Revert "Map shininess to phong exponent according to VRML spec"
Revert "Map shininess to phong exponent according to VRML spec"

This reverts commit 403ec6a8a1247f3e9efe237cfa3a5f3c5fd18ac3.
Looks strange with too many scenes.

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