three.js/src/renderers/shaders/ShaderLib/meshphysical_frag.glsl

#define PHYSICAL

uniform vec3 diffuse;
uniform vec3 emissive;

#ifdef STANDARD_SG
	uniform float glossiness;
	uniform vec3 specular2;
#else
	uniform float roughness;
	uniform float metalness;
#endif

uniform float opacity;

#ifndef STANDARD
	uniform float clearCoat;
	uniform float clearCoatRoughness;
#endif

varying vec3 vViewPosition;

#ifndef FLAT_SHADED

	varying vec3 vNormal;

#endif

#include <common>
#include <packing>
#include <color_pars_fragment>
#include <uv_pars_fragment>
#include <uv2_pars_fragment>
#include <map_pars_fragment>
#include <alphamap_pars_fragment>
#include <aomap_pars_fragment>
#include <lightmap_pars_fragment>
#include <emissivemap_pars_fragment>
#include <envmap_pars_fragment>
#include <fog_pars_fragment>
#include <bsdfs>
#include <cube_uv_reflection_fragment>
#include <lights_pars>
#include <lights_physical_pars_fragment>
#include <shadowmap_pars_fragment>
#include <bumpmap_pars_fragment>
#include <normalmap_pars_fragment>

#ifdef STANDARD_SG
	#include <glossinessmap_pars_fragment>
	#include <specular2map_pars_fragment>
#else
	#include <roughnessmap_pars_fragment>
	#include <metalnessmap_pars_fragment>
#endif

#include <logdepthbuf_pars_fragment>
#include <clipping_planes_pars_fragment>

void main() {

	#include <clipping_planes_fragment>

	vec4 diffuseColor = vec4( diffuse, opacity );
	ReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );
	vec3 totalEmissiveRadiance = emissive;

	#include <logdepthbuf_fragment>
	#include <map_fragment>
	#include <color_fragment>
	#include <alphamap_fragment>
	#include <alphatest_fragment>
	#include <specularmap_fragment>

	#ifdef STANDARD_SG
		#include <glossinessmap_fragment>
		#include <specular2map_fragment>
	#else
		#include <roughnessmap_fragment>
		#include <metalnessmap_fragment>
	#endif

	#include <normal_flip>
	#include <normal_fragment>
	#include <emissivemap_fragment>

	// accumulation
	#include <lights_physical_fragment>
	#include <lights_template>

	// modulation
	#include <aomap_fragment>

	vec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;

	gl_FragColor = vec4( outgoingLight, diffuseColor.a );

	#include <premultiplied_alpha_fragment>
	#include <tonemapping_fragment>
	#include <encodings_fragment>
	#include <fog_fragment>

}