I don't know why this is hapening, I've done this in the past and it worked out diferently.
I have an existing surface, I also created a second surface using feature lines and "grade to surface". Now I want to combine them and make a composite surface. So, I create a new surface, paste the existing surface and then the new proposed surface. The problem is when i do this they merge but the center of the existing surface dissapears.
See image for reference
How do i maintain the existing surface while still managing to add the proposed?
Solved! Go to Solution.
I know about the infill function, but what I actually need is the existing surface within the proposed dikes to show up. right now it is just blank space. I could use the infill function if it comes down to it but it will give me inaccurate volume calculations (since it will be a flat, infilled surface)
I just did this, and I am getting the same result. It clips out the middle (existing surface) even if i DONT have a hide boundary.
I've attached an image, the existing surface is shown in orange, the proposed dike in blue and the composite surface in green (which contains the proposed dike surface and the existing surface). as you can see the existing surface in the center of the dike does not get included when added to the composite surface.
if you are adding an outer boundary to your proposed dike surface and also a hide boundary in the middle, reorder in the surface build operation to have the hide boundary addition after (below in the list) the outer boundary addition, and see if that makes a difference.
interesting, i am seeing the same behavior as you are. even when i create a new blank surface, paste EG into it, then use the perimeter of the middle portion (toe of slope) as the outer boundary, and then paste that into the combined surface, i still cannot achieve desired results. with or without an infill on the FG, same deal.
sorry, not the answer you were probably looking for, hopefully someone wiser and more knowledgeable than I am will soon weigh in.
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