2nd attempt. Using this video as a guide. https://youtu.be/YNtKnmRXVlo
Get Blender v.2.9 or greater. Install.
Go here: https://github.com/domlysz/BlenderGIS
download the code as a Zip file.
Install from Blender. via Edit/Preferences/Add-ons/ Use the Install button, navigate to the downloaded BlenderGIS .ZIP file.
select the addon after installed and confirm a temporary cache directory.
You may need to install GDAL for all the features of BlenderGIS to operate.
Go through the video to see how to link to GE, Bing, OSM images servers much in the same way Mfds do.
Notice the direct link to the SRTM data for elevation.
Once you are familiar with this, then try and export an image/surface of Mfd9 elevation data to a .TIF format.
Import this into Blender through the GIS feature. Also try and import an example shapefile from Mfd9 into it. I used contours generated from the image.
There are many other tools out in the world that could help. I remember one such DEM2WRL tool that took USGS DEM files and output to .WRL. I haven't shaken the internet to collate the links to these. I just know that there are a few out there with more every month.
Play. Have fun. Learn about blender objects, like camera, lighting, key-frames, animation. Make a simple fly through. As long as I know I can get data in and out of Blender and Manifold(s), then I am comfortable with the compositing of both applications.
(IMO, the 3dViz in Manifold is and has been strictly for presentation, akin to Layouts. Layouts have a good workable foundation. I would like to see more (continued) work in the structural and functional development of data preparation for presentation such as layer zoom scale constraints, Grid/graticule/tesselation forms, easier microimage copy/paste. I also see a big need for the elephant of label generation, placement, adjustment. No. I haven't composed a suggestion email regarding these yet. yet.)