Const physical_material_pars_fragment
physical_material_pars_fragment: "struct ObjectSpaceRaymarchPhysicalMaterial {vec3 diffuse;vec3 emissive;float metalness;float roughness;#ifdef REFLECTIVITYfloat reflectivity;#endif#ifdef CLEARCOATfloat clearcoat;float clearcoatRoughness;#endif};" = `struct ObjectSpaceRaymarchPhysicalMaterial {vec3 diffuse;vec3 emissive;float metalness;float roughness;#ifdef REFLECTIVITYfloat reflectivity;#endif#ifdef CLEARCOATfloat clearcoat;float clearcoatRoughness;#endif};`