Hi! This tool will let you sculpt your terrain in 3D. It even has a template mask for the mapping contest.

I made this tool for the ace of spades, but it should work fine with RWR. I changed the water level to 20,20,20 rgb, and made the template size 2048x2048.
https://dl.dropbox.com/u/1660874/game/heightmap2.0.zipYou need Blender 3D to run the template file:
http://www.blender.org/download/get-blender/Install Blender
Unzip my heightmap template where ever you like.
Double click on the heightmap2.blend file to run it in Blender.
Open the tutorial.PNG file in your favorite image browser, web browser, or whatever.
Here is a link to make is easy on you:
https://dl.dropbox.com/u/1660874/game/tutorial.jpgIn a nutshell
You can paint on the blue plane. at any time. I suggest adding some height to the brush, with the height slider, and laying out where your buildings will go first, then go and paint in your hills and mountains and beach heads.
To see the
layout for the mapping contest, put a check in the textured solids check-box to briefly see where the boundaries are. You will need to remove the check-mark to see the shading on the terrain again. (right hand side of the 3d window, see #1 in the tutorial.png file for more details.)
When you are done, or just want to preview the heightmap, press F-12, and the black box on the right will turn into your heightmap. If you like it
HOVER YOUR MOUSE over the heightmap window and press F3 to save it. If the mouse is not over the heightmap when you press f3 nothing will happen, so make sure your mouse is over the heightmap.
Refer to the tutorial.png file for more help.
Brushes change the shape of the hills, be sure to experiment with them to get maximum control over your sculpting.
Here is a hot-key list, for when you get elite with the tool.
Code:
Controls:
Left mouse button - Raise terrain (3D view only).
Control+Left mouse button- Lower terrain
Shift+Left mouse button - Smooth terrain (3D view only).
F- change the brush size/radius.
Middle mouse button - Rotate in the (3D view only).
F12- Render the bumpmap.
F3- Save the bumpmap.
F: an interactive brush resize
Shift F: an interactive brush strength adjuster
Ctrl F: in interactive texture angle adjuster for your brush.
Shift B: a rectanglular zoom selection for close-up work
Alt B: hides all but selected rectangle
A: toggles airbrush
S: smooth
D: draw
G: grab
L: layer
I: inflate
P: pinch
V: toggles add and subtract in draw mode
Use X, Y and Z buttons to toggle axis mirroring.
Have fun, I hope you find this useful.
UPDATED:
Removed the obnoxious camera from view-port center.
Closed some un-needed menus so new people do not get scared from all the buttons.