I get the original error again when I attempt to create a delta terrain from model to model after selecting each model and after specifying the vertical offset. There was a delay of many seconds after doing so before the error was raised. It didn't seem to be a fatal error when I clicked OK.
I wonder if the failure has anything to do with the fact that I had just created the file, created the terrain from a TIN file, then attached the other terrain, and then attempted to create the delta.
I'd consider sending the file, but one is 450 MB and the other is 13 MB, and because it's not really repeatable within that file, it doesn't make a lot of sense to pursue it within that file. (And I don't want to repeat the operation because it takes maybe 30 minutes to do it over.)
I wonder if the failure has anything to do with the fact that I had just created the file, created the terrain from a TIN file, then attached the other terrain, and then attempted to create the delta.
I'd consider sending the file, but one is 450 MB and the other is 13 MB, and because it's not really repeatable within that file, it doesn't make a lot of sense to pursue it within that file. (And I don't want to repeat the operation because it takes maybe 30 minutes to do it over.)