The Nucleon
The Mathematical Model
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Unity Official Tutorial: https://unity3d.com/learn/tutorials/topics/graphics/gentle-introduction-shaders
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Taras Leskiv: https://unity3d-shader-programming.zeef.com/taras.leskiv
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And more: https://github.com/antoinefournier/XParticle
https://github.com/antoinefournier/XParticle
https://github.com/sugi-cho/Unity-GPU-Particle
https://cgcookie.com/course/fundamentals-of-particle-systems/