The concept is very simple. All you are trying to do is create a new multi image dds file to overwrite the existing grass file in a new vegbank folder.
I accomplished this using paint.net only.
To keep this example simple I will use the vegbank folder named grass 01 (any vegbank folder will work.)
First you need to copy The vegbank folder named grass 01 then rename the folder to grass 01b.
Grass 01b will contain the same files as the grass 01 folder (grass and grass.x), do not change either of these file names.)
Open paint.net and select new, and set the size to 512x512 and make the background transparent.
import the grass file from the new grass 01b folder. This will be your base image.
Import from any vegbank folder the dds image file and overlay the image already in paint.net. (grass)
You can import dds files from several different vegbank folders if you like.
You can do several image manipulations of each individual image (hue, saturation, contrast) if desired)
When satisfied with the paint.net folder image, save the complete overlayed image to your new vegbank
grass 01b folder as Grass.dds
In an existing map change (TAB,TAB) the vegetation type to grass 01b and bingo new grass image, this image will be your new grass brush.
Quote: "this still limits you to the same mixed grass all over"
Note: if you also save the image as a paint pdn file before saving as a dds you will be able revise the image in the future with out starting over.
If a video would help just let me know.
This method only requires a new dds. image file saved to the copied / renamed vegbank folder. The x file does not need to be fooled with.
The new dds file needs to be saved with the same dds name file that is in the copied /renamed vegbank folder. In this case "grass"
All of the vegbank folders that come with GG contain two files named, "grass and X" over write the grass.dds file with any dds image on a transparent
background of the same size/dimensions and you have a new grass texture. the x file knows what to do with the image with out any help.
Windows 10,64 bit|AMD FX-6200 Six-core-3.Ghz |CPU PASSMARK 6,142 |Memory 10GB |NVIDIA GEFORCE GTX 660 SC |GPU PASSMARK 4,114