// We have all materials ?
 public bool WeHaveAllMats(string key = null)
 {
     if (CurrentStep.HasAllMats())
     {
         FrameHelper.UpdateDebugFrame(key, "We have all materials");
         return(true);
     }
     FrameHelper.UpdateDebugFrame(key, "We don't have all materials");
     return(false);
 }