A demo of the OpenGL implementation of Trender
Being curious about Trender's performance, I searched for polygon
representations of my country, and eventually found the GTOPO30
dataset. Using these data, I coded a real-time
"flight-simulation" over South Greece (including the Aegean
Islands and Rhodes).
On my Athlon XP 1600 (1,4GHz) with a Radeon 9600, I get 35
frames per second for the 2Km map (at 107000 triangles per
Version 1.4 is 3.5 times faster, because
- Manual face pre-lighting
- Optimized mesh
- Compiled Vertex Lists
- Win32 demo by clicking 4Km (350KB) or 2Km (1.2MB).
The first one has sampled the terrain every 4000 meters, the
second one every 2000 meters (if you have a fast CPU/Card, I
suggest the 2Km one).
Needless to say, if you don't have a fairly decent OpenGL card,
be prepared for really slow frame rates (107000 triangles per
- Linux demo here
You still need one of the above Win32 packages for the map
To run it, make sure you have hardware accelerated OpenGL in
your X server and SDL