A little less than a year ago, I posted about how you can Make Hardscape Follow Topo with a very simple Dynamo definition. The main downside to this workflow is that it requires a corresponding Subregion with the same footprint as the Floor. Because it uses a Subregion to generate points, you also cannot control the amount of points that go into the Floor. But with a slightly more complicated definition, you can create the same result without a Subregion and even control how many points will modify the Floor.
So starting out, I created a definition (using Spring Nodes and Clockwork) that found the Floor boundary points and projected them onto the Toposurface.
This definition may work fine for smaller Floors that are on a relatively simple slope, but it does not incorporate any interior Topo points or Topo triangulation edges. So on more complex slopes, it is not particularly useful:
In order to incorporate those additional points, the definition gets a bit more complicated:
This definition produces essentially the same result as the older workflow that required a Subregion.
And this last definition places points at a specified interval along the Floor boundary.
The result does not follow the Topo perfectly, but it can be useful along curved edges and if you also want to modify the points manually.
I am considering creating a custom node or two from these more complex definitions, but I am still in the process of updating Landform to Dynamo 1.x. So in the meantime, here are both of these definitions (created in Dynamo 1.1.0):