more cleanups to modelviewer - no more 'sg' at all
more cleanups to modelviewer - no more 'sg' at all

Twinklebear/OSPRay,favreau/OSPRay,wilsonCernWq/ospray,MengjiaoH/ospray,wilsonCernWq/ospray,Twinklebear/OSPRay,ospray/OSPRay,ospray/OSPRay,Twinklebear/OSPRay,MengjiaoH/ospray,ospray/OSPRay,favreau/OSPRay,ospray/OSPRay,MengjiaoH/ospray,MengjiaoH/ospray,Twinklebear/OSPRay,MengjiaoH/ospray,wilsonCernWq/ospray,favreau/OSPRay,favreau/OSPRay