Here from my point of view the more easy, totally free, funny and ultra powerful workFlow...Scape
Only direct modeling inside free BricsCad Shape : export in FBX (whitout Scale) Favorite Modeler possible of course! Moi3D!
Reload the FBX inside the Free PConPlanner : use its cornucopia terrific direct Catalog Objects, Textures, Materials
by Drag & Drop ! Save as OBJ
Et voilĂ !
Free models for personal use by 600v, Ixlrlxi alias Rust Shake at https://www.patreon.com/600v
As it's SKP formats use the fabulous Free Pcon Planner for texture and Conversion in OBJ https://pcon-planner.com
Here in the funny and easy Flowscape in 10 seconds...
Not yet tested but seems very cool! :)
Free : Tangram + Google Maps + 3D Builder (free integrated (?) or loadable inside Windows) https://tangrams.github.io/heightmapper/
Tested just with an image! That is terrific of simplicity! One second realised! :)
And at the end you can save in several 3D formats! ;)
I don't know if this has been posted here already, but the skilled coder who created the fabulous MagicaVoxel editor has started working on a new tool featuring Signed Distance Fields. It looks very promising.
Wait for the second half of the video to see the live editing of the model.