three.js/examples/js/nodes/materials/StandardNode.js

/**
 * @author sunag / http://www.sunag.com.br/
 */

THREE.StandardNode = function() {

	THREE.GLNode.call( this );

	this.color = new THREE.ColorNode( 0xEEEEEE );
	this.roughness = new THREE.FloatNode( 0.5 );
	this.metalness = new THREE.FloatNode( 0.5 );

};

THREE.StandardNode.prototype = Object.create( THREE.GLNode.prototype );
THREE.StandardNode.prototype.constructor = THREE.StandardNode;

THREE.StandardNode.prototype.build = function( builder ) {

	var material = builder.material;
	var code;

	material.define( 'STANDARD' );
	material.define( 'ALPHATEST', '0.0' );

	material.requestAttrib.light = true;

	if ( builder.isShader( 'vertex' ) ) {

		var transform = this.transform ? this.transform.verifyAndBuildCode( builder, 'v3' ) : undefined;

		material.mergeUniform( THREE.UniformsUtils.merge( [

			THREE.UniformsLib[ "fog" ],
			THREE.UniformsLib[ "ambient" ],
			THREE.UniformsLib[ "lights" ],
			THREE.UniformsLib[ "shadowmap" ]

		] ) );

		material.addVertexPars( [
			"varying vec3 vViewPosition;",

			"#ifndef FLAT_SHADED",

			"	varying vec3 vNormal;",

			"#endif",

			THREE.ShaderChunk[ "common" ],
			THREE.ShaderChunk[ "lights_phong_pars_vertex" ],
			THREE.ShaderChunk[ "morphtarget_pars_vertex" ],
			THREE.ShaderChunk[ "skinning_pars_vertex" ],
			THREE.ShaderChunk[ "shadowmap_pars_vertex" ],
			THREE.ShaderChunk[ "logdepthbuf_pars_vertex" ]

		].join( "\n" ) );

		var output = [
				THREE.ShaderChunk[ "beginnormal_vertex" ],
				THREE.ShaderChunk[ "morphnormal_vertex" ],
				THREE.ShaderChunk[ "skinbase_vertex" ],
				THREE.ShaderChunk[ "skinnormal_vertex" ],
				THREE.ShaderChunk[ "defaultnormal_vertex" ],

			"#ifndef FLAT_SHADED", // Normal computed with derivatives when FLAT_SHADED

			"	vNormal = normalize( transformedNormal );",

			"#endif",

				THREE.ShaderChunk[ "begin_vertex" ]
		];

		if ( transform ) {

			output.push( transform.code );
			output.push( "transformed = " + transform.result + ";" );

		}

		output.push(
				THREE.ShaderChunk[ "morphtarget_vertex" ],
				THREE.ShaderChunk[ "skinning_vertex" ],
				THREE.ShaderChunk[ "project_vertex" ],
				THREE.ShaderChunk[ "logdepthbuf_vertex" ],

			"	vViewPosition = - mvPosition.xyz;",

				THREE.ShaderChunk[ "worldpos_vertex" ],
				THREE.ShaderChunk[ "lights_phong_vertex" ],
				THREE.ShaderChunk[ "shadowmap_vertex" ]
		);

		code = output.join( "\n" );

	}
	else {

		// CubeMap blur effect (PBR)

		builder.require.cubeTextureBias = builder.require.cubeTextureBias || new THREE.RoughnessToBlinnExponentNode();

		// verify all nodes to reuse generate codes

		this.color.verify( builder );
		this.roughness.verify( builder );
		this.metalness.verify( builder );

		if ( this.alpha ) this.alpha.verify( builder );

		if ( this.ao ) this.ao.verify( builder );
		if ( this.ambient ) this.ambient.verify( builder );
		if ( this.shadow ) this.shadow.verify( builder );
		if ( this.emissive ) this.emissive.verify( builder );

		if ( this.normal ) this.normal.verify( builder );
		if ( this.normalScale && this.normal ) this.normalScale.verify( builder );

		if ( this.environment ) this.environment.verify( builder.setCache( 'env' ) ); // isolate environment from others inputs ( see TextureNode, CubeTextureNode )
		if ( this.reflectivity && this.environment ) this.reflectivity.verify( builder );

		// build code

		var color = this.color.buildCode( builder, 'v4' );
		var roughness = this.roughness.buildCode( builder, 'fv1' );
		var metalness = this.metalness.buildCode( builder, 'fv1' );

		var alpha = this.alpha ? this.alpha.buildCode( builder, 'fv1' ) : undefined;

		var ao = this.ao ? this.ao.buildCode( builder, 'c' ) : undefined;
		var ambient = this.ambient ? this.ambient.buildCode( builder, 'c' ) : undefined;
		var shadow = this.shadow ? this.shadow.buildCode( builder, 'c' ) : undefined;
		var emissive = this.emissive ? this.emissive.buildCode( builder, 'c' ) : undefined;

		var normal = this.normal ? this.normal.buildCode( builder, 'v3' ) : undefined;
		var normalScale = this.normalScale && this.normal ? this.normalScale.buildCode( builder, 'fv1' ) : undefined;

		var environment = this.environment ? this.environment.buildCode( builder.setCache( 'env' ), 'c' ) : undefined;
		var reflectivity = this.reflectivity && this.environment ? this.reflectivity.buildCode( builder, 'fv1' ) : undefined;

		material.requestAttrib.transparent = alpha != undefined;

		material.addFragmentPars( [

			"varying vec3 vViewPosition;",

			"#ifndef FLAT_SHADED",

			"	varying vec3 vNormal;",

			"#endif",

			THREE.ShaderChunk[ "common" ],
			THREE.ShaderChunk[ "fog_pars_fragment" ],
			THREE.ShaderChunk[ "bsdfs" ],
			THREE.ShaderChunk[ "ambient_pars" ],
			THREE.ShaderChunk[ "lights_pars" ],
			THREE.ShaderChunk[ "lights_standard_pars_fragment" ],
			THREE.ShaderChunk[ "shadowmap_pars_fragment" ],
			THREE.ShaderChunk[ "logdepthbuf_pars_fragment" ],
		].join( "\n" ) );

		var output = [
				// prevent undeclared normal
				THREE.ShaderChunk[ "normal_fragment" ],

				// prevent undeclared material
			"	StandardMaterial material;",

				color.code,
			"	vec4 diffuseColor = " + color.result + ";",
			"	ReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );",

				THREE.ShaderChunk[ "logdepthbuf_fragment" ],

			roughness.code,
			"	float roughnessFactor = " + roughness.result + ";",

			metalness.code,
			"	float metalnessFactor = " + metalness.result + ";"
		];

		if ( alpha ) {

			output.push(
				alpha.code,
				'if ( ' + alpha.result + ' <= ALPHATEST ) discard;'
			);

		}

		if ( normal ) {

			builder.include( 'perturbNormal2Arb' );

			output.push( normal.code );

			if ( normalScale ) output.push( normalScale.code );

			output.push(
				'normal = perturbNormal2Arb(-vViewPosition,normal,' +
				normal.result + ',' +
				new THREE.UVNode().build( builder, 'v2' ) + ',' +
				( normalScale ? normalScale.result : '1.0' ) + ');'
			);

		}

		output.push(
			THREE.ShaderChunk[ "shadowmap_fragment" ],

			// accumulation
			'material.diffuseColor = diffuseColor.rgb * ( 1.0 - metalnessFactor );',
			'material.specularRoughness = clamp( roughnessFactor, 0.001, 1.0 );', // disney's remapping of [ 0, 1 ] roughness to [ 0.001, 1 ]
			'material.specularColor = mix( vec3( 0.04 ), diffuseColor.rgb, metalnessFactor );',

			THREE.ShaderChunk[ "lights_template" ]
		);

		if ( ao ) {

			output.push( ao.code );
			output.push( "reflectedLight.indirectDiffuse *= " + ao.result + ";" );

		}

		if ( ambient ) {

			output.push( ambient.code );
			output.push( "reflectedLight.indirectDiffuse += " + ambient.result + ";" );

		}

		if ( shadow ) {

			output.push( shadow.code );
			output.push( "reflectedLight.directDiffuse *= " + shadow.result + ";" );
			output.push( "reflectedLight.directSpecular *= " + shadow.result + ";" );

		}

		if ( emissive ) {

			output.push( emissive.code );
			output.push( "reflectedLight.directDiffuse += " + emissive.result + ";" );

		}

		if ( environment ) {

			output.push( environment.code );
			output.push( "RE_IndirectSpecular(" + environment.result + ", geometry, material, reflectedLight );" );

		}

		if ( reflectivity ) {

			output.push( reflectivity.code );
			output.push( "reflectedLight.indirectSpecular *= " + reflectivity.result + ";" );

		}

		output.push( "vec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular;" );

		output.push(
			THREE.ShaderChunk[ "linear_to_gamma_fragment" ],
			THREE.ShaderChunk[ "fog_fragment" ]
		);

		if ( alpha ) {

			output.push( "gl_FragColor = vec4( outgoingLight, " + alpha.result + " );" );

		}
		else {

			output.push( "gl_FragColor = vec4( outgoingLight, 1.0 );" );

		}

		code = output.join( "\n" );

	}

	return code;

};