A detector for detecting a particle is disclosed. A video decoder obtains, from the bitstream, the syntax element that indicates whether inter-viewlayer reference pictures are ever included in a reference picture list for a current view componentlayer representation. Each of the plurality of porogens has a shell with a liquid filler. The adhesive composition and the plastic housing composition fill the interspaces in a manner free of voids. This enables an optimum amount of welding, while minimizing the weakening of the metal being welded.