Setting Visibility of ArcGIS Elevation Source and/or ArcGIS Image Elevation Source

[piercze]

I have the ability to hide/reveal all kinds of Layers with Input Events (Tile, Vector, 3D, etc). 
I also figured out how to use Mesh Modification to hide/reveal specific areas of the map layers. This is very handy.

But I cannot control the rendering or visibility of my Elevation Sources. I'm trying to make an Image Layer 0.3 opacity, so that you can see downward through the layer into the subterranean areas which is full of spawned mesh actors. But the Elevation Source prevents transparency. Disabling it disables the elevation of course, and there seems to be no kind of 'Set Is Visible' node for it.

Any ideas? I'm using BPs in 5.2

[piercze]

This does not appear possible, because  most material properties are not accessible from within Unreal. I don't think it's possible to access these properties even with C++ because they seem to all come via API.

Is the only option to author layers in ArcGIS software with the desirable material properties, and then call them into UE? Would translucency authored in Pro render as translucency? Is there a way to call an 'invisible' elevation source?