https://rednuht.org/genetic_cars_2/

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[View top replay]
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[Save Population] [Restore Saved Population] [Surprise!]
[New Population] [Fast Forward]
Create new world with seed
[                    ] [Go!]

Generation     
Cars alive     
Distance       
Height         
Mutation rate: [5%  ]
Mutation size: [100%]
Floor:         [fixed  ]
Gravity:       [Earth (9.81)      ]
Elite clones:  [1 ]


[Watch Leader]

But what is it?

The program uses a simple genetic algorithm to evolve random
two-wheeled shapes into cars over generations. Loosely based on
BoxCar2D, but written from scratch, only using the same physics
engine (box2d).
seedrandom.js written by David Bau. (thanks!)

Controls

     Save      Saves current population locally.
  Population
Restore Saved  Restore a previously saved population.
  Population
   Suprise     Toggles drawing, makes the simulation faster.
New Population Keeps the generated track and restarts the whole car
               population.
  Create new   The same seed always creates the same track, so you
  world with   can agree on a seed with your friends and compete. :)
     seed
               The chance that each gene in each individual will
Mutation rate  mutate to a random value when a new generation is
               born.
Mutation size  The range each gene can mutate into. Lower numbers
               mean the gene will have values closer to the original.
 Elite clones  The top n cars that will be copied over to the next
               generation.
   View top    Pause the current simulation and show the top
    replay     performing car. Click a second time to resume
               simulation.

Graph

 Red  Top score in each generation
Green Average of the top 10 cars in each generation
Blue  Average of the entire generation

Genome

The genome consists of:

  * Shape (8 genes, 1 per vertex)
  * Wheel size (2 genes, 1 per wheel)
  * Wheel position (2 genes, 1 per wheel)
  * Wheel density (2 genes, 1 per wheel) darker wheels mean denser
    wheels
  * Chassis density (1 gene) darker body means denser chassis

Blurb

This is not as deterministic as it should be, so your best car may
not perform as well as it once did. The terrain gets more complex
with distance.
I'm not in the mood to deal with checking if all scripts have loaded
before running, so refresh the page if things seem whack.

GitHub

The code is now on a GitHub repository. Feel free to contribute!

Originally written by this guy, now with contributions from patient
people at GitHub.