Tractor Terrain Dynamics

v1.0.3.8

IMPORTANT
The previous version had a bug: surface states would get stuck, causing
vehicles to behave strangely — both on fields and on natural surfaces
(grass, dirt, etc.). This has been fixed in v1.0.3.8.

FIXES
- The mod works on dedicated servers again.
- Server and clients now correctly share surface and vehicle state data.
- Switching between field / natural / road / object no longer gets stuck.
- After leaving grass or dirt onto a field, the sliding gradually returns
to normal over a couple of seconds — no more sudden stuck slip.
- Vehicles without a driver, without active work and without active
surface interaction are no longer processed every frame — less load.
- The calibrator now shows only the pages that actually affect physics
in the selected mode. No more twisting sliders that do nothing.
- The calibrator now properly affects tractor slip when working with
a trailer or a seeder.
- Trailers and seeders now pass their resistance on to the tractor.
- Tractor slip is calculated when it pulls a trailer or an implement.
If the tractor drives on its own — slip is minimal, since it isn't
pulling anything.

NEW
- Wheels now leave tracks and break up natural surfaces
(grass, dirt, sand, gravel).
- Breaking only works if deformation is enabled in the settings.
- Broken roads are repaired manually — using the normal in-game
terraforming tools for in-game money. Nothing repairs itself.
- Deformation on/off is in the game settings menu, right where
difficulty and surface mode are.
- Mod settings (difficulty, surface mode, deformation) can only be
changed by the host or master user. Regular players can see them
but cannot change them.
- New mode: "Roads only".
On fields, TTD physics is completely turned off — the game behaves
like vanilla, no slip, no sinking. But on grass, dirt, sand and gravel
TTD keeps working and keeps breaking them up.
On fields the HUD shows values from TTD's own settings — for
information only, they do not affect field physics.
This mode is handy if you play with another field physics mod,
or simply don't want to slip on fields.
- The calibrator also supports "Roads only" mode — grass/dirt settings
are available, and if deformation is on, deformation settings too.
- If TTD is your main physics mod, you can use any mode.
"Field" and "Field + roads" should not be used together with other
physics mods. If you play with another field physics mod, switch TTD
to "Roads only".
- There are more setting combinations now — everyone can find what
suits them. Examples:
• Don't want to slip on fields → "Roads only", deformation off.
Fields behave like vanilla, grass and dirt are untouched too.
• Want slip on grass, but don't want to touch fields or roads →
"Roads only", deformation off. TTD stays out of fields, slip and
resistance work on grass, roads stay intact.
• Full hardcore: fields, grass and broken roads → "Field + roads",
deformation on. Everything works, grass and dirt get broken up
by wheels.
• Playing with another field physics mod, but want grass and surface
breaking from TTD → "Roads only", deformation on. TTD doesn't
interfere with the other mod on fields, grass and roads are
handled by TTD.
- IMPORTANT ABOUT TIRES: tire physics always works, regardless of
difficulty and mode. Narrow tires slip more — they already grip
the ground worse. Duals, twins and tracks grip better. This is
by design from the start: tire type directly affects how the
vehicle behaves.

ABOUT THE CALIBRATOR AND SLIP
The slip slider in the calibrator is not an "on/off for wheel spin".
It does not directly make the tractor slip or not slip.
Slip depends on how much the tractor is pulling (trailer, seeder,
plow), on the ground, on moisture and on the tires. The slider only
adjusts how strongly all of that is applied through resistance and
grip. If the tractor drives on its own — it barely slips, no matter
where the slider is. If it pulls a heavy trailer through wet mud —
it will slip, and the slider will make it stronger or weaker.

https://youtu.be/dMFg85YvGMU?si=6Q4WilzziJPHLQMP

* Added built-in calibrator for fine-tuning the behaviour of each tractor directly in-game

* TTD Calibrator Description (RU/EN/DE/FR/IT/PL):
https://drive.google.com/drive/folders/1sLNXcLPwPgm9MTGft8uRE2Zen2v-SK-Q?usp=drive_link

* Tracked vehicles now leave ruts just like wheeled ones
* Completely reworked the wheel sinking system - behaviour is now noticeably smoother and more predictable
* Fixed an issue where moisture on grass and other natural surfaces was displayed incorrectly
* Tracked vehicles now behave differently from wheeled ones - tracks sink less, slip less and recover more easily
* Front wheels of tractors now sink slightly less than the rear ones - just like on real machines
* Fixed a bug where engine settings could fail to apply to some vehicles
* Each vehicle now stores its own settings separately and does not affect others
* Removed unnecessary calculations that could cause frame drops when many vehicles were present on the map
* Improved overall performance - the game now runs more steadily
* Cleaned up some old and unused parts left over from previous versions
* Updated default difficulty values - they are now more balanced
* HUD now hides together with the in-game interface - the separate toggle button has been removed
* HUD values now match the actual physics
* Minor fixes in the interface and settings menu

TTD v3.6 BETA - Natural Surface Support

This is a BETA version for testing. If you just want to play, download the stable version from ModHub or KingMods - select version 3.5.

What's new in this beta:
TTD now works on natural surfaces outside fields (grass, gravel, dirt roads, forest ground)
Reduced grip and increased rolling resistance on these surfaces
Wet conditions affect traction
Asphalt and concrete remain unchanged
What we need from testers:
Test on different surfaces: grass, gravel, dirt roads, forest paths
Test in dry and wet weather
Test with and without UseYourTyres (UYT)
Test with loaded trailers or heavy equipment

Please leave feedback in the comments:
Which surface were you on?
Was it dry or wet?
Was the slip too strong, too weak, or just right?
Did you have UYT installed?

Known issue:
With UYT and heavily worn tires (50%+), slip may be excessive. We need your feedback on this.
Your feedback will help us improve the mod. Thanks for testing!

Fixed:

Difficulty now saves correctly (was broken in 1.0.3.4 - my fault, I missed it during testing)
HUD position now stays within screen bounds at any UI scale

Removed UYT dependency — all mods (UYT, Tire Pressure, More Realistic, Moisture System, etc.) are now optional

Big thanks to all players who helped test TTD, and special thanks to:

- Sinterra
- FirenzeIT - Italian translation
- Tontzu
- ticho

Thank you so much for your help!

What's new:

-Difficulty picker (Easy/Medium/Hard) right in the game settings menu
-Difficulty sticks to your save and syncs in multiplayer - no more random resets
-Public API for other mods (getSharedData, registerIntegration)
-Wheels dig in properly under load with speed-aware sinking

Improvements:

-HUD actually scales now - looks the same on 1080p, 2K, 4K, whatever
-TTD keys show up in the Controls menu so you can rebind them

Bug fixes:

-HUD position saves and restores correctly
-Wheel radius recovery on multiplayer servers
-hitchLiftFactor syncs when clients connect
-Physics cleanup when resetting/deleting vehicles

Other:

Manual — HTML, 3 languages EN/DE/RU https://drive.google.com/file/d/1wxbQOC8sOlJvhRgshQd2EFaD00tbQ9LL/view?usp=drive_link

FS25_useYourTyres listed as dependency
Updated screenshots with HUD icon guide

Moisture:
Global moisture is map-wide, saved separately
Wetting/drying rates vary by ground type
Plowed soil dries slowly, asphalt dries fast

Two-point hitch:
Drawbar raises/lowers in sync with wheel sink

Potholes:
Generated when driving onto a field
Depth depends on terrain (low spots = deeper)
Grow faster on wet ground

Optimization:
Idle vehicles no longer calculated
50+ vehicles = 50 FPS

Saving:
Global moisture saved separately from vehicles
Old saves are compatible

Compatibility:
Removed Variable Tire Pressure - was conflicting with TTD

Removed duplicate configs

TTD v3.1 - What's New

Realistic differential. Your tractor now pulls to one side when one wheel is on soft ground and the other on hard ground. Just like real life - the machine doesn't just spin dumbly, it behaves differently depending on what's under each wheel.

Smarter implement hydraulics. Some implements (Horsch, Maestro) used to lift the tractor when the wheels sank in. Now the hydraulics work in float mode - the implement stays on the ground and the tractor doesn't get jacked up.

Smooth field/road switching. No more jittery physics at the edge of a field. The tractor knows clearly whether it's on a field or on the road.

Trailers and implements don't lose connection. No more crashes when deleting a tractor, and physics updates instantly when you attach or detach.

Performance boost. The mod is lighter now - less CPU load, fewer checks every frame. Your FPS won't suffer.
AI tractors now feel the ground too. Bots sink into plowed soil and slip just like you do. Fair physics for everyone.

Multiplayer support enabled — mod now fully works on dedicated servers
Fixed moisture behavior when game time is paused
Fixed tyre wear synchronization between server and clients
Fixed ground type detection reliability
Fixed manual — all pages now display correctly
HUD: new icon order — moisture, sink, grip, resistance, tyre wear
HUD: sink (wheel sinking) now displayed instead of season
HUD: grey tyre icon "NA UYT" when UYT mod is not active
Physics: ground resistance now depends on wheel sinkage, not directly on moisture
Physics: wheel slip now depends on sinkage, tyre type and tyre wear
Physics: reduced ground resistance for stubble, cultivated stubble, post-harvest and other post-harvest field types
Physics: maximum wheel sinkage increased to 25% (was 20%)
AI: wheel sinking now works when AI is driving
Improved overall network performance