I use McNeel's Rhino program to import the OBJ file and then I can make 3D elevation, 3D slope and 3D contour maps and even automatically identify trees and their types (evergreen or deciduous). I created a GUI in Python to enable easy selection of map type, data range and coloring options.
Rhino Python Drone Maps GUI > Click on picture to see details.3D Elevation Map
Click on Map to see details.
3D Slope Map Notice the driveway has 2% slope (1/4" per foot) as designed. Click on Map to see details.
3D Contour Map 1' = Grey, 5' = Red, 10' = Orange, 25' = Yellow, 50' = Green, 100' = Blue
The 1' line below each 5' line is black to help indicate the downhill direction in flat areas.
Lots of trees in the map. Click on Map to see details.
The code is about 3800 lines of Python which I wrote. If you like programming and want to give Rhino a try, I will send you the code for your use, modification and to give away as you like. I am retired and not looking to provide significant support but I am happy to share what I have. Rhino 6 is just coming out and is a fraction of the price of many other programs (under 1k). But it only works if you like programming. I am very happy with the results I am getting. Much better than I ever expected when I started 3 months ago with DroneDeploy. Double-click on my S circle and look at my Top Topics for other posts with more details.