code: public static VertexData generateCrosshairs(float length) {
          final VertexData destination = new VertexData();
          final VertexAttribute positionsAttribute = new VertexAttribute("positions", DataType.FLOAT, 3);
          destination.addAttribute(0, positionsAttribute);
          final TFloatList positions = new TFloatArrayList();
          final TIntList indices = destination.getIndices();
          // Generate the mesh
          generateCrosshairs(positions, indices, length);
          // Put the mesh in the vertex data
          positionsAttribute.setData(positions);
          return destination;
      }
docs: Generates a crosshairs shaped wireframe in 3D. The center is at the intersection point of the three lines.
  
  @param length The length for the three lines
  @return The vertex data