I tested this today, to see if it would work. This is what I found, copied from my notes:
Note- this is experimental, please backup any files before you change anything and please report back to let me know whether this works for you, or not.
If you have used the default road in a world, and now wish to have a different road texture, you have two choices.
Either you can replace each road in your world with a custom road, or you can make a default override and import it to the world file.
If you want to do this, first backup your world. Make a safe copy of it somewhere.
To make the default override, you need to export the following resources:
As you can see these are the road texture, sidewalk texture, sidewalk corner texture, crosswalk texture and road detail texture.
Those are all found in the basegame FullBuild0.package ([Game Install Location] \Electronic Arts \The Sims 3 \GameData \Shared \Packages)
You can then recolour these, and then import those to your CAW World file (to be found in Documents \Electronic Arts \The Sims 3 Create A World Tool \UserToolData \Worlds).
Alternatively, if you already have a set of CAW road textures that you want to use, just make a copy of the textures and rename them to the same names as the basegame textures, as listed above. Then import those files to your world. I chose to do this, I just copied some textures from my CAW source textures folder, and renamed them.
That is enough to replace the textures for your world, and if you are replacing the road for a very similar coloured texture, that may be all you want to do. However, if you are using textures that are very different from the default road texture, you will notice that the low-detail textures (the textures you see when you zoom right out) are incorrect, and still show the basegame road, even though you see the new road when you zoom in. If you want to correct this, you have to delete all of the low LOD road textures from the world file (using S3Pe), and then have the game refresh them.
To delete the textures, look at your world in S3PE for any textures labelled _IMG of instance 0x00B2D882. Trouble is, there are a LOT of these, so the easiest thing to do is to scroll through these with DDS preview on, and look for any with the road visible.
In a small world with just a few roads, I had to delete 16 resources. If you have a large world with roads on every chunk, you will need to delete many more than this.
I also deleted the _KEY resource at this stage, to refresh the texture database.
Save the world in S3Pe, then delete your CAW caches. .
Now, you need to make CAW refresh those deleted textures, so open the world in CAW. Change a road- delete one, add one, move one. Then save the world.
Now, when you export your world, the override textures will show up at all levels of detail.
If anyone is brave enough to test this, I'd be interested to know if it works. I only had time to test on a few small worlds, so I'd like to know if it is effective on more complex worlds.
I'm especially curious about regeneration the Low detail textures- do they all regenerate correctly if you just alter one little piece of road? Or, do you have to change a road on each chunk to regenerate them all? If they don't regenerate you'll get a flat brown texture smeared all over your terrain, so you'll soon know! :blink: