How to select UV coordinates for groundcover billboard?

I'm creating groundcover on my new map, and I've run into this:



In the inspector panel, I've found where the UV for the groundcover billboard is defined:



But the coordinate fields are not editable, and I can't find a file where they're specified. The main.materials.json defines the materials, but has no fields to specify coordinates. There is no shapefile for this grass in the Industrial map, where my map's subfolders come from, so this groundcover material doesn't seem to need one.

Who can tell me what files are used to define groundcover, and in particular where the UV coordinates are defined?

 

Coordinate fields are editable: click and slide, double click, or ctrl + click.
File is in levels/your_map/main/MissionGroup/Level_objects/vegetation/

 

Okay, got it. I should have checked for the tap vs. click issue. I work on a laptop, and there are a number of places in the editor where tapping the touchpad doesn't result in an actual click (right or left). I have to use the physical button at the corner of the touchpad. I've got my grass defined properly now, and have identified the UV coordinates entry in the items.level.json file in the /vegetation folder. (Although I swear it wasn't there before. Maybe it only appears after you modify the coordinates. Or maybe I was looking at a different file.)



Thanks for your help.

 

Still having trouble with this. Last time I just used one corner of the billboard and it worked fine. This time I'm trying to use all four corners in different sections of the one groundcover type, but I still get examples using the whole billboard. So I have two quesitons"

Are the coordinates fractional? And is the format x1, y1, x2, y2, or x1, x2, y1, y2? Neither one seems to work.

Right now I have the following coordinates:

[0] 0.0, 0.0, 0.5, 0.5
[1] 0.5, 0.0, 1.0, 0.5
[2] 0.0, 0.5, 0.5, 1.0
[3] 0.5, 0.5, 1.0, 1.0

...which should cover all four corners if the format is x1, y1, x2, y2. But I've got stacked billboards. If I try the other format, it's no better.

 

The coordinate numbers don't "matter", they can be anything. You have to move (1st and 2nd slider field) and stretch (3rd and 4th) the image visually to find the preferred plants.

 

Thanks! I finally have a flat, grassy field with normal-looking grass right beside my steep plunge of death!