My world scale is set to 245.76km. I am trying to import a custom painted gradient to use as a mask. Unfortunately, the largest size I am allowed to use on an input file is 122.88km. This is just a quarter of the scale that I need to use. How can I get a custom mask that will fill the entire world I am building?
Ben
unfortunately, I don’t think that is possible… you may need to get the world size down to 122.88 
As Fil said, the limits on File Input worldsize needed to be set somewhere. I figured that 122.88km would be “enough for anybody”. Apparently not 
One workaround : cut your mask into 4 parts in photoshop and then use a different file input device for each one, positioning it appropriately. Combine them all together with several combiners set to Max mode.
Yes, that is a pain in the ass, but if you can’t reduce the world size for some reason, it IS a way to cover the entire area with your mask.
Neat idea, the four tiles. I’ll try that out.
What I have done for the moment is just what you suggested - I have reduced my world size and am reducing the feature size correspondingly.
Basically what I am doing is trying to create a view from an airplane overlooking a frozen tundra (mtns in the background). For the most part, this will be a matte painting, but I wanted to try WM and Terragen out to see how far I could take it there.
Nice program by the way.
Have you ever used Apple’s Shake? There are some neat interface features in there that might be useful in WM.
Ben