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Select 3D Areas

Select the 3D areas to include in the horizon math calculations by selecting one of three options from the Select Areas drop-down menu:

All (x) areas selected – includes all 3D areas in your horizon math calculations. This is the default.
Select some areas – keeps track of the number of areas included in the horizon math calculations. Highlight the 3D areas you wish to include.
No area selected – excludes all 3D areas from your horizon math calculations.