Blending SatMaps

SatMaps can give you a complex color maps to colorize your terrains. However, sometimes a map may look good but be just a little bit off, and you may be tempted to force a color change using ColorFX. While that is an option, it can be problematic as it is a "brute force" solution. An organic, and in many cases - better, method is to blend different SatMaps.

Here is an example. This terrain has a believable red hue which is strong, but not too strong.

This is the original SatMap. A portion of the map Rocky 207. However, by itself it is too red.

To make the map look more believable, we create a second SatMap node that uses a cooler hue. In this case, it is the map Blue 107.

When blended using a Combine node at 100% Max mode, you get a little bit of blue poking out through the red pixels. To further make this more realistic, the Combine node is masked with a high noise Perlin.