This link may help explain a bit about heightmaps and how they work.

It's not GameStudio related but it explains about how they work.

I'm sure GS uses the same principle.

Info about heightmaps.


Windows XP SP3
Intel Dual Core CPU: E5200 @ 2.5GHz
4.00GB DDR3 Ram
ASUS P5G41T-M LX
PCIE x16 GeForce GTS 450 1Gb
SB Audigy 4
Spyware Doctor with AntiVirus