:laplacian(phi) = -source --> phi_hat(k) = source_hat(k) / (k^2 + 1)Using a 3x zero-padded grid to eliminate wraparound artifacts. Sameapproach used in real computational physics, adapted for a cellularautomaton.This is not Newtonian gravity repurposed. It is a genuine electromagneticfield simulation with divergence-free magnetic fields, scalar electricpotential with proper gradient forces, Lorentz coupling, and Faradayinduction.LINKS----------------------------------------------------------------------Source Code: https://github.com/T307-coder/The-Magnet-ToyBranch: the-electric-magnet-toyLicense: GPLv3 (inherited from TPT)BUILD IT YOURSELF----------------------------------------------------------------------cd The-Magnet-Toygit checkout the-electric-magnet-toymeson setup build-static -Dstatic=prebuilt --buildtype=releaseninja -C build-staticRequires: fftw3f, meson, ninja, MSVC or GCC.It turns out realistic electromagnetism IS doablein The Powder Toy. And it's anything but boring.Edited 5 times by netherpro. Last: 31st May -
actually really impressive
i'll check it out when i have the time
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The newer version can be downloaded from github release with a more stable menu Release v.1.8.0 · T307-coder/The-Magnet-Toy
