constructor() {
    this.info = null;
    this.path = '';
    this.apath = '';
    this.start = 0;
    this.end = 0;
    this.length = 0;
  }
Materials - A material auxiliary management class

####Example:

    const materials = new Materials();
    const endTime = materials.getDuration();
    const rect = materials.getSourceRect(width, height);

@class