How can I align a Point Cloud precisely I have a Point Cloud (with 20 Points). In this Point Cloud I connected two vertices (in Edit mode) with one edge. Now I would like to align/rotate that edge (and the Point Cloud with it) to one axis (e.g. y-axis). So this edge would need to be exactly on the y-axis (no rotation). I can zero out one vertice of this edge to the the origin. But I struggle to understand how I could bring the second vertice onto the y-axis. Any help would be great.

Update: I would need the edge to be parallel to the y-axis.

This looks promising: 

http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/3D_interaction/Precise_Align
I wrote an addon, Mesh Align Plus, for strange situations just like this! In GIF form:



You can connect two of the points to form an edge if you like, it doesn't matter. You can also just move the point data (the mesh) by itself if you want to leave the object origin where it is. Check the demo video on the wiki (or ask here and I can include info for that).