Spline: fix interactive splines

hrt/prefab/l3d/Spline.hx

@@ -900,6 +900,38 @@ class Spline extends hrt.prefab.Object3D {
 		return { icon : "arrows-v", name : "Spline" };
 	}
 
+	override function makeInteractive() : hxd.SceneEvents.Interactive {
+		if(local3d == null)
+			return null;
+
+		var lineWidth = 1;
+		var colliders : Array<h3d.col.Collider> = [];
+		for (sIdx in 1...samples.length) {
+			var col = new h3d.col.Bounds();
+			var s0 = samples[sIdx - 1];
+			col.addPoint(new h3d.col.Point(s0.pos.x - lineWidth, s0.pos.y, s0.pos.z));
+			col.addPoint(new h3d.col.Point(s0.pos.x + lineWidth, s0.pos.y, s0.pos.z));
+			col.addPoint(new h3d.col.Point(s0.pos.x, s0.pos.y - lineWidth, s0.pos.z));
+			col.addPoint(new h3d.col.Point(s0.pos.x, s0.pos.y + lineWidth, s0.pos.z));
+
+			var s1 = samples[sIdx];
+			col.addPoint(new h3d.col.Point(s1.pos.x - lineWidth, s1.pos.y, s1.pos.z));
+			col.addPoint(new h3d.col.Point(s1.pos.x + lineWidth, s1.pos.y, s1.pos.z));
+			col.addPoint(new h3d.col.Point(s1.pos.x, s1.pos.y - lineWidth, s1.pos.z));
+			col.addPoint(new h3d.col.Point(s1.pos.x, s1.pos.y + lineWidth, s1.pos.z));
+			colliders.push(col);
+		}
+
+		var col = new h3d.col.Collider.GroupCollider(colliders);
+
+		var int = new h3d.scene.Interactive(col, local3d);
+		int.ignoreParentTransform = true;
+		int.preciseShape = col;
+		int.propagateEvents = true;
+		int.enableRightButton = true;
+		return int;
+	}
+
 	override function setSelected(b: Bool) : Bool {
 		super.setSelected(b);