It just some sort of a "quick hack" plugin I wrote because I did'n see an easy way to get correct alignment of the segments that build the new road in the IrrOdeCar demo of my IrrOde project. Information from the homepage:
This package includes a little plugin for IrrEdit. It is a plugin that modifies the scene inside the editor, it does not add any visibility or functionaliy for later use. I have created this plugin to give me an easy to use possibility to do the alignment of the segments that build the road in the "IrrOdeCar" demo of my IrrOde project.
To install the plugin to an already installed IrrEdit 1.5 just copy the .dll to the plugins and the content of the resources folder to IrrEdit's resources folder.
You will then see a new custom scene node in the custom scene node bar:
When you edit your scene make sure that all AnimatedMeshSceneNodes (this is the node type that this plugin affects) have unique IDs. Now you can add a VertexAlignSceneNode to your scene. Here's a little tutorial on how to use it:
Step 1: a scene before using the plugin:

As you can easliy see the nodes of the road are not aligned so it will be some trouble when you try to drive a car or something like that (maybe roll a marble?) over these nodes.
Step 2: Set the parameters of the VertexAlignSceneNode:
First you have to enter the ID of the first node to align to the node1Id field. Then you will get a new value (node1MeshCount) with the number of meshes the scene node contains. You can't edit this field, it is just there to show you how many meshes you can choose from. Then select one of the meshes with the node1Mesh field. This gives you another information field, node1VertexCount that shows you how many vertices the mesh contains. Again, this field can't be edited. But you can select the vertex to align with the newly shown node1AlignVertex field. As soon as you select a fieldy you will see a white cube drawn in wireframe mode around the selected vertex. Now search for a vertex suited for alignment. When you have done that search for the appropriate vertex of the second AnimatedMeshScceneNode. The field for this selection are the same as for node1, just with a node2 in the name.

When you are done with the selection you Just click the "activate" checkbox and the nodes will be aligned.
Step 3: The result:

I hope this plugin is useful for some other people, if you try the IrrOdeCar demo of my IrrOde project (http://www.bulletbyte.de/products.php?s ... how=irrode) you can see a whole road through the map modelled with this plugin.
