Therion and 3D
Therion is able to export 3D model in format .lox based on LRUD data, shape of walls in plan and passage height informations recently. If the map is drawn in correct way these models are quite good. To view the model one should use internal viewer of Therion named Loch. The Loch has feature to export model in the VTK format. And several softwares for manipulating with 3D data for example CloudCompare or Paraview are able to import this VTK format.
CloudCompare is able to export next formats:
BIN .bin CloudCompare own format
ASCII .asc,.txt,.xyz,.neu,.pts ASCII point cloud file (X,Y,Z,etc.)
LAS .las ASPRS lidar point clouds
E57 .e57 ASTM E57 file format
PCD .pcd Point Cloud Library format
PLY .ply Stanford 3D geometry format (cloud or mesh)
OBJ .obj Wavefront mesh
VTK .vtk VTK file format (triangular mesh or cloud only)
STL .stl STereoLithography file format (mesh)
OFF .off Object File Format (mesh)
FBX .fbx Autodesk (Filmbox) File Format
DXF .dxf Autocad DXF format
SHP .shp ESRI Shape file format
RASTER .geotiff, etc. Common raster formats (GDAL)
PV .pv Point cloud + scalar field
PN .pn Point cloud + normals
Sinusx .sx Sinusx curves
ParaView is able to work with next formats:
ParaView files
VTK files
Parallel (partitioned) VTK files
VTK MultiBlock (MultiGroup, Hierarchical, Hierarchical Box) files
Legacy VTK files
Parallel (partitioned) legacy VTK files
EnSight files
EnSight Master Server files
Exodus files
BYU files
XDMF files
PLOT3D files
SpyPlot CTH files
HDF5 raw image data files
DEM files
VRML files
PLY Polygonal files
Protein Data Bank files
XMol Molecule files
Stereo Lithography files
Gaussian Cube files
Raw (binary) files
AVS files
Meta Image files
Facet files
PNG files
SAF files
LS-Dyna files
So you may for example calculate surface and volume of cave - thanks to Filippo Gregori:
Note: If you use a coordinates on the fix point/s as a result could be quite large numbers of x and y coordinates. Because there is a problem (maybe only my) to export such data to MeshLab you should comment the fix point/s before generation of Loch model or subtract the big part of x and y coordinates in ParaView, if you know how to do it (me not till yet :) ).
1) Export the lox file to vtk format
2) With Paraview software I opened the file vtk
3) Save the file as .x3d
4) Open the file x3d in Meshlab software
6) Apply the filter: Filters -> Quality measure and computation -> compute geometric Measures
7) Open log window: View -> Show Layer dialog
8) Read the lines Volume Mesh and Mesh Surface
Or you may print 3D model of your cave system.