If a backdrop asset has a trainz-build number of 4.1 or higher, I think you can disable its shadow-casting ability by editing its config.txt file. You need to insert the following line of text;
does-cast-shadows 0
into the mesh sub-container section of its mesh-table, like this;
mesh-table
{
default
{
mesh "backdrop.im"
auto-create 1
does-cast-shadows 0
}
}
I think this is valid for both Kind scenery and Kind track assets. In other words, for backdrops listed in either the Objects tab or the Tracks tab in Surveyor.
Be aware that such edits, if allowed by the program, will only be local to your own computer. If you publish a route with these assets to the DLS or elsewhere, other users will end up with the original, un-edited backdrops, so they will still see shadows.
~ Deane
.