fixing broken shading on edges of low polygon models
fixing broken shading on edges of low polygon models

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