TubeGeometry: Added parametric radius via THREE.Path.

src/geometries/TubeGeometry.js

@@ -5,6 +5,7 @@
  * @author miningold / https://github.com/miningold
  * @author jonobr1 / https://github.com/jonobr1
  * @author Mugen87 / https://github.com/Mugen87
+ * @author spite / https://github.com/spite
  *
  */
 
@@ -13,6 +14,7 @@ import { BufferGeometry } from '../core/BufferGeometry.js';
 import { Float32BufferAttribute } from '../core/BufferAttribute.js';
 import { Vector2 } from '../math/Vector2.js';
 import { Vector3 } from '../math/Vector3.js';
+import { Path } from '../extras/core/Path.js';
 
 // TubeGeometry
 
@@ -84,7 +86,6 @@ function TubeBufferGeometry( path, tubularSegments, radius, radialSegments, clos
 	var vertex = new Vector3();
 	var normal = new Vector3();
 	var uv = new Vector2();
-	var P = new Vector3();
 
 	var i, j;
 
@@ -138,10 +139,13 @@ function TubeBufferGeometry( path, tubularSegments, radius, radialSegments, clos
 
 		// we use getPointAt to sample evenly distributed points from the given path
 
-		P = path.getPointAt( i / tubularSegments, P );
+		var P = path.getPointAt( i / tubularSegments );
+		var P1;
+		var P2;
 
 		// retrieve corresponding normal and binormal
 
+		var T = frames.tangents[ i ];
 		var N = frames.normals[ i ];
 		var B = frames.binormals[ i ];
 
@@ -161,16 +165,43 @@ function TubeBufferGeometry( path, tubularSegments, radius, radialSegments, clos
 			normal.z = ( cos * N.z + sin * B.z );
 			normal.normalize();
 
-			normals.push( normal.x, normal.y, normal.z );
-
 			// vertex
 
-			vertex.x = P.x + radius * normal.x;
-			vertex.y = P.y + radius * normal.y;
-			vertex.z = P.z + radius * normal.z;
+			var r = radius instanceof Path ? radius.getPointAt( i / tubularSegments ).y : radius;
+			vertex.x = P.x + r * normal.x;
+			vertex.y = P.y + r * normal.y;
+			vertex.z = P.z + r * normal.z;
 
 			vertices.push( vertex.x, vertex.y, vertex.z );
 
+			// adjust normals if the radius is a Path
+
+			if ( radius instanceof Path ) {
+
+				var delta = 0.0001;
+				var t1 = i / tubularSegments - delta;
+				var t2 = i / tubularSegments + delta;
+
+				// Capping in case of danger
+
+				if ( t1 < 0 ) t1 = 0;
+				if ( t2 > 1 ) t2 = 1;
+
+				P1 = path.getPointAt( t1, P1 );
+				P2 = path.getPointAt( t2, P2 );
+				var delta = P1.distanceTo( P2 );
+
+				var r1 = radius.getPointAt( t1 ).y;
+				var r2 = radius.getPointAt( t2 ).y;
+
+				normal.addScaledVector( T, - ( r2 - r1 ) / delta ).normalize();
+
+			}
+
+			// push the normal
+
+			normals.push( normal.x, normal.y, normal.z );
+
 		}
 
 	}