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: 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
