I was trying to export a scene containing terrain and procedurally (?) generated buildings and roads from Open Street Maps but when I click on File/Export, the menu items are grayed out. I tried right-clicking on a node and exporting to OBJ file but when I tried importing the OBJ file into 3DS MAX, I got an error message. I tried adding FBX Export node but nothing happened.

Nope, not supported.

https://www.sidefx.com/products/compare/ [www.sidefx.com]

I was able to export geometry nodes to OBJ files and import them into Blender 3D. I used MapBox node to create terrain. An image was applied to the terrain. Where can I find the image so that I can create a material for the image in Blender 3D?