By Ephtracy the Autor of MagicaVoxel (so same ergonomy for the render! :)
Aerialod (free)
An interactive path tracing renderer for height maps.
support rendering height maps of size up to 16384^2.
support importing and exporting 8-bit and 16-bit png images
I am waiting the Strereographic projection (buttons are existing! ;)
For make maps of displacement 8192*8192 or any automatic "square" textures...
Works like a charm with Aerialod above! (16 384 * 16 384)
I am not sure that PLY format only existing for the moment is very useful because file size result is 2 - 3 gigas!
for the little one following!
I suppose that in the future there will be a more simplified OBJ result!