Updated builds.

build/three.js

@@ -15363,6 +15363,7 @@
 		};
 
 		this.fromBufferGeometry( new PlaneBufferGeometry( width, height, widthSegments, heightSegments ) );
+		this.mergeVertices();
 
 	}
 
@@ -20099,7 +20100,8 @@
 
 		this.forceContextLoss = function () {
 
-			extensions.get( 'WEBGL_lose_context' ).loseContext();
+			var extension = extensions.get( 'WEBGL_lose_context' );
+			if ( extension ) extension.loseContext();
 
 		};
 
@@ -24274,11 +24276,15 @@
 
 		var indices = [];
 		var vertices = [];
+		var normals = [];
 		var uvs = [];
 
+		var EPS = 0.00001;
+		var pu = new Vector3(), pv = new Vector3(), normal = new Vector3();
+
 		var i, j;
 
-		// generate vertices and uvs
+		// generate vertices, normals and uvs
 
 		var sliceCount = slices + 1;
 
@@ -24293,6 +24299,33 @@
 				var p = func( u, v );
 				vertices.push( p.x, p.y, p.z );
 
+				// approximate tangent vectors via finite differences
+
+				if ( u - EPS >= 0 ) {
+
+					pu.subVectors( p, func( u - EPS, v ) );
+
+				} else {
+
+					pu.subVectors( func( u + EPS, v ), p );
+
+				}
+
+				if ( v - EPS >= 0 ) {
+
+					pv.subVectors( p, func( u, v - EPS ) );
+
+				} else {
+
+					pv.subVectors( func( u, v + EPS ), p );
+
+				}
+
+				// cross product of tangent vectors returns surface normal
+
+				normal.crossVectors( pu, pv ).normalize();
+				normals.push( normal.x, normal.y, normal.z );
+
 				uvs.push( u, v );
 
 			}
@@ -24323,12 +24356,9 @@
 
 		this.setIndex( indices );
 		this.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
+		this.addAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
 		this.addAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
 
-		// generate normals
-
-		this.computeVertexNormals();
-
 	}
 
 	ParametricBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
@@ -25182,7 +25212,6 @@
 
 		var vertex = new Vector3();
 		var normal = new Vector3();
-		var uv = new Vector2();
 
 		var P1 = new Vector3();
 		var P2 = new Vector3();
@@ -25320,6 +25349,7 @@
 		};
 
 		this.fromBufferGeometry( new TorusBufferGeometry( radius, tube, radialSegments, tubularSegments, arc ) );
+		this.mergeVertices();
 
 	}
 
@@ -27028,6 +27058,7 @@
 		};
 
 		this.fromBufferGeometry( new SphereBufferGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) );
+		this.mergeVertices();
 
 	}
 
@@ -27170,6 +27201,7 @@
 		};
 
 		this.fromBufferGeometry( new RingBufferGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) );
+		this.mergeVertices();
 
 	}
 
@@ -27823,7 +27855,6 @@
 		// helper variables
 
 		var index = 0;
-		var indexOffset = 0;
 		var indexArray = [];
 		var halfHeight = height / 2;
 		var groupStart = 0;
@@ -28126,6 +28157,7 @@
 		};
 
 		this.fromBufferGeometry( new CircleBufferGeometry( radius, segments, thetaStart, thetaLength ) );
+		this.mergeVertices();
 
 	}
 

build/three.module.js

@@ -15357,6 +15357,7 @@ function PlaneGeometry( width, height, widthSegments, heightSegments ) {
 	};
 
 	this.fromBufferGeometry( new PlaneBufferGeometry( width, height, widthSegments, heightSegments ) );
+	this.mergeVertices();
 
 }
 
@@ -20093,7 +20094,8 @@ function WebGLRenderer( parameters ) {
 
 	this.forceContextLoss = function () {
 
-		extensions.get( 'WEBGL_lose_context' ).loseContext();
+		var extension = extensions.get( 'WEBGL_lose_context' );
+		if ( extension ) extension.loseContext();
 
 	};
 
@@ -24268,11 +24270,15 @@ function ParametricBufferGeometry( func, slices, stacks ) {
 
 	var indices = [];
 	var vertices = [];
+	var normals = [];
 	var uvs = [];
 
+	var EPS = 0.00001;
+	var pu = new Vector3(), pv = new Vector3(), normal = new Vector3();
+
 	var i, j;
 
-	// generate vertices and uvs
+	// generate vertices, normals and uvs
 
 	var sliceCount = slices + 1;
 
@@ -24287,6 +24293,33 @@ function ParametricBufferGeometry( func, slices, stacks ) {
 			var p = func( u, v );
 			vertices.push( p.x, p.y, p.z );
 
+			// approximate tangent vectors via finite differences
+
+			if ( u - EPS >= 0 ) {
+
+				pu.subVectors( p, func( u - EPS, v ) );
+
+			} else {
+
+				pu.subVectors( func( u + EPS, v ), p );
+
+			}
+
+			if ( v - EPS >= 0 ) {
+
+				pv.subVectors( p, func( u, v - EPS ) );
+
+			} else {
+
+				pv.subVectors( func( u, v + EPS ), p );
+
+			}
+
+			// cross product of tangent vectors returns surface normal
+
+			normal.crossVectors( pu, pv ).normalize();
+			normals.push( normal.x, normal.y, normal.z );
+
 			uvs.push( u, v );
 
 		}
@@ -24317,12 +24350,9 @@ function ParametricBufferGeometry( func, slices, stacks ) {
 
 	this.setIndex( indices );
 	this.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
+	this.addAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
 	this.addAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
 
-	// generate normals
-
-	this.computeVertexNormals();
-
 }
 
 ParametricBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
@@ -25176,7 +25206,6 @@ function TorusKnotBufferGeometry( radius, tube, tubularSegments, radialSegments,
 
 	var vertex = new Vector3();
 	var normal = new Vector3();
-	var uv = new Vector2();
 
 	var P1 = new Vector3();
 	var P2 = new Vector3();
@@ -25314,6 +25343,7 @@ function TorusGeometry( radius, tube, radialSegments, tubularSegments, arc ) {
 	};
 
 	this.fromBufferGeometry( new TorusBufferGeometry( radius, tube, radialSegments, tubularSegments, arc ) );
+	this.mergeVertices();
 
 }
 
@@ -27022,6 +27052,7 @@ function SphereGeometry( radius, widthSegments, heightSegments, phiStart, phiLen
 	};
 
 	this.fromBufferGeometry( new SphereBufferGeometry( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) );
+	this.mergeVertices();
 
 }
 
@@ -27164,6 +27195,7 @@ function RingGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, the
 	};
 
 	this.fromBufferGeometry( new RingBufferGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) );
+	this.mergeVertices();
 
 }
 
@@ -27817,7 +27849,6 @@ function CylinderBufferGeometry( radiusTop, radiusBottom, height, radialSegments
 	// helper variables
 
 	var index = 0;
-	var indexOffset = 0;
 	var indexArray = [];
 	var halfHeight = height / 2;
 	var groupStart = 0;
@@ -28120,6 +28151,7 @@ function CircleGeometry( radius, segments, thetaStart, thetaLength ) {
 	};
 
 	this.fromBufferGeometry( new CircleBufferGeometry( radius, segments, thetaStart, thetaLength ) );
+	this.mergeVertices();
 
 }