Align

Modify > Translate > Align... > Align - This tool requires two objects, one of which should be completely selected, and a click on two polygon normals. The Align tool will move and rotate selected geometry in such a way that the normal of the first click would face the normal of the second click.

To use the Align tool, first activate the tool. Click on a polygon of the selected geometry that you wish to align, then click on the polygon center that represents the target normal on the unselected geometry. All selected geometry will move so that the first normal shares the same root as the target normal, and this geometry will also rotate so that it faces the opposite direction of the target normal.

An example of Align usage: first click a polygon on the object to align, then click a polygon on an unselected target object. The selected object will move and rotate so that its clicked polygon center faces that of the clicked polygon center on the unselected box. Once aligned, a Transform gizmo permits further adjustment. Right clicking on a different polygon will move the gizmo to another location.

We want to align the front face of the selected red object with the top of the blue object. Both are on the same layer, neither is on any axis. First we click on the face of the red object we wish to align, next we click on the face of the blue object we wish that face to be aligned to and then the Transform gizmo appears for further modification

Choose Pivot

When the Choose Pivot button in the Numeric window is chosen, a widget of options is presented. Not all of them make sense, or work, with Align (the Edge and Edge Center ones do not), but they are all presented as follows: