Merge pull request #12520 from maccesch/dev

fixed line precision raycasting outside the bounding sphere of Line

src/objects/Line.js

@@ -101,7 +101,6 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 		return function raycast( raycaster, intersects ) {
 
 			var precision = raycaster.linePrecision;
-			var precisionSq = precision * precision;
 
 			var geometry = this.geometry;
 			var matrixWorld = this.matrixWorld;
@@ -112,6 +111,7 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 			sphere.copy( geometry.boundingSphere );
 			sphere.applyMatrix4( matrixWorld );
+			sphere.radius += precision;
 
 			if ( raycaster.ray.intersectsSphere( sphere ) === false ) return;
 
@@ -120,6 +120,9 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 			inverseMatrix.getInverse( matrixWorld );
 			ray.copy( raycaster.ray ).applyMatrix4( inverseMatrix );
 
+			var localPrecision = precision / ( ( this.scale.x + this.scale.y + this.scale.z ) / 3 );
+			var localPrecisionSq = localPrecision * localPrecision;
+
 			var vStart = new Vector3();
 			var vEnd = new Vector3();
 			var interSegment = new Vector3();
@@ -146,7 +149,7 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 						var distSq = ray.distanceSqToSegment( vStart, vEnd, interRay, interSegment );
 
-						if ( distSq > precisionSq ) continue;
+						if ( distSq > localPrecisionSq ) continue;
 
 						interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation
 
@@ -178,7 +181,7 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 						var distSq = ray.distanceSqToSegment( vStart, vEnd, interRay, interSegment );
 
-						if ( distSq > precisionSq ) continue;
+						if ( distSq > localPrecisionSq ) continue;
 
 						interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation
 
@@ -212,7 +215,7 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 					var distSq = ray.distanceSqToSegment( vertices[ i ], vertices[ i + 1 ], interRay, interSegment );
 
-					if ( distSq > precisionSq ) continue;
+					if ( distSq > localPrecisionSq ) continue;
 
 					interRay.applyMatrix4( this.matrixWorld ); //Move back to world space for distance calculation