Hi Jochen,
I just grabbed the most recent LAStools release, below is the console output. Different set of sample tiles than the previous test I did, so now it is looking for the vertcs.csv.
D:\_test>blast2dem64 -i *.las -keep_extended_class 1 2 9 40 -kill 100 -merged -odir _grids -o test_out.tif -v
LAStools BLAST blast2dem (by
in...@rapidlasso.de) version 250304 (commercial)
step size was unspecified. set to 1.
llx/lly unspecified. set to lower left bounding box 452500/8.723e+06.
terrain finalization (using 2d quadtree) to level 8 with empty 0.
have bounding box. first pass not needed.
second pass: populating finalization counter grid ...
WARNING: cannot open [C:\LASTools\bin\serf\blast\serf\geo\vertcs.csv]. please check your installation.
ERROR: unknown vertical EPSG code in '-vertical_epsg 9001'.
second pass: done. created 51223 leaf grid cells and stored 51223 sprinkle points
spfinalizer: needed 3.375 seconds
created parent grid cells (new total is 68582 cells)
third pass: using finalization grid to spatially finalize 14323830 points...
output precision is float ...
third pass: done. stored at most 19525842 chunked points (plus 51223 sprinkle points)
spfinalizer: needed 12.46 seconds
duplicate_points 102
spdelaunay2d: needed 12.456 seconds
read 14323830 points. produced TIN with 14323728 vertices and 28647341 triangles
WARNING: set nverts 14323830 but v_count 14323728
took 15.883 sec to create '_grids\test_out.tif'.