function Float32BufferAttribute( array, itemSize, normalized ) {

	THREE.BufferAttribute.call( this, new Float32Array( array ), itemSize, normalized );

}

Float32BufferAttribute.prototype = Object.create( THREE.BufferAttribute.prototype );
Float32BufferAttribute.prototype.constructor = Float32BufferAttribute;
THREE.Float32BufferAttribute = Float32BufferAttribute;



		/**
 * @author WestLangley / http://github.com/WestLangley
 *
 * parameters = {
 *  color: <hex>,
 *  linewidth: <float>,
 *  dashed: <boolean>,
 *  dashScale: <float>,
 *  dashSize: <float>,
 *  gapSize: <float>,
 *  resolution: <Vector2>, // to be set by renderer
 * }
 */

THREE.UniformsLib.line = {

	linewidth: { value: 1 , type:'f'},
	resolution: { value: new THREE.Vector2( 1, 1 ), type:'v2' },
	dashScale: { value: 1 , type:'f'},
	dashSize: { value: 1 , type:'f'},
	gapSize: { value: 1 , type:'f'} // todo FIX - maybe change to totalSize

};

THREE.ShaderLib[ 'line' ] = {

	uniforms: THREE.UniformsUtils.merge( [
		THREE.UniformsLib.common,
		THREE.UniformsLib.fog,
		THREE.UniformsLib.line
	] ),
	
	/* vertexShader:  
		`
		#include <common>
		#include <color_pars_vertex>
		 
		#include <logdepthbuf_pars_vertex>
		 

		uniform float linewidth;
		uniform vec2 resolution;

		attribute vec3 instanceStart;
		attribute vec3 instanceEnd;

		attribute vec3 instanceColorStart;
		attribute vec3 instanceColorEnd;

		varying vec2 vUv;

		#ifdef USE_DASH

			uniform float dashScale;
			attribute float instanceDistanceStart;
			attribute float instanceDistanceEnd;
			varying float vLineDistance;

		#endif

		void trimSegment( const in vec4 start, inout vec4 end ) {

			// trim end segment so it terminates between the camera plane and the near plane

			// conservative estimate of the near plane
			float a = projectionMatrix[ 2 ][ 2 ]; // 3nd entry in 3th column
			float b = projectionMatrix[ 3 ][ 2 ]; // 3nd entry in 4th column
			float nearEstimate = - 0.5 * b / a;

			float alpha = ( nearEstimate - start.z ) / ( end.z - start.z );

			end.xyz = mix( start.xyz, end.xyz, alpha );

		}

		void main() {

			#ifdef USE_COLOR

				vColor.xyz = ( position.y < 0.5 ) ? instanceColorStart : instanceColorEnd;

			#endif

			#ifdef USE_DASH

				vLineDistance = ( position.y < 0.5 ) ? dashScale * instanceDistanceStart : dashScale * instanceDistanceEnd;

			#endif

			float aspect = resolution.x / resolution.y;

			vUv = uv;

			// camera space
			vec4 start = modelViewMatrix * vec4( instanceStart, 1.0 );
			vec4 end = modelViewMatrix * vec4( instanceEnd, 1.0 );

			// special case for perspective projection, and segments that terminate either in, or behind, the camera plane
			// clearly the gpu firmware has a way of addressing this issue when projecting into ndc space
			// but we need to perform ndc-space calculations in the shader, so we must address this issue directly
			// perhaps there is a more elegant solution -- WestLangley

			bool perspective = ( projectionMatrix[ 2 ][ 3 ] == - 1.0 ); // 4th entry in the 3rd column

			if ( perspective ) {

				if ( start.z < 0.0 && end.z >= 0.0 ) {

					trimSegment( start, end );

				} else if ( end.z < 0.0 && start.z >= 0.0 ) {

					trimSegment( end, start );

				}

			}

			// clip space
			vec4 clipStart = projectionMatrix * start;
			vec4 clipEnd = projectionMatrix * end;

			// ndc space
			vec2 ndcStart = clipStart.xy / clipStart.w;
			vec2 ndcEnd = clipEnd.xy / clipEnd.w;

			// direction
			vec2 dir = ndcEnd - ndcStart;

			// account for clip-space aspect ratio
			dir.x *= aspect;
			dir = normalize( dir );

			// perpendicular to dir
			vec2 offset = vec2( dir.y, - dir.x );

			// undo aspect ratio adjustment
			dir.x /= aspect;
			offset.x /= aspect;

			// sign flip
			if ( position.x < 0.0 ) offset *= - 1.0;

			// endcaps
			if ( position.y < 0.0 ) {

				offset += - dir;

			} else if ( position.y > 1.0 ) {

				offset += dir;

			}

			// adjust for linewidth
			offset *= linewidth;

			// adjust for clip-space to screen-space conversion // maybe resolution should be based on viewport ...
			offset /= resolution.y;

			// select end
			vec4 clip = ( position.y < 0.5 ) ? clipStart : clipEnd;

			// back to clip space
			offset *= clip.w;

			clip.xy += offset;

			gl_Position = clip;

			vec4 mvPosition = ( position.y < 0.5 ) ? start : end; // this is an approximation

			#include <logdepthbuf_vertex>
			 
		 

		}
		`,

	fragmentShader:
		`
		uniform vec3 diffuse;
		uniform float opacity;

		#ifdef USE_DASH

			uniform float dashSize;
			uniform float gapSize;

		#endif

		varying float vLineDistance;

		#include <common>
		#include <color_pars_fragment>
		#include <fog_pars_fragment>
		#include <logdepthbuf_pars_fragment>
		 

		varying vec2 vUv;

		void main() {

			 

			#ifdef USE_DASH

				if ( vUv.y < - 1.0 || vUv.y > 1.0 ) discard; // discard endcaps

				if ( mod( vLineDistance, dashSize + gapSize ) > dashSize ) discard; // todo - FIX

			#endif

			if ( abs( vUv.y ) > 1.0 ) {

				float a = vUv.x;
				float b = ( vUv.y > 0.0 ) ? vUv.y - 1.0 : vUv.y + 1.0;
				float len2 = a * a + b * b;

				if ( len2 > 1.0 ) discard;

			}

			vec4 diffuseColor = vec4( diffuse, opacity );

			#include <logdepthbuf_fragment>
			#include <color_fragment>

			gl_FragColor = vec4( diffuseColor.rgb, diffuseColor.a );

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

		}
		` */
		//---------------去掉注释的版本-：----
	/*	
	  vertexShader:
		`
		#include <common>
		#include <color_pars_vertex>
		 
		#include <logdepthbuf_pars_vertex>
		 

		uniform float linewidth;
		uniform vec2 resolution;

		attribute vec3 instanceStart;
		attribute vec3 instanceEnd;

		attribute vec3 instanceColorStart;
		attribute vec3 instanceColorEnd;

		varying vec2 vUv;

		#ifdef USE_DASH

			uniform float dashScale;
			attribute float instanceDistanceStart;
			attribute float instanceDistanceEnd;
			varying float vLineDistance;

		#endif

		void trimSegment( const in vec4 start, inout vec4 end ) {

			float a = projectionMatrix[ 2 ][ 2 ]; 
			float b = projectionMatrix[ 3 ][ 2 ]; 
			float nearEstimate = - 0.5 * b / a;

			float alpha = ( nearEstimate - start.z ) / ( end.z - start.z );

			end.xyz = mix( start.xyz, end.xyz, alpha );

		}

		void main() {

			#ifdef USE_COLOR

				vColor.xyz = ( position.y < 0.5 ) ? instanceColorStart : instanceColorEnd;

			#endif

			#ifdef USE_DASH

				vLineDistance = ( position.y < 0.5 ) ? dashScale * instanceDistanceStart : dashScale * instanceDistanceEnd;

			#endif

			float aspect = resolution.x / resolution.y;

			vUv = uv;

			vec4 start = modelViewMatrix * vec4( instanceStart, 1.0 );
			vec4 end = modelViewMatrix * vec4( instanceEnd, 1.0 );


			bool perspective = ( projectionMatrix[ 2 ][ 3 ] == - 1.0 ); 
			if ( perspective ) {

				if ( start.z < 0.0 && end.z >= 0.0 ) {

					trimSegment( start, end );

				} else if ( end.z < 0.0 && start.z >= 0.0 ) {

					trimSegment( end, start );

				}

			}

			vec4 clipStart = projectionMatrix * start;
			vec4 clipEnd = projectionMatrix * end;

			vec2 ndcStart = clipStart.xy / clipStart.w;
			vec2 ndcEnd = clipEnd.xy / clipEnd.w;

			vec2 dir = ndcEnd - ndcStart;

			dir.x *= aspect;
			dir = normalize( dir );

			vec2 offset = vec2( dir.y, - dir.x );

			dir.x /= aspect;
			offset.x /= aspect;

			if ( position.x < 0.0 ) offset *= - 1.0;

			if ( position.y < 0.0 ) {

				offset += - dir;

			} else if ( position.y > 1.0 ) {

				offset += dir;

			}

			offset *= linewidth;

			offset /= resolution.y;

			vec4 clip = ( position.y < 0.5 ) ? clipStart : clipEnd;

			offset *= clip.w;

			clip.xy += offset;

			gl_Position = clip;

			vec4 mvPosition = ( position.y < 0.5 ) ? start : end; 
			#include <logdepthbuf_vertex>
			 
		 

		}
		`,

	fragmentShader:
		`
		uniform vec3 diffuse;
		uniform float opacity;

		#ifdef USE_DASH

			uniform float dashSize;
			uniform float gapSize;

		#endif

		varying float vLineDistance;

		#include <common>
		#include <color_pars_fragment>
		#include <fog_pars_fragment>
		#include <logdepthbuf_pars_fragment>
		 

		varying vec2 vUv;

		void main() {

			 

			#ifdef USE_DASH

				if ( vUv.y < - 1.0 || vUv.y > 1.0 ) discard; 

				if ( mod( vLineDistance, dashSize + gapSize ) > dashSize ) discard; 
			#endif

			if ( abs( vUv.y ) > 1.0 ) {

				float a = vUv.x;
				float b = ( vUv.y > 0.0 ) ? vUv.y - 1.0 : vUv.y + 1.0;
				float len2 = a * a + b * b;

				if ( len2 > 1.0 ) discard;

			}

			vec4 diffuseColor = vec4( diffuse, opacity );

			#include <logdepthbuf_fragment>
			#include <color_fragment>

			gl_FragColor = vec4( diffuseColor.rgb, diffuseColor.a );

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

		}
		`
	*/	
	//ie不支持模板字符串所以转成：
	vertexShader : "#include <common>\n#include <color_pars_vertex>\n \n#include <logdepthbuf_pars_vertex>\n \nuniform float linewidth;\nuniform vec2 resolution;\nattribute vec3 instanceStart;\nattribute vec3 instanceEnd;\nattribute vec3 instanceColorStart;\nattribute vec3 instanceColorEnd;\nvarying vec2 vUv;\n#ifdef USE_DASH\n	uniform float dashScale;\n	attribute float instanceDistanceStart;\n	attribute float instanceDistanceEnd;\n	varying float vLineDistance;\n#endif\nvoid trimSegment( const in vec4 start, inout vec4 end ) {\n	float a = projectionMatrix[ 2 ][ 2 ]; \n	float b = projectionMatrix[ 3 ][ 2 ]; \n	float nearEstimate = - 0.5 * b / a;\n	float alpha = ( nearEstimate - start.z ) / ( end.z - start.z );\n	end.xyz = mix( start.xyz, end.xyz, alpha );\n}\nvoid main() {\n	#ifdef USE_COLOR\n		vColor.xyz = ( position.y < 0.5 ) ? instanceColorStart : instanceColorEnd;\n	#endif\n	#ifdef USE_DASH\n		vLineDistance = ( position.y < 0.5 ) ? dashScale * instanceDistanceStart : dashScale * instanceDistanceEnd;\n	#endif\n	float aspect = resolution.x / resolution.y;\n	vUv = uv;\n	vec4 start = modelViewMatrix * vec4( instanceStart, 1.0 );\n	vec4 end = modelViewMatrix * vec4( instanceEnd, 1.0 );\n	bool perspective = ( projectionMatrix[ 2 ][ 3 ] == - 1.0 ); \n	if ( perspective ) {\n		if ( start.z < 0.0 && end.z >= 0.0 ) {\n			trimSegment( start, end );\n		} else if ( end.z < 0.0 && start.z >= 0.0 ) {\n			trimSegment( end, start );\n		}\n	}\n	vec4 clipStart = projectionMatrix * start;\n	vec4 clipEnd = projectionMatrix * end;\n	vec2 ndcStart = clipStart.xy / clipStart.w;\n	vec2 ndcEnd = clipEnd.xy / clipEnd.w;\n	vec2 dir = ndcEnd - ndcStart;\n	dir.x *= aspect;\n	dir = normalize( dir );\n	vec2 offset = vec2( dir.y, - dir.x );\n	dir.x /= aspect;\n	offset.x /= aspect;\n	if ( position.x < 0.0 ) offset *= - 1.0;\n	if ( position.y < 0.0 ) {\n		offset += - dir;\n	} else if ( position.y > 1.0 ) {\n		offset += dir;\n	}\n	offset *= linewidth;\n	offset /= resolution.y;\n	vec4 clip = ( position.y < 0.5 ) ? clipStart : clipEnd;\n	offset *= clip.w;\n	clip.xy += offset;\n	gl_Position = clip;\n	vec4 mvPosition = ( position.y < 0.5 ) ? start : end; \n	#include <logdepthbuf_vertex>\n	 \n \n}	",
	fragmentShader: "uniform vec3 diffuse;\n	uniform float opacity;\n	#ifdef USE_DASH\n		uniform float dashSize;\n		uniform float gapSize;\n	#endif\n	varying float vLineDistance;\n	#include <common>\n	#include <color_pars_fragment>\n	#include <fog_pars_fragment>\n	#include <logdepthbuf_pars_fragment>\n	 \n	varying vec2 vUv;\n	void main() {\n		 \n		#ifdef USE_DASH\n\nif ( vUv.y < - 1.0 || vUv.y > 1.0 ) discard; \n\nif ( mod( vLineDistance, dashSize + gapSize ) > dashSize ) discard; \n		#endif\n		if ( abs( vUv.y ) > 1.0 ) {\n\nfloat a = vUv.x;\n\nfloat b = ( vUv.y > 0.0 ) ? vUv.y - 1.0 : vUv.y + 1.0;\n\nfloat len2 = a * a + b * b;\n\nif ( len2 > 1.0 ) discard;\n		}\n		vec4 diffuseColor = vec4( diffuse, opacity );\n		#include <logdepthbuf_fragment>\n		#include <color_fragment>\n		gl_FragColor = vec4( diffuseColor.rgb, diffuseColor.a );\n		#include <premultiplied_alpha_fragment>\n		#include <tonemapping_fragment>\n		#include <encodings_fragment>\n		#include <fog_fragment>\n	}"
		
		
		
		
};

THREE.LineMaterial = function ( parameters ) {

	THREE.ShaderMaterial.call( this, {

		type: 'LineMaterial',

		uniforms: THREE.UniformsUtils.clone( THREE.ShaderLib[ 'line' ].uniforms ),

		vertexShader: THREE.ShaderLib[ 'line' ].vertexShader,
		fragmentShader: THREE.ShaderLib[ 'line' ].fragmentShader

	} );

	this.dashed = false;

	Object.defineProperties( this, {

		color: {

			enumerable: true,

			get: function () {

				return this.uniforms.diffuse.value;

			},

			set: function ( value ) {

				this.uniforms.diffuse.value = value;

			}

		},

		linewidth: {

			enumerable: true,

			get: function () {

				return this.uniforms.linewidth.value;

			},

			set: function ( value ) {

				this.uniforms.linewidth.value = value;

			}

		},

		dashScale: {

			enumerable: true,

			get: function () {

				return this.uniforms.dashScale.value;

			},

			set: function ( value ) {

				this.uniforms.dashScale.value = value;

			}

		},

		dashSize: {

			enumerable: true,

			get: function () {

				return this.uniforms.dashSize.value;

			},

			set: function ( value ) {

				this.uniforms.dashSize.value = value;

			}

		},

		gapSize: {

			enumerable: true,

			get: function () {

				return this.uniforms.gapSize.value;

			},

			set: function ( value ) {

				this.uniforms.gapSize.value = value;

			}

		},

		resolution: {

			enumerable: true,

			get: function () {

				return this.uniforms.resolution.value;

			},

			set: function ( value ) {

				this.uniforms.resolution.value.copy( value );

			}

		}

	} );

	this.setValues( parameters );

};

THREE.LineMaterial.prototype = Object.create( THREE.ShaderMaterial.prototype );
THREE.LineMaterial.prototype.constructor = THREE.LineMaterial;

THREE.LineMaterial.prototype.isLineMaterial = true;

THREE.LineMaterial.prototype.copy = function ( source ) {

	THREE.ShaderMaterial.prototype.copy.call( this, source );

	this.color.copy( source.color );

	this.linewidth = source.linewidth;

	this.resolution = source.resolution;

	// todo

	return this;

};

		
 
/**
 * @author WestLangley / http://github.com/WestLangley
 *
 */

THREE.LineSegmentsGeometry = function () {

	THREE.InstancedBufferGeometry.call( this );

	this.type = 'LineSegmentsGeometry';

	var plane = new THREE.BufferGeometry();

	var positions = [ - 1, 2, 0, 1, 2, 0, - 1, 1, 0, 1, 1, 0, - 1, 0, 0, 1, 0, 0, - 1, - 1, 0, 1, - 1, 0 ];
	var uvs = [ - 1, 2, 1, 2, - 1, 1, 1, 1, - 1, - 1, 1, - 1, - 1, - 2, 1, - 2 ];
	var index = new THREE.BufferAttribute(new Uint16Array([ 0, 2, 1, 2, 3, 1, 2, 4, 3, 4, 5, 3, 4, 6, 5, 6, 7, 5 ]), 1)
	
	this.setIndex( index );
	this.addAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
	this.addAttribute( 'uv', new THREE.Float32BufferAttribute( uvs, 2 ) );

};

THREE.LineSegmentsGeometry.prototype = Object.assign( Object.create( THREE.InstancedBufferGeometry.prototype ), {

	constructor: THREE.LineSegmentsGeometry,

	isLineSegmentsGeometry: true,

	applyMatrix: function ( matrix ) {

		var start = this.attributes.instanceStart;
		var end = this.attributes.instanceEnd;

		if ( start !== undefined ) {

			matrix.applyToBufferAttribute( start );

			matrix.applyToBufferAttribute( end );

			start.data.needsUpdate = true;

		}

		if ( this.boundingBox !== null ) {

			this.computeBoundingBox();

		}

		if ( this.boundingSphere !== null ) {

			this.computeBoundingSphere();

		}

		return this;

	},

	setPositions: function ( array ) {

		var lineSegments;

		if ( array instanceof Float32Array ) {

			lineSegments = array;

		} else if ( Array.isArray( array ) ) {

			lineSegments = new Float32Array( array );

		}

		var instanceBuffer = new THREE.InstancedInterleavedBuffer( lineSegments, 6, 1 ); // xyz, xyz

		this.addAttribute( 'instanceStart', new THREE.InterleavedBufferAttribute( instanceBuffer, 3, 0 ) ); // xyz
		this.addAttribute( 'instanceEnd', new THREE.InterleavedBufferAttribute( instanceBuffer, 3, 3 ) ); // xyz

		//

		this.computeBoundingBox();
		this.computeBoundingSphere();

		return this;

	},

	setColors: function ( array ) {

		var colors;

		if ( array instanceof Float32Array ) {

			colors = array;

		} else if ( Array.isArray( array ) ) {

			colors = new Float32Array( array );

		}

		var instanceColorBuffer = new THREE.InstancedInterleavedBuffer( colors, 6, 1 ); // rgb, rgb

		this.addAttribute( 'instanceColorStart', new THREE.InterleavedBufferAttribute( instanceColorBuffer, 3, 0 ) ); // rgb
		this.addAttribute( 'instanceColorEnd', new THREE.InterleavedBufferAttribute( instanceColorBuffer, 3, 3 ) ); // rgb

		return this;

	},

	fromWireframeGeometry: function ( geometry ) {

		this.setPositions( geometry.attributes.position.array );

		return this;

	},

	fromEdgesGeometry: function ( geometry ) {

		this.setPositions( geometry.attributes.position.array );

		return this;

	},

	fromMesh: function ( mesh ) {

		this.fromWireframeGeometry( new THREE.WireframeGeometry( mesh.geometry ) );

		// set colors, maybe

		return this;

	},

	fromLineSegements: function ( lineSegments ) {

		var geometry = lineSegments.geometry;

		if ( geometry.isGeometry ) {

			this.setPositions( geometry.vertices );

		} else if ( geometry.isBufferGeometry ) {

			this.setPositions( geometry.position.array ); // assumes non-indexed

		}

		// set colors, maybe

		return this;

	},

	computeBoundingBox: function () {

		var box = new THREE.Box3();

		return function computeBoundingBox() {

			if ( this.boundingBox === null ) {

				this.boundingBox = new THREE.Box3();

			}

			var start = this.attributes.instanceStart;
			var end = this.attributes.instanceEnd;

			if ( start !== undefined && end !== undefined ) {

				this.boundingBox.setFromBufferAttribute( start );

				box.setFromBufferAttribute( end );

				this.boundingBox.union( box );

			}

		};

	}(),

	computeBoundingSphere: function () {

		var vector = new THREE.Vector3();

		return function computeBoundingSphere() {

			if ( this.boundingSphere === null ) {

				this.boundingSphere = new THREE.Sphere();

			}

			if ( this.boundingBox === null ) {

				this.computeBoundingBox();

			}

			var start = this.attributes.instanceStart;
			var end = this.attributes.instanceEnd;

			if ( start !== undefined && end !== undefined ) {

				var center = this.boundingSphere.center;

				this.boundingBox.getCenter( center );

				var maxRadiusSq = 0;

				for ( var i = 0, il = start.count; i < il; i ++ ) {

					vector.fromBufferAttribute( start, i );
					maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( vector ) );

					vector.fromBufferAttribute( end, i );
					maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( vector ) );

				}

				this.boundingSphere.radius = Math.sqrt( maxRadiusSq );

				if ( isNaN( this.boundingSphere.radius ) ) {

					console.error( 'THREE.LineSegmentsGeometry.computeBoundingSphere(): Computed radius is NaN. The instanced position data is likely to have NaN values.', this );

				}

			}

		};

	}(),

	toJSON: function () {

		// todo

	},

	clone: function () {

		// todo

	},

	copy: function ( source ) {

		// todo

		return this;

	}

} );
		
		



/**
 * @author WestLangley / http://github.com/WestLangley
 *
 */

THREE.LineGeometry = function () {

	THREE.LineSegmentsGeometry.call( this );

	this.type = 'LineGeometry';

};

THREE.LineGeometry.prototype = Object.assign( Object.create( THREE.LineSegmentsGeometry.prototype ), {

	constructor: THREE.LineGeometry,

	isLineGeometry: true,

	setPositions: function ( array ) {

		// converts [ x1, y1, z1,  x2, y2, z2, ... ] to pairs format

		var length = array.length - 3;
		var points = new Float32Array( 2 * length );

		for ( var i = 0; i < length; i += 3 ) {

			points[ 2 * i ] = array[ i ];
			points[ 2 * i + 1 ] = array[ i + 1 ];
			points[ 2 * i + 2 ] = array[ i + 2 ];

			points[ 2 * i + 3 ] = array[ i + 3 ];
			points[ 2 * i + 4 ] = array[ i + 4 ];
			points[ 2 * i + 5 ] = array[ i + 5 ];

		}

		THREE.LineSegmentsGeometry.prototype.setPositions.call( this, points );

		return this;

	},

	setColors: function ( array ) {

		// converts [ r1, g1, b1,  r2, g2, b2, ... ] to pairs format

		var length = array.length - 3;
		var colors = new Float32Array( 2 * length );

		for ( var i = 0; i < length; i += 3 ) {

			colors[ 2 * i ] = array[ i ];
			colors[ 2 * i + 1 ] = array[ i + 1 ];
			colors[ 2 * i + 2 ] = array[ i + 2 ];

			colors[ 2 * i + 3 ] = array[ i + 3 ];
			colors[ 2 * i + 4 ] = array[ i + 4 ];
			colors[ 2 * i + 5 ] = array[ i + 5 ];

		}

		THREE.LineSegmentsGeometry.prototype.setColors.call( this, colors );

		return this;

	},

	fromLine: function ( line ) {

		var geometry = line.geometry;

		if ( geometry.isGeometry ) {

			this.setPositions( geometry.vertices );

		} else if ( geometry.isBufferGeometry ) {

			this.setPositions( geometry.position.array ); // assumes non-indexed

		}

		// set colors, maybe

		return this;

	},

	copy: function ( source ) {

		// todo

		return this;

	}

} );
		
		

		

		/**
 * @author WestLangley / http://github.com/WestLangley
 *
 */

THREE.LineSegments2 = function ( geometry, material ) {

	THREE.Mesh.call( this );

	this.type = 'LineSegments2';

	this.geometry = geometry !== undefined ? geometry : new THREE.LineSegmentsGeometry();
	this.material = material !== undefined ? material : new THREE.LineMaterial( { color: Math.random() * 0xffffff } );

};

THREE.LineSegments2.prototype = Object.assign( Object.create( THREE.Mesh.prototype ), {

	constructor: THREE.LineSegments2,

	isLineSegments2: true,

	computeLineDistances: ( function () { // for backwards-compatability, but could be a method of LineSegmentsGeometry...

		var start = new THREE.Vector3();
		var end = new THREE.Vector3();

		return function computeLineDistances() {

			var geometry = this.geometry;

			var instanceStart = geometry.attributes.instanceStart;
			var instanceEnd = geometry.attributes.instanceEnd;
			var lineDistances = new Float32Array( 2 * instanceStart.data.count );

			for ( var i = 0, j = 0, l = instanceStart.data.count; i < l; i ++, j += 2 ) {

				start.fromBufferAttribute( instanceStart, i );
				end.fromBufferAttribute( instanceEnd, i );

				lineDistances[ j ] = ( j === 0 ) ? 0 : lineDistances[ j - 1 ];
				lineDistances[ j + 1 ] = lineDistances[ j ] + start.distanceTo( end );

			}

			var instanceDistanceBuffer = new THREE.InstancedInterleavedBuffer( lineDistances, 2, 1 ); // d0, d1

			geometry.addAttribute( 'instanceDistanceStart', new THREE.InterleavedBufferAttribute( instanceDistanceBuffer, 1, 0 ) ); // d0
			geometry.addAttribute( 'instanceDistanceEnd', new THREE.InterleavedBufferAttribute( instanceDistanceBuffer, 1, 1 ) ); // d1

			return this;

		};

	}() ),

	copy: function ( source ) {

		// todo

		return this;

	}

} );


//fat line
THREE.Fatline = function ( geometry, material ) {

	THREE.LineSegments2.call( this );

	this.type = 'Fatline';

	this.geometry = geometry !== undefined ? geometry : new THREE.LineGeometry();
	this.material = material !== undefined ? material : new THREE.LineMaterial( { color: Math.random() * 0xffffff } );

};

THREE.Fatline.prototype = Object.assign( Object.create( THREE.LineSegments2.prototype ), {

	constructor: THREE.Fatline,

	isFatline: true,

	copy: function ( source ) {

		// todo

		return this;

	}

} );	

//////////CSS3DObject////////////

/**
 * Based on http://www.emagix.net/academic/mscs-project/item/camera-sync-with-css3-and-webgl-threejs
 * @author mrdoob / http://mrdoob.com/
 * @author yomotsu / https://yomotsu.net/
 */
(function(){ 
/* import {
	Matrix4,
	Object3D,
	Vector3
} from "../../../build/three.module.js";
 */
var Matrix4 = THREE.Matrix4,
Object3D  = THREE.Object3D,
Vector3 = THREE.Vector3 
 
 
var CSS3DObject = THREE.CSS3DObject = function ( element ) {

	Object3D.call( this );

	this.element = element;
	this.element.style.position = 'absolute';
	this.element.style.pointerEvents = 'auto';

	this.addEventListener( 'removed', function () {

		this.traverse( function ( object ) {

			if ( object.element instanceof Element && object.element.parentNode !== null ) {

				object.element.parentNode.removeChild( object.element );

			}

		} );

	} );

};

CSS3DObject.prototype = Object.create( Object3D.prototype );
CSS3DObject.prototype.constructor = CSS3DObject;
 
var CSS3DSprite = THREE.CSS3DSprite = function ( element ) {

	CSS3DObject.call( this, element );

};

CSS3DSprite.prototype = Object.create( CSS3DObject.prototype );
CSS3DSprite.prototype.constructor = CSS3DSprite;

//

var CSS3DRenderer = THREE.CSS3DRenderer = function () {

	var _width, _height;
	var _widthHalf, _heightHalf;

	var matrix = new Matrix4();

	var cache = {
		camera: { fov: 0, style: '' },
		objects: new WeakMap()
	};

	var domElement = document.createElement( 'div' );
	domElement.style.overflow = 'hidden';

	this.domElement = domElement;

	var cameraElement = document.createElement( 'div' );

	cameraElement.style.WebkitTransformStyle = 'preserve-3d';
	cameraElement.style.transformStyle = 'preserve-3d';
	cameraElement.style.pointerEvents = 'none';

	domElement.appendChild( cameraElement );

	var isIE =  /Trident/i.test( navigator.userAgent );

	this.getSize = function () {

		return {
			width: _width,
			height: _height
		};

	};

	this.setSize = function ( width, height ) {

		_width = width;
		_height = height;
		_widthHalf = _width / 2;
		_heightHalf = _height / 2;

		domElement.style.width = width + 'px';
		domElement.style.height = height + 'px';

		cameraElement.style.width = width + 'px';
		cameraElement.style.height = height + 'px';

	};

	function epsilon( value ) {

		return Math.abs( value ) < 1e-10 ? 0 : value;

	}

	function getCameraCSSMatrix( matrix ) {

		var elements = matrix.elements;

		return 'matrix3d(' +
			epsilon( elements[ 0 ] ) + ',' +
			epsilon( - elements[ 1 ] ) + ',' +
			epsilon( elements[ 2 ] ) + ',' +
			epsilon( elements[ 3 ] ) + ',' +
			epsilon( elements[ 4 ] ) + ',' +
			epsilon( - elements[ 5 ] ) + ',' +
			epsilon( elements[ 6 ] ) + ',' +
			epsilon( elements[ 7 ] ) + ',' +
			epsilon( elements[ 8 ] ) + ',' +
			epsilon( - elements[ 9 ] ) + ',' +
			epsilon( elements[ 10 ] ) + ',' +
			epsilon( elements[ 11 ] ) + ',' +
			epsilon( elements[ 12 ] ) + ',' +
			epsilon( - elements[ 13 ] ) + ',' +
			epsilon( elements[ 14 ] ) + ',' +
			epsilon( elements[ 15 ] ) +
		')';

	}

	function getObjectCSSMatrix( matrix, cameraCSSMatrix ) {

		var elements = matrix.elements;
		var matrix3d = 'matrix3d(' +
			epsilon( elements[ 0 ] ) + ',' +
			epsilon( elements[ 1 ] ) + ',' +
			epsilon( elements[ 2 ] ) + ',' +
			epsilon( elements[ 3 ] ) + ',' +
			epsilon( - elements[ 4 ] ) + ',' +
			epsilon( - elements[ 5 ] ) + ',' +
			epsilon( - elements[ 6 ] ) + ',' +
			epsilon( - elements[ 7 ] ) + ',' +
			epsilon( elements[ 8 ] ) + ',' +
			epsilon( elements[ 9 ] ) + ',' +
			epsilon( elements[ 10 ] ) + ',' +
			epsilon( elements[ 11 ] ) + ',' +
			epsilon( elements[ 12 ] ) + ',' +
			epsilon( elements[ 13 ] ) + ',' +
			epsilon( elements[ 14 ] ) + ',' +
			epsilon( elements[ 15 ] ) +
		')';

		if ( isIE ) {

			return 'translate(-50%,-50%)' +
				'translate(' + _widthHalf + 'px,' + _heightHalf + 'px)' +
				cameraCSSMatrix +
				matrix3d;

		}

		return 'translate(-50%,-50%)' + matrix3d;

	}

	function renderObject( object, camera, cameraCSSMatrix ) {

		if ( object instanceof CSS3DObject ) {

			var style;

			if ( object instanceof CSS3DSprite ) {

				// http://swiftcoder.wordpress.com/2008/11/25/constructing-a-billboard-matrix/

				matrix.copy( camera.matrixWorldInverse );
				matrix.transpose();
				matrix.copyPosition( object.matrixWorld );
				matrix.scale( object.scale );

				matrix.elements[ 3 ] = 0;
				matrix.elements[ 7 ] = 0;
				matrix.elements[ 11 ] = 0;
				matrix.elements[ 15 ] = 1;

				style = getObjectCSSMatrix( matrix, cameraCSSMatrix );

			} else {

				//style = getObjectCSSMatrix( object.matrixWorld, cameraCSSMatrix );
				style = getObjectCSSMatrix( object.matrixWorld, cameraCSSMatrix ) + (isIE ? "" : object.baseScale); //许钟文 加 object.baseScale针对小数，先在elem放大，然后这里缩小
			}

			var element = object.element;
			var cachedObject = cache.objects.get( object );

			if ( cachedObject === undefined || cachedObject.style !== style ) {

				element.style.WebkitTransform = style;
				element.style.transform = style;

				var objectData = { style: style };

				if ( isIE ) {

					objectData.distanceToCameraSquared = getDistanceToSquared( camera, object );

				}

				cache.objects.set( object, objectData );

			}

			if ( element.parentNode !== cameraElement ) {

				cameraElement.appendChild( element );

			}

		}

		for ( var i = 0, l = object.children.length; i < l; i ++ ) {

			renderObject( object.children[ i ], camera, cameraCSSMatrix );

		}

	}

	var getDistanceToSquared = function () {

		var a = new Vector3();
		var b = new Vector3();

		return function ( object1, object2 ) {

			a.setFromMatrixPosition( object1.matrixWorld );
			b.setFromMatrixPosition( object2.matrixWorld );

			return a.distanceToSquared( b );

		};

	}();

	function filterAndFlatten( scene ) {

		var result = [];

		scene.traverse( function ( object ) {

			if ( object instanceof CSS3DObject ) result.push( object );

		} );

		return result;

	}

	function zOrder( scene ) {

		var sorted = filterAndFlatten( scene ).sort( function ( a, b ) {

			var distanceA = cache.objects.get( a ).distanceToCameraSquared;
			var distanceB = cache.objects.get( b ).distanceToCameraSquared;

			return distanceA - distanceB;

		} );

		var zMax = sorted.length;

		for ( var i = 0, l = sorted.length; i < l; i ++ ) {

			sorted[ i ].element.style.zIndex = zMax - i;

		}

	}

	this.render = function ( scene, camera ) {

		var fov = camera.projectionMatrix.elements[ 5 ] * _heightHalf;

		if ( cache.camera.fov !== fov ) {

			if ( camera.isPerspectiveCamera ) {

				domElement.style.WebkitPerspective = fov + 'px';
				domElement.style.perspective = fov + 'px';

			} else {

				domElement.style.WebkitPerspective = '';
				domElement.style.perspective = '';

			}

			cache.camera.fov = fov;

		}

		if ( scene.autoUpdate === true ) scene.updateMatrixWorld();
		if ( camera.parent === null ) camera.updateMatrixWorld();

		if ( camera.isOrthographicCamera ) {

			var tx = - ( camera.right + camera.left ) / 2;
			var ty = ( camera.top + camera.bottom ) / 2;

		}

		var cameraCSSMatrix = camera.isOrthographicCamera ?
			'scale(' + fov + ')' + 'translate(' + epsilon( tx ) + 'px,' + epsilon( ty ) + 'px)' + getCameraCSSMatrix( camera.matrixWorldInverse ) :
			'translateZ(' + fov + 'px)' + getCameraCSSMatrix( camera.matrixWorldInverse );

		var style = cameraCSSMatrix +
			'translate(' + _widthHalf + 'px,' + _heightHalf + 'px)';

		if ( cache.camera.style !== style && ! isIE ) {

			cameraElement.style.WebkitTransform = style;
			cameraElement.style.transform = style;

			cache.camera.style = style;

		}

		renderObject( scene, camera, cameraCSSMatrix );

		if ( isIE ) {

			// IE10 and 11 does not support 'preserve-3d'.
			// Thus, z-order in 3D will not work.
			// We have to calc z-order manually and set CSS z-index for IE.
			// FYI: z-index can't handle object intersection
			zOrder( scene );

		}

	};

};

//export { CSS3DObject, CSS3DSprite, CSS3DRenderer };

})()