use 1.0 as default gamma value
use 1.0 as default gamma value

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