Progressive render for Animations

// This script renders all the MXS files located in the input folder but instead of rendering them sequentially until each one reaches the final SL, it renders them incrementally.
//First it renders all the frames up to SL 4, producing a low SL version of the whole animation that you can use for starting post-production tasks,
//and then continues refining the whole animation to SL 6, 8, 10,... in steps of 2 Sampling Levels, until the indicated final SL.
// It is useful for quickly previewing animations, and for overlapping the rendering process with the postproduction process, saving a huge amount of time in animation projects.

var inputFolder = "C:\input";
var outputFolder = "C:\output";

var mxsCount = FileManager.getNumberOfFilesInFolder( inputFolder, "*.mxs" );
var mxsList = FileManager.getFilesInFolder( inputFolder, "*.mxs" );

RenderEvents["renderFinished()"].connect(renderHasFinished);

var initialSL = 4;
var finalSL = 12;
var slStep = 2;
var currentSL = initialSL;

var i = 0;
var isRendering = 0;

while( currentSL <= finalSL )
{
   for( i = 0; i < mxsCount; i++ )
   {
      renderScene();
      while( 1 )
      {
         if( isRendering == 0 )
         {
         break;
         }
      }
   }

   currentSL += slStep;
}

//////////////////////////////////////////////////////////////////

function renderScene()
{
   var mxsFile = mxsList[i];
   var imagePath = outputFolder + "\" + FileManager.getFileName( mxsFile ) + ".png";
   var mxiPath = outputFolder + "\" + FileManager.getFileName( mxsFile ) + ".mxi";


   Maxwell.print( "rendering Mxs file: " + mxsFile );


   Maxwell.openMxs( mxsFile );
   Scene.setImagePath( imagePath );
   Scene.setMxiPath( mxiPath );
   Scene.setSamplingLevel( currentSL );
   Scene.setResX( 400 );
   Scene.setResY( 400 );
   Scene.setResumeRenderEnabled( true );


   isRendering = 1;
   Maxwell.startRender();
}

//////////////////////////////////////////////////////////////////


function renderHasFinished()
{
   isRendering = 0;

   Maxwell.print( "Render finished!!" );
}

//////////////////////////////////////////////////////////////////