Hackrender in its current form is a conglomeration of animation methods that will eventually be merged to be used a 3D Nethack game.
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Particle Engine
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Newtonian Mechanics
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Cloth Simulation, avoids intersections / self-collisions and twisting on itself.
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Crowd Simulation with agents that motion plan towards a goal in a randomized environment.
A preview of the particle engine is below:
Some animations of the cloth sim:
Animations to demonstrate Boids crowd simulation and the search algorithm:




