capturetris.js

const fs    = require('fs');
process.stdin.setEncoding('utf8');

var capturing, frame, melCode, triangles, trimatcher;
trimatcher = /<glTri>\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)\s(\-*\d+\.\d+)/
var euclidianizeVertex = function(w, x, y, z){
  return {
    x: x/w,
    y: y/w,
    z: z/w
  }
}

var initVars = function(){
  capturing = false;
  frame     = "";  // acts as a buffer for our lines
  triangles = {}; // this is used as a distinct array
  melCode = `
    createNode transform -n "playerCam";\n
    setAttr ".t" -type "double3" 1.7575689290363643e-15 0 -14.351639429916055 ;\n
    setAttr ".r" -type "double3" 0 180 -5.172681101354183e-14 ;\n
    createNode camera -n "playerCamShape" -p "playerCam";\n
    setAttr -k off ".v";\n
    setAttr ".rnd" no;\n
    setAttr ".cap" -type "double2" 0.94488 0.94488 ;\n
    setAttr ".ovr" 1.3;\n
    setAttr ".fl" 10.804840730034487;\n
    setAttr ".coi" 59.173509091945995;\n
    setAttr ".imn" -type "string" "persp1";\n
    setAttr ".den" -type "string" "persp1_depth";\n
    setAttr ".man" -type "string" "persp1_mask";\n
    setAttr ".hc" -type "string" "viewSet -p %camera";\n
    setAttr ".dr" yes;\n
  `
}

var correctX = function(x){
  return parseFloat(x) * -1.0;
}

process.stdin.on('data', (data) => {
  if(capturing){
    frame += `${data}`;
  }
});

process.on("SIGINT", () => {
  // SIGINT is how we can toggle this process.
  if(capturing){
    capturing = false;
    frame.split("\n").forEach((line)=>{
      var triangle = line.match(trimatcher);
      if(triangle){
        triangle.shift() // first match result is the whole line
        triangles[triangle] = undefined
      }
    })
    var count = 0;
    Object.keys(triangles).forEach((triangle)=>{
      count++;
      var coords = triangle.split(",")
      melCode += `polyCreateFacet -ch on -tx 1 -s 1 -p ${correctX(coords[1])} ${coords[2]} ${coords[3]} -p ${correctX(coords[5])} ${coords[6]} ${coords[7]} -p ${correctX(coords[9])} ${coords[10]} ${coords[11]} ;\n`
    })
    console.log(`${count} triangles captured`)
    fs.writeFile("./out.mel", melCode, function(err) {
        if(err) {
            return console.log(err);
        }
        console.log("The file was saved!");
    }); 
    console.log("CAPTURING DISABLED");
  } else {
    initVars();
    capturing = true;
    console.log("CAPTURING ENABLED");
  }
})