message: hotfix quad triangulation
diff: @@ -321,11 +321,16 @@ export default class Coverter {
  if ( n === 3 ) { // TRIANGLE FACE
  indices.push( faces[ k + 1 ], faces[ k + 2 ], faces[ k + 3 ] )
  } else { //Quad or N-GON FACE
  + if( n === 4) { // Handle quads the old way
  + indices.push( faces[ k + 1 ], faces[ k + 2 ], faces[ k + 3 ] )
  + indices.push( faces[ k + 1 ], faces[ k + 3 ], faces[ k + 4 ] )
  + } else { // Anything else goes through the magic box
  const triangulation = MeshTriangulationHelper.triangulateFace( k, faces, vertices )
  for( let t = 0; t < triangulation.length; t += 3 ) {
  indices.push( triangulation[ t ], triangulation[ t + 1 ], triangulation[ t + 2 ] )
  }
  }
  + }
  k += n + 1
  }
  