docs: public void prettyPrint(StringBuffer sb, int indent) {
          sb.append(Log.getSpaces(indent));
          sb.append(getClass().getSimpleName());
          sb.append(" [name=");
          sb.append(this.getName());
          sb.append("]");
          sb.append(System.lineSeparator());
          GVRRenderData rdata = getRenderData();
          GVRTransform trans = getTransform();
  
          if (rdata == null) {
              sb.append(Log.getSpaces(indent + 2));
              sb.append("RenderData: null");
              sb.append(System.lineSeparator());
          } else {
              rdata.prettyPrint(sb, indent + 2);
          }
          sb.append(Log.getSpaces(indent + 2));
          sb.append("Transform: "); sb.append(trans);
          sb.append(System.lineSeparator());
  
          // dump its children
          for (GVRSceneObject child : getChildren()) {
              child.prettyPrint(sb, indent + 2);
          }
      }