Do the following steps:
1. Start FPSC.
2. Click on File and then click on Open.
3. Double Click on the folder named "samples."
4. Double Click on the map named "WaterRoom."
5. Run the test level and play in the water.
6. Before your finger tips get all wrinkly, exit the level.
7. Notice the trigger zone in upper left corner of map.
8. Right click on the trigger zone to bring up the parameters.
9. Notice that "Main" has a waterscript assigned to it.
10. Using FPI EditPad or Notepad load the script waterscripts/water.fpi and study the script.
Two things to remember. One is that the water will always cover the whole level. However, you make adjustments using the water height command. Setting it to zero will make the water as high as the trigger zone. This is where it is set in the water.fpi script. Change this number and test it out.
Use RPG Mod and create a world filled with adventure!