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I would like to extude below the surface If I can how do I input a negative number to extrude on? I am trying to make a block diagram showing soil depths and geology below

Question asked by jbdyer on Jan 22, 2018

When I try to make a field to extrude on I have not discovered what type of field I need to enter negatives or is the solution to think positive with the geology at zero then raise the soil type above with the clipped ortho-photo above that?