[GRASS-user] 3D geological modelling

[Hamish]

Phillip wrote:
> You can create some tins in grass but it is a bit
> of a pain and they cannot enclose a 3d-volumn. 
> And now for the real geology-grass problem.  Grass
> is only 2.5D.  Thus you can have a polygon with
> z-elevations but one node cannot directly overlie
> another node.  Grass has topology.  Thus it is a
> bit of a problem with modeling geology.  At least
> the last time I tried it.

In GRASS 6:
- The r.* modules are 2.5D.
- The new r3.* modules support full 3D rasters (voxels).
- The v.* modules support full 3D points and lines with topology.
  Nodes can overlie each other.
  Infrastructure for vector volumes is in the code but there isn't
  much beyond NVIZ visualization written for it yet. (faces, kernels)
- NVIZ will handle both 2.5D and 3D rasters and vectors.


check out  http://grass.gdf-hannover.de/wiki/Help_with_3D



Hamish