In ArcScene, the interactive "Create Contour" tool of 3D Analyst does not create a contour. It works for a TIN derived from the same raster. It works for the same raster in ArcMap. Toolbox/Raster Surface/Contour works just fine. Any ideas?
from the help topic.... http://desktop.arcgis.com/en/arcmap/latest/extensions/3d-analyst/fundamentals-of-the-interactive-3d-...
It says
Interactive 3D Analyst tools in ArcScene
The interactive tools on the 3D Analyst toolbar in ArcScene can be used on a TIN or raster surface:
but there are some sublinks. Like the obvious... toggle on the 3D analyst, but check just in case something applies in your case
I think I'd already found/followed the advice you pointed me to (thanks!), but to no avail.