Const phong_material_pars_fragment
phong_material_pars_fragment: "struct ObjectSpaceRaymarchPhongMaterial {vec3 diffuse;vec3 emissive;vec3 specular;float shininess;};" = `struct ObjectSpaceRaymarchPhongMaterial {vec3 diffuse;vec3 emissive;vec3 specular;float shininess;};`