Please Note: Our Discussion forums have moved. If you would like to discuss this article or any aspect of Revit, please do so at www.forums.revit.biz We will be more than pleased to help you with ANY Revit query. Welcome to Part 2 of this 3 part tutorial. Enough of the theory, let’s get back to Revit and create a one-face topo surface. We’ve seen from the discussion above that each point of a face can be at a different height- so we need to be able to tell Revit what these heights are. This is where the Options Bar comes into play:- 
Elevation refers to the height at which each point will be drawn at. You can draw as many points as you like and they will all be at whatever height this setting is at, until you change it. So let’s leave it at 0.0 for the moment and create a single-face surface. Add 3 points to the View, so that it looks like this:- 
Don’t worry about the exact location of the points in plan- that’s not important. What is important is that you’ve just formed the most basic topographical surface you can, within Revit. Well, you will form the surface if you tell Revit that you have finished sketching it and instruct it to “Finish Surface”. Let’s do that now. Hit the “Finish Surface” button on the Design Bar. 
Immediately the Toposurface is created. It doesn’t look at lot different apart from the fact that the points have disappeared. Our basic surface is pretty uninspiring, so let’s go and add some more faces to it. Go ahead and select the surface by clicking on it (it will turn red once selected) and then hit “Edit” on the Options Bar 
You will now find yourself back in Sketch Mode, with the points shown again. As we initiated the skech mode again from the Edit command, the default command on the Design bar is Modify. 
so go ahead and activate the Point command (we do this so we can continue to add more points (and consequently faces) to our surface. Now add two more points directly below the two that make up the base of our face. For clarity the two images below show each of the points being placed in turn:- the first point…. 
and the second point….. 
Let’s now finish the sketch and turn this into a proper Toposurface. Hit the Finish Surface command again. Here is our new Toposurface:- 
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