Memory usage
| storage | bytes/heixel | notes | |
|---|---|---|---|
| Lindstrom-Koller '96 | block-based, each block is a dual quadtree of vertices | "from 6 to 28" | bottom-up evaluation! |
| Lindstrom 2001 (SOAR) |
interleaved quadtrees | around 53 for pre-process, "20-33" at runtime |
|
| LKTerrain | single block, dual quadtree of vertices | 32 (30 + padding) | top-down |
| TopoVista | single bintree of faces | heightfield + 12 | |
| Treadmarks | implicit binary tree of variance values, runtime binary tree of drawn triangles | heightfield + 1-8, depending on precision and depth of variance bintree | plus 10-20 bytes per drawn triangle |
| SMTerrain | directly based on Treadmarks algo | 3 (heightfield + 1) | plus 20 bytes per drawn triangle |
| Soul Ride | single quadtree of blocks, each block is 3x3 vertices | ~11-14 | the vertices of each block are evaluated as explicit cases |
| Röttger et al. | single quadtree of vertices | heightfield + 1 | |
| SRTerrain | wraps Röttger's libMini in the VTP framework | 5 | fastest available rendering |
| CrystalSpace/DDG | like ROAM | heightfield + 3 | plus 12 bytes per drawn vertex |
| Gizmo3d IRMA | like ROAM | 8-10 |
...
| Grid Size | SMTerrain | SRTerrain | SOAR (includes file IO) |
| 1025 | 0.23 | 1.10 | ~ 3 |
| 2049 | 0.91 | 4.53 | ~ 14 |
| 4193 | 3.74 | 19.3 |
...
Mesh Size Approximate Memory Required SMTerrain
3 bytes/heixelSRTerrain
5 bytes/heixelTVTerrain
14 bytes/heixel513 <1 MB 1.25 MB 3.5 MB 1025 3 MB 5 MB 14 MB 2049 12 MB 20 MB 56 MB 4097 48 MB 80 MB 224 MB 8193 192 MB 320 MB 896 MB 13k*15k
(theoretical)557 MB 930 MB too much