- Download random_tin.rb.
- Move the file into your SketchUp/Plugins folder, restart SketchUp.
The input can be any valid SketchUp length, i.e. 1", 35.54, 4m. A pop-up will tell you if the value is not valid. The TIN is looped over and each point is moved up or down by an amount in the range of -amt to amt, where amt is the user entered value.