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Spread a virus in voxel.js


Spread a virus in voxel.js.

Might make a good base for a fire or water module as well ;)


View this example

// create a virus 
var virus = require('voxel-virus')({
  // pass a copy of the game 
  game: game,
  // which material index of virus 
  // can use a material name instead, ie 'obsidian' 
  // or false to not change the material 
  material: 0,
  // how fast in milliseconds to spread 
  rate: 3000,
  // how many iterations before dying 
  // set to 0 to never decay (and eventually crash your game) 
  decay: 10,
  // how virulent; between 0 and 1 
  // 0 wont spread 
  // 1 spreads to all surrounding blocks 
  virulence: 0.5,
  // how it spreads 
  // by default it will remove the block 
  // and spread to surrounding blocks 
  how: function(block) {
    var self = this;
    if (self.decay > 0) level++;, 0);
    self.around(block).forEach(function(b) {
      self.infect(b, level);
// on fire, infect block 
game.on('fire', function() {
  var vec = game.cameraVector();
  var pos = game.cameraPosition();
  virus.infect(game.raycast(pos, vec, 100).voxel);
// on tick, spread the virus 
game.on('tick', virus.tick.bind(virus));


Set block to position of block [0, 0, 0] to infect. level is the current number of iteration the infection is on.

To infect the block you're looking at:

game.on('fire', function() {
  var vec = game.cameraVector();
  var pos = game.cameraPosition();
  virus.infect(game.raycast(pos, vec, 100).voxel);

Push the iterations forward. Needs to be added to the game tick to keep in time with the game simulation.

game.on('tick', virus.tick.bind(virus));

Returns block positions around the given block. Uses virus.virulence to randomly not select blocks.

var around = virus.around([0, 0, 0]);
// around equals an array of blocks up, down, left, right, front and back 

An array of blocks that are currently infected with time or iteration prepended.

virus.infected = [
  [time, block],
  [time, block],
  // ... 


With npm do:

npm install voxel-virus

Use browserify to require('voxel-virus').

  • 0.2.1 - update for voxel-engine@0.17
  • 0.2.0 - infect doesnt default to the block you're looking at
  • 0.1.1 - update for voxel-engine@0.16.3. infect doesnt ignore air voxels.
  • 0.1.0 - initial release

Copyright (c) 2013 Kyle Robinson Young
Licensed under the MIT license.