This renders an isometric landscape based on an internal array. You can customize your own array, but there are also presets you can use. To refresh the array click "render". Use turbo mode for a faster render (hold shift and click green flag). To toggle shading of the array, click "shading/no shading". To generate an array click "generate" and then click an option and follow the directions.
I fixed it for 3.0 and no longer requires Turbo Mode!! Based on Molybdenum's project http://scratch.mit.edu/projects/Molybdenum/2731329 Inspired by dragonsmithing http://scratch.mit.edu/projects/dragonsmithing/2738756