# What happened
Have a 1x1 tower in the pasture with a rope bridge going from the 2nd floor level over to another tower on top a building, so the bridge is between two almost flat points while the pasture is on a hillside and slopes down below the bridge. Animals would end up on the bridge every now and then, at one point even wandering to the building tower end of the bridge then falling down onto a roof section.# What you expected to happen
Not have cows and bulls climbing ladders, in this case "jumping" up onto the bridge
Some quick notes, bug is likely same one causing an animal to go through locked doors etc. like in Horse jumps on bridge. - Server Bugs - Wurm Online Forum, except I'm solely looking at how the animals end up on the bridge itself as there are not gates/doors at either end of the bridge.
Bridge setup is seen by first image in https://imgur.com/a/cdEELUK
# Steps to reproduce
For all images refer to above link.
Have a rope bridge connected to 2nd floor level of a structure above someplace animals roam such as a pasture.
Is my case there's a 6 tile long rope bridge going west from a 1x1 tower, all walls on 1st floor of tower are arched wooden with a ladder to climb up the bridge. No fences/gates on 1st floor.
The 2nd floor where the eastern end of the bridge connects, has fences along the north/east/south sides, and no gate along the western edge going onto the bridge.
Referring to image #5 from above link, (pretend the wooden fences don't exist for now) north is off behind my character as seen by yellow annotation, the blue numbers are the tile slope, and blue square is problem area.
If an animal wanders into that blue square from any direction except due east(the green arrow) they will end up on the bridge as seen in image #2. When using a tamed animal commanding them to go from point A to B, such as north to south through that blue square, unicorn would "jump" onto the bridge then "fall" back down on the other side. Same thing would occur when animal is being lead, player could walk away causing animal to "fall" back to the ground. This can even happen when animal is being ridden seen in image #3, and as prior examples after riding out from under bridge animal goes back to under the player.
Important note: When being lead or ridden the animal would still be "tethered" to the player and not remain on the bridge even after "jumping" up there long as player got out from under the bridge, unless the player stopped leading or riding the animal while the animal was on the bridge above the player, then the "tether" gets broken. It's when the animal wanders on their own they remain on the bridge.
# Fixes
Adding the wooden fences as seen in image #5 as the problem in my case is a portion of a tile not just the border between two. Adding the first fence section under the arched wall of the tower reduced the number of directions an animal could come from to get on the bridge, but not all of them. Only by fencing the entire tile was I unable to get my unicorn to "jump" up there either when riding or when commanding "go from A to B" as she'd go around the newly fenced tile. A bison was wandering around shortly after I added the fences and was stopped by them on what otherwise would have been a path resulting on him getting onto the bridge.
Exception, if I was leading an animal and ran around to other side of fences making them clip through then "jump" up then "fall" back down as I kept walking, but this required player involvement to cause and would immediately fix itself. Not an issue for the grazing cow as she wanders about.
Another fix would be a steeper slow seen in image #4 as once halfway into the tile heading down the slope, the bridge is now high enough the unicorn wouldn't "jump" up there like back in image #3. There is a different, and shorter rope bridge off the 2nd floor of another building with the tile below 1st tile of rope bridge is a slope of 25 on one side and 40 on the other, between that slope and a solid wall under end of the bridge I was never able to get an animal to "jump" onto the bridge even when riding around right next to the wall.
#Prevention/conclusion
Not use rope style bridge over animals unless it's high enough above the ground. There's a 2nd rope bridge off that same 1x1 tower but up on the 6th floor and I've never found an animal on that 2nd bridge. If the ground is steep enough below the bridge it does look like a rope bridge could go from a 2nd floor and be fine.
Problem does seem to be unique to rope bridges, with arched wooden/stone ones I couldn't get an animal to "jump" onto it but didn't spend a ton of time testing those bridge types.
#Additional info that may/may not be relevant.
Slope between pasture tower and tower on building is -94 down across 6 tiles. The western end of the bridge as it connects to the building is -4 dirts lower than the eastern end.
When walking through blue square in image #5 along north/south path, animal still "jumps" up even after adding fence below the arched wall, makes me think wall type (open or solid) doesn't matter and it's simply height of rope bridge above the ground as determined by what floor bridge connects to, length of bridge and slack, and ground slope below.
