Altitude and Latitude in Wilbur 1.80.00.00

[waldronate]

Altitude shading has been one of the real problems in the Wilbur shader since its inception. The model is that there are two gradients: one of altitudes above sea level and one for altitudes below sea level. There have been some add-ons to that model (opacity, min/max, lightness for ocean, and so on), but the basic model is still that you get two gradients (or Color Lists) that are mapped to two altitude ranges.

For what you're trying to do, try turning on the Absolute Coloring button on the altitude side and the setting Altitude Max to 120.

What I really recommend is using Filter>>Mathematical>>Span and setting the min/max values that you want in the units that you want. If your sea level isn't exactly where you want it, Filter>>Mathematical>>Offset lets you adjust the altitude of your entire selection (or whole world if there's no selection). To keep things, use File>>Save with type MDR to keep the altitudes exactly as they are at that point.

radicalcartography is fun to play with and shows that Venus has a maximum altitude of about 11000m above average and a minimum of about 4000m below average. Setting the altitude range to min=-4000 and max=11000 gets you the base Venus altitudes in meters. Then you can use your desired units in the Altitude shader.

For the latitude tab of the Wilbut to contribute to the final output, you must set a meaningful latitude range using Surface>>Map Info. For a whole-world map, set Top to 90, Left to -180, Right to 180, and bottom to -90. Then use the Blending tab on the Wilbur shader to activate it. Enter a 1 (or appropriate amount) into the fields for "Latitude". It's a bizarre user interface, I know. It's an example of the triumph of evolution over planning.