I'm having an issue as seen in the following screenshot.

This started out as Charterhall. I'm turning it a "Belvedere" for personal use. I changed the grass textures and background and ran into this problem. I am pretty sure I need to re-color all of the grass and cornfield polygons in the chart.3do file. I lowered the horizon some but it is about as low as it can go without being all sky. I started re-coloring polygons with 3doeds.exe but soon found that I was going to be spending the next five or so years working away at it going polygon by polygon. Is there a way to "grab" all of the "grass" polygons and all of the "cornfield" polygons and change their colors at one time, or is this going to be one long, long, long project?
Thanks for any input.