gitter-badger/simple-raytracer

simple-raytracer works as a standalone version of the JS raytracer found in distracer.io, which was inspired by jsRayTracer. It's purpose is to offer a simple raytracing interface that can be run locally in, in a distributed fashion on a server or even in browsers

simple-raytracer

simple-raytracer works as a standalone version of the JS raytracer found in distracer.io, which was inspired by jsRayTracer. It's purpose is to offer a simple raytracing interface that can be run locally in, in a distributed fashion on a server or even in browsers

Badgers

Description

API

Example local

var fs = require('fs');
var srt = require('simple-raytracer');
var Png = require('png').Png;

var N_SPLIT = 50; // The number of tasks will be N_SPLIT * N_SPLIT
var SCENE_PATH = './example-scenes/pokeball.rt'; // The scene configuration to be processed

// Parse and load the scene configuration
var scene = srt.prepareScene(SCENE_PATH);

// Create the tasks that are going to be executed, depending on the scene size and N_SPLIT
var tasks = srt.prepareTasks({
  split: N_SPLIT, /* Number of tasks the job is going to be divided into */
  width: scene.global.width,
  height: scene.global.height
});


// Execute a RayTrace for every single Task
var results = tasks.map(function(task) {
  return {
    begin_x: task.begin_x,
    end_x: task.end_x,
    begin_y: task.begin_y,
    end_y: task.end_y,
    animation: task.animation,
    data: srt.runTask(scene, task).data
  };
});

// Construct the image into a buffer 
var rgb = new Buffer(scene.global.width * scene.global.height * 3);

results.map(function (el) {
  var i = 0;
  for(var y = el.begin_y; y < el.end_y; y++) {
    for(var x = el.begin_x; x < el.end_x; x++) {
      var z = (x * scene.global.width + y) * 3;
      rgb[z] = el.data[i++];
      rgb[z+1] = el.data[i++];
      rgb[z+2] = el.data[i++];
    }
  }
});

// Print out an PNG from the RayTraced Image
var png = new Png(rgb, scene.global.width, scene.global.height, 'rgb');
fs.writeFileSync('./out.png', png.encodeSync());

Example browser with browserify

Acknowledgements

Thank you to Diogo Cunha and Pierre Ozoux for creating distracer.io that lead to the creation of this module and Igor Soarez for reviewing and helping me solve a gnarly bug :)