This was one of those weird weekends where I didn’t get as much free time as I would have liked to but I still managed to get a lot done. The three brushes, altitude, rainfall, and temperature, are done. For each one of them it is possible to control the strength and add noise to the output. The noise effect is proportional to the size of the brush. So smaller brushes will generate more jagged terrain than larger brushes. Additionally I added an extra control to each of the brushes to activate what I call a ‘flatten‘ mode, which, instead of raising or lowering the selected cell property (altitude, etc) where applied, it instead averages the affected value between the neighboring cells. When used with the altitude brush, this has an erosion-like effect, lowering the height of peaks and raising valleys while smoothing the overall jaggedness.

Here’s a long .gif animation showing all brush tools and effects in no particular order: