The next 4 tools are going to ask you for to specify  the face, edge, or vert you want as your target.
To do so you need to understand the information in the bar at the bottom of your screen.

D3Edit numbers things starting with 0.  Four faces will be numbered 0 through 3.

R: 45/56	Room #45 of 56 is current	Grid: 1	Grid increment is 1
F: 6/42	Face #6 of 42 is current	2058, 250,2430	Grid point you are pointing to
P: 0/3	Portal #0 of 3 is current	0,0,0	Current grid point (red X)
E: 0/4	Edge #0 of 4 (of the current face) is current	Face mode	Which mode you are in (face, vert, object)
V:(idx) 0/4(11/48)	Vert # 0 of the current face Vert # 11 of the current room is current	Marked V:0 F:0	How many verts and faces are marked.

You should watch Marked V:0 F:0.  It's a good way to make sure you haven't marked something accidentaly.
 
 

Snap Current Vert To Specified Face  This will Snap Current Vert To Specified Face moving marked verts with it. For this example I have 2 cubes in a room. Before marking the verts and making  one current be sure to find out the number of the face you want to snap to. I mark all the verts of the cube I want to move. Make a face current that contains the vert you want current.  It doesn't matter which face. Then use V to make the vert current.   Pick the Tool.  You are then prompted to enter which face to move it to (remember that it moves to plane of the face, not the face itself).  You also get prompted for an Edge.  This didnt seem to effect anything.   Pick enter and see what happens.

Snap Current Vert To Line of a Specified Edge For this tool you will have to know the number of the target edge and the number of the face that edge belongs to.  It will move it to the imaginary line (moving any marked verts with it) of that edge not necessarily the edge itself. Remeber that none of the verts get automaticaly attached should it hit the edge.  You will have to do that.

Snap Current Vert to Specified Vert Probably the one of these 4 that you will use the most.  To use it you most know the number of the target vert based on the room  (not on it's face).   Mark all the verts you want to move. Make one vert current. I circled the vert that will be my target. That will line up the cubes.   Pick the tool and tell it which vert to move the Current vert to. Remember: it's not attached until you remove extra verts

Snap Current Vert To Grid Point Moves the current vert to the nearest grid point moving all marked verts with it.  It's the nearest active grid point of the active 2D frame (front, top, or side)

Remove Extra Verts Like the name says... it removes extra verts.

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