0.3.0-preview302

• Version ID: 3839
• Size: 140.96 MB
• Published: 2026-03-02

Changelog

New features, options and improvements

• New functions:

  • New P2P 1v1 race mode: race with a friend without having to set a server using a peer-to-peer connection;
  • Experimental support for servers with client-specified cars and for changing car skins live (some features wouldn’t work for now, update for CM is coming soon).

• Physics:

  • Extra contact points experiment is back and enabled by default, no longer moves contact point laterally so it won’t affect FFB;
  • New physics experiment optimizing colliders for track physics objects;
  • New physics experiment tweaking track physics objects without explicit configuration (CoG fix, a bit of damping, a bit of friction);
  • New physics experiment equalizing pits check thresholds across Assetto Corsa (available online as [PHYSICS_EXPERIMENTS] EQUALIZE_PITS_CHECK=1);
  • New options in general disabling lap invalidation by AI or Physics API;
  • Automatic Sine→Perlin upgrade (affecting invalid surfaces only) now upgrades to Simplex instead;
  • Procedural surface noise better handles multiple tyre rays;
  • A few other improvements for surfaces with procedural noise (better car placement, better ground plane computation);
  • Cars occasionally exploding on certain surfaces fixed.

• AI:

  • Steering is smoother (physically) at speeds below 7 km/h;
  • Trajectories fixed (cautious steering tweak was messing things up);
  • AI debug app now shows actual AI inputs instead of smoothed ones;
  • If the Tweak autopilot switching option is disabled, AI inputs smoothing, as well as some other tweaks, will work properly anyway;
  • RACK_TRAVEL_LUT stops working with autopilot as well (previously, it would stop for AIs to keep them safer, but not for the autopilot making testing more difficult).

• Extended track physics:

  • New COG_OFFSET=AUTO for track object physics parameters applying CoG fix;
  • COLLIDER_DEBUG from custom track object collider parameters removed, replaced with a checkbox in CSP Debug app;
  • New _EXT_PERLIN_NOISE=SIMPLEX for track surfaces to use Simplex noise (basically Perlin but a bit better).

• Audio:

  • New audio tweak: using traction control intensity for its audio volume (enabled by default);
  • Collision audio for hits no longer cuts off, instead, new events are created live;
  • CSP no longer plays hit audio for overwhelmingly scraping collisions, or scrape audio for hitting collisions;
  • CSP ambience audio is no longer affected by doppler shift at all;
  • Mumble voice chat: audio volume fading when talking or listening is disabled.

• New main menu:

  • Better setup titles (let me know if I missed any abbreviations);
  • If any setup tab title has a lower-case letter, CSP won’t adjust case;
  • Leaderboard uses custom driver icons, if set;
  • Look and behavior of disabled setup items improved;
  • Scrolling of setup tabs has been fixed;
  • EXT_VISIBLE_WITH works from the start, not waiting for something to change;
  • Hidden tabs are fixed, no longer can be selected;
  • Tab reset works for more types of tabs;
  • Hold Shift and click on car preview in the main menu to change color in a single-player session.

• Other UI changes:

  • Position of warning icons (the ones in the top left corner) and race flags fixed;
  • Options to disable warning icons and hide racing flags, by default icons hide with Ctrl+H;
  • Center UI option got an extra variant centering apps bar (and tasks switcher) as well;
  • New pause menu: buttons don’t get clipped with photo mode anymore, buttons shift down if the menu has been moved to the bottom half of the screen;
  • Recently added assists editor is optional, with a setting to turn it off;
  • Starting lights shift upwards when the main menu is opened.

• Default Weather FX style:

  • Brightness adjusted;
  • White reference point accounts for post-processing exposure, ensuring the same brightness in different conditions (LCS only);
  • Fog is a bit less bluish;
  • Glare in the virtual mirror is reduced.

• Particles:

  • Piece and spark particles: collisions with track improved, sparks use local heightmap, issue with sparks-car collisions misbehaving fixed;
  • Fireworks use additive blending;
  • Smoke behavior adjusted, positional variance no longer applies to most smoke types;
  • Velocity of flame particles in track configs with flame intensity above 1 fixed;
  • Particle sizes adjusted: pieces have a small chance of being large, flames are larger if fast.

• Grass FX:

  • Localized randomization no longer jumps with origin shift;
  • Shading improved;
  • Grass disappearing for a frame with origin shift in OpenVR mode fixed.

• CSP Debug app:

  • A checkbox showing outlines for track physics objects fixed;
  • Dragging improved: forces are critically dampened to prevent oscillations, multiple cars can be dragged at once, track physics objects can be dragged as well;
  • Click-to-teleport is merged with dragging, allows to orient car;
  • Dragging tool allows to push or pull the car as well.

• Hotlap with multiple ghosts:

  • Laps done with AI (with AI lap invalidation disabled using the new option) are marked;
  • Copying of the best record to the place where AC would originally store a ghost is fixed, now includes layout ID.

• Miscellaneous:

  • VR tweaks: options Custom VR HUD and Skip post-processing are enabled by default (it just looks so much better this way, and it’s compatible with LCS too);
  • AC no longer raises an error with empty aero.ini;
  • Other fatal AC errors are shown properly;
  • Blown tyres of remote cars affect wheels positioning with custom motion enabled;
  • Remote cars: angle of front wheels got a tiny bit of smoothing, fix for steering wheel angles range improved;
  • CSP shows a warning if a Lua script takes more than a second to do something;
  • If country name is missing, tooltip for its flag in chat will be hidden;
  • Nice Screenshots: accumulate HDR summation is marked as not compatible with scriptable filters, will be paused when filters are active;
  • Snow/ice definitions for ek_akina_snow;
  • Timezone for rt_lime_rock_park fixed, added heading angle;
  • AC timing with fewer than four cores, or with multithreading disabled, improved;
  • Vintage scriptable filter: small update reducing dithering;
  • Show important steering wheels tweak improved;
  • Old tweak getting dynamic object balloons to move with wind has been fixed and improved;
  • Slightly improved taskbar closing behavior;
  • Disable Steam interface option renamed and reset, in case somebody enabled it by mistake (now, CSP won’t offer to activate it anymore);
  • Neck FX temporarily pauses photo app FOV slider when changing FOV, for both to work better together and fix some issues with other components;
  • Hotkey to toggle virtual mirror can be changed (CM update allowing to bind F… keys is coming soon);
  • Active Steam overlay stops mouse hovering effects of IMGUI;
  • With CSP flames enabled, original flames no longer waste time looking for textures;
  • Rendering debug: new option forcing informative crashes on D3D11 errors;
  • Crash reports are detailed by default, compact ones are pretty useless.

Fixes

• Linear color space: speculars fixed;
• Some track physics objects missing on any collisions fixed;
• The crash caused by missing cache subfolder meshes_metadata is fixed;
• IMGUI: fallback fonts fixed, rare characters should work in titles and such;
• Shadows computing now takes base surface normal into account as well, fixing an issue with the main building on Spa;
• A few issues causing GPU to crash (related to navigators, particles, filters, car swap and more) have been fixed;
• Some of NaN rendering glitches with refracting headlights fixed;
• Fixed some crashes with cars with encrypted colliders;
• Visual tyre wetness and AI alterations getting stuck on rain deactivation fixed;
• Surfaces FX audio fixed.
• Issue with wheels increasing in size online without custom motion in long races fixed (I would highly recommend to enable custom motion though);
• Analog odometers no longer break some textures with HDR enabled;
• Car LODs acting strange with 20+ cars in a frame are fixed;
• Decoding of animated GIFs fixed;
• Misaligned colliders of some track physics objects on Barcelona fixed;
• Walking Out: pause is working correctly when walking around;
• Synchronization of dynamic objects across clients online fixed;
• Borderless AC window saves its size and position properly;
• A couple of core fixes to prevent memory corruption happening in some rare cases;
• A few crucial fixes for memory profiler;
• Headless mode disables all the input (keyboard, gamepad and wheel), few other fixes;
• Fallback LOD no longer takes a frame to appear if other LODs are available;
• Flashing for jumped cars, or from ac.highlightCar(), fixed, shouldn’t affect grass anymore;
• Resetting extrapolation of remote cars on teleports slightly improved.

Configs

• Car & track configs:

  • New [TYRES_FX] RADIUS_OFFSET parameter allowing to alter visual radius of tyres;
  • Glass materials: new NormalMapUVMult parameter;
  • Brake Disc FX: compute of default value for CERAMIC adjusted to make them less frequent;
  • A few improvements for live car config reloads;
  • BLIND_SPOT car input and ac.getCarBlindSpot() fixed, now returns distances to the cars in front (as Z) and behind (as W) as well;
  • [DATA] DI_…_… modifiers for digital instruments can use BASE instead of an index to affect all of them;
  • [DATA] DI_…_ALPHA affects first version of text nodes as well;
  • Track conditions tool shows input values as well;
  • New [BASIC] SEASONS_DEACTIVATION_AWARE=0 to fix tracks that don’t expect YEAR_PROGRESS to be -1 when season changes are disabled, on by default for all but dousojin_touge and dousojin_touge_1990;
  • Box guessing for track object colliders (trying to replace a mesh with a box with custom track physics) improved.

• Extended configs for online servers:

  • Use [CUSTOM_PHYSICS] EXTRAPOLATE_STATE=1, 1, RAW to try a new approach to avoid shaking;
  • Use [CUSTOM_PHYSICS] SMOOTHING_FACTOR=100 to make movement of remote cars more snappy and less smoothed (lower value for smoother movement, default value is 250);
  • Add [EXTRA_DATA] VR=1 to sync the state of drivers using VR (requires AssettoServer);
  • Use [EXTRA_RULES] ALLOW_PITS_JUMP=1 to allow jumping in pits by holding Ctrl and clicking on car preview;
  • Set [PHYSICS_EXPERIMENTS] EQUALIZE_PITS_CHECK=1 to equalize thresholds of AC checking if car is in pits or not (experimental);
  • Jump limit slightly improved, more sensitive to jumps side-to-side, default time reduced from 5 to 2 seconds, flashing is only present if the car intersects another car, cars no longer flash if collisions are disabled via Physics API.

Lua & Python

• Common API:

  • New properties for ac.StateSim: .isTrackOpen, .isTimeOffsetIgnored, .timePostOffset, .timePhotoModeOffset, .isAltOnlineRace;
  • New ac.checksumCRC32();
  • New string.urlDecode(), string.urlParse() and string.xor();
  • New mat4x4:getEuler() returning Euler vectors from a matrix as a counterpart to mat4x4.euler() creating a matrix from Euler vectors;
  • ac.INIConfig.parse(): use @car:N as include folder for read() expressions to work as well;
  • New ac.getAssists();
  • New ac.onCarSwap();
  • Function ac.areShapesColliding() fixed: debug outlines for cylinders and capsules are aligned correctly, car colliders account for graphics offset, new physics.Collider.Track() allowing to check for collisions with the track;
  • New ac.getCollidingShapesContacts() returning actual contact points;
  • New argument for coroutine.create() for flags: raise errors, start coroutine immediately;
  • New insideCar:yes, actsAsLED:yes and actsAsAnalogInstrument:yes queries Scene API;
  • Functions raycasting physics geometry got an argument for taking procedural noise into account;
  • New coroutine.sleep();
  • Coroutines support improved (please report any malfunctioning functions).

• Shared libraries:

  • New shared/promise with a custom fast JS-like Promises implementation;
  • New shared/utils/ntp library for querying precise time using NTP protocol (can help with syncing for alternative online modes);
  • New shared/utils/luasteam for full access to Steam API available to all scripts with I/O access (forked version of luasteam with a few more functions and a bunch of small fixes);
  • New shared/utils/parcel for exchanging small bits of data;
  • New surfaces.raycastDetailed() in shared/sim/surfaces;
  • shared/utils/signing: new signing.check(), new {CSPVersion}, {CSPVersionCode} and {UniqueMachineKeyBase64Trimmed} for signing format string, queries to quickly and easily verify integrity of cars and tracks, as well as AC’s surfaces.ini, verify function can handle absolute paths, other fixes;
  • shared/sim/fireworks library is more responsive.

• Render API:

  • New main.smoke render event for render.on();
  • render.circle() and others: argument for white reference point brightness correction.

• I/O API:

  • New io.compress() and field compress for io.extractFromZipAsync() for applying NTFS compression, remote_assets files are compressed by default;
  • io. functions accessing file times (such as io.lastAccessTime()) can be used to change file times as well now.

• UI API:

  • Horizontal thin scrollbars (new argument for the function, or, you can use bit.bor(ui.WindowFlags.HorizontalScrollbar, ui.WindowFlags.ThinScrollbar) for a window with horizontal scrollbar);
  • ui.progressBar(): pass math.nan for progress for indeterminate progress bar;
  • :linkToSimulationSpeed() of GIF players fixed;
  • Using ui.unloadImage() now lets CSP unload dynamic::hud::redirected::N buffers if unused.

• Gameplay API (available to apps, online scripts and more):

  • New ac.resetDynamicTrackObjects() in Gameplay API allowing to reset dynamic track objects;
  • New :redirectLayer2() returning duplicate flag as well, :redirectLayer() is deprecated;
  • ui.registerOnlineExtra(): argument to set a tooltip message.

• Game API (available to apps and New Mode scripts only):

  • New ac.setTrackCoordinatesDeg2() (ac.setTrackCoordinatesDeg() is mixing up X and Y of coordinates);
  • New ac.debugTrackColliders().

• Lua apps:

  • New ac.sendKeyboardButtonEvent();
  • ac.getSetupSpinners(): new visible field;
  • New ac.getSetupTabs().

• New Modes:

  • New experimental ac.overrideSession();
  • New [TWEAKS] ALT_ONLINE_CARS=<number> adding extra remote cars that can be driven by the script, with a new shared/sim/altonline library to control them, as well as other values allowing to create proper custom online modes and more, see p2p-1v1 for an example;
  • New [TWEAKS] DYNAMIC_TRACK_OBJECTS_SEED overriding random seed used for arranging track objects;
  • Add [TWEAKS] VERIFY_STEAM_API=1 for CSP to check if Steam is actually available at the launch;
  • Manifests of New Mode scripts can use INIpp features, allowing to do things like activating tweaks based on race.ini or settings.ini;
  • Scripts can access ac.startBackgroundWorker().

• Physics API:

  • New physics.setPenalties(), physics.setWrongWayPenalty() and corresponding state fields in ac.getSim() (also, .allowedTyresOut updates live properly);
  • New physics.setAssists() and ac.onAssistsChanged(), physics.setAssists() can also be used to block out assists editing;
  • physics.RigidBody(): alignment of debug outlines for cylinders and capsules is fixed as well;
  • physics.overrideRacingFlag() works better if called every frame;
  • New physics.getTrackObjectStatus(), physics.getTrackObjectPointVelocity() and physics.addTrackObjectForce() for physics workers;
  • Enabling AI for cars online fixed;
  • Logic for laps invalidation caused by usage of these functions slightly improved, invalidating less often, no longer invalidating when applying to AIs in offline races.

• Car physics scripts:

  • New ac.addCosmicForce() and ac.addCosmicTorque() for adding forces to cosmic suspension;
  • Physics debug lines: brightness fixed, .mult of rgbm is taken into account, option to draw a dashed line.

• Other script-related changes:

  • Lua profiler updated, cleaner and more informative, no longer freezes AC;
  • Lua Debug app: texture viewer no longer conflicts with Objects Inspector, graphs for ac.debug() with number adjusted;
  • Calling script.asyncUpdate() is temporarily disabled until I figure out why it explodes at the start once in a dozen of runs;
  • Docs for states fixed, 0-based arrays use custom tables instead of array syntax to improve compatibility with Lua Language Server plugin;
  • Some of LuaJIT functions, especially the ones returning complex entities like INI files, should be faster;
  • New Python function ac.ext_isLapInvalidated().