b1 multi world600 bodyb1 multi world600 body ammob1 multi world600 body bundleb2 thread countb3 ammob3 dynamic shadowb3 not optimizedb4 multi world600 bodyb4 multi world600 body ammob4 multi world600 body bundleb4 multi world600 body bundle runtimeb4 multi world600 body runtimet constraintt multi physics runtimet multi physics runtime shadowt physics plugint physics runtimet physics runtime manual transform