Fix bug in parsing view port from command line
Fix bug in parsing view port from command line

MengjiaoH/ospray,wilsonCernWq/ospray,MengjiaoH/ospray,wilsonCernWq/ospray,MengjiaoH/ospray,ospray/OSPRay,ospray/OSPRay,MengjiaoH/ospray,ospray/OSPRay,wilsonCernWq/ospray,MengjiaoH/ospray,ospray/OSPRay