Line/Points: Support drawRange in raycast(). (#21481)

src/objects/Line.js

@@ -89,6 +89,7 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 		const geometry = this.geometry;
 		const matrixWorld = this.matrixWorld;
 		const threshold = raycaster.params.Line.threshold;
+		const drawRange = geometry.drawRange;
 
 		// Checking boundingSphere distance to ray
 
@@ -122,7 +123,10 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 			if ( index !== null ) {
 
-				for ( let i = 0, l = index.count - 1; i < l; i += step ) {
+				const start = Math.max( 0, drawRange.start );
+				const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );
+
+				for ( let i = start, l = end - 1; i < l; i += step ) {
 
 					const a = index.getX( i );
 					const b = index.getX( i + 1 );
@@ -157,7 +161,10 @@ Line.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 			} else {
 
-				for ( let i = 0, l = positionAttribute.count - 1; i < l; i += step ) {
+				const start = Math.max( 0, drawRange.start );
+				const end = Math.min( positionAttribute.count, ( drawRange.start + drawRange.count ) );
+
+				for ( let i = start, l = end - 1; i < l; i += step ) {
 
 					vStart.fromBufferAttribute( positionAttribute, i );
 					vEnd.fromBufferAttribute( positionAttribute, i + 1 );

src/objects/Points.js

@@ -46,6 +46,7 @@ Points.prototype = Object.assign( Object.create( Object3D.prototype ), {
 		const geometry = this.geometry;
 		const matrixWorld = this.matrixWorld;
 		const threshold = raycaster.params.Points.threshold;
+		const drawRange = geometry.drawRange;
 
 		// Checking boundingSphere distance to ray
 
@@ -73,7 +74,10 @@ Points.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 			if ( index !== null ) {
 
-				for ( let i = 0, il = index.count; i < il; i ++ ) {
+				const start = Math.max( 0, drawRange.start );
+				const end = Math.min( index.count, ( drawRange.start + drawRange.count ) );
+
+				for ( let i = start, il = end; i < il; i ++ ) {
 
 					const a = index.getX( i );
 
@@ -85,7 +89,10 @@ Points.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 			} else {
 
-				for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {
+				const start = Math.max( 0, drawRange.start );
+				const end = Math.min( positionAttribute.count, ( drawRange.start + drawRange.count ) );
+
+				for ( let i = start, l = end; i < l; i ++ ) {
 
 					_position.fromBufferAttribute( positionAttribute, i );