BBS FS

## IK (Inverse Kinematics)

* Added **Pole target** to IK  
* Added **Bone constraints** to BOBJ models  
* Added IK track and separate tab  
* Added **Tip follows target**, an option that automatically aligns the last bone in the IK chain  
* Added new preset for bended models for default IK setup  
* Moved IK influence transition to IK track  
* Fixed long IK chains  
* Rewrite the IK system (full rewrite). It now works correctly and predictably (just like in Blender)

## Physics

* Added physics track and separate tab  
* Added **Stiffness** option to the physics settings  
* Improved handling of collisions with the physical bone chain limiter

## Texture editor

* Added copy, copy merged, cut and paste layers (both as context options and keybinds)  
* Improved selection preview performance  
* Fixed **Select bounds...** not accounting layer offset

## Models

* Added multiple texture support to OBJ (`.mtl` only) and BOBJ  
* Added texture tracks in Model properties for individual material  
* Added **Show disabled bones** option that allows disabling model’s `disabledBones` feature  
* Changed **Pick texture...** to offer materials when present

## Particle editor

* Added layout system  
* Added multiple panels (viewport, MoLang, general, emitter, particle and appearance) with layout preset system  
* Added `Ctrl + Tab` to cycle panels  
* Added direction XYZ rotation modes  
* Added camera facing modes  
* Added preview for specific MoLang expressions (replaced buttons)  
* Added icon switches (replaced buttons)  
* Fixed parametric and dynamic to be separate for rotation component

## Gizmo and transformations

* Added arcball sphere mode to gizmos  
* Added detailed display to transform element  
* Added settings to change order of operations for GSR keybinds  
* Added gizmo spaces: parent, local and world  
* Added snapping to gizmo when holding `Ctrl` (and setting to change snapping)  
* Added `Shift` modifier to weaken change  
* Added inverted editor (for flipped body parts)  
* Added Gizmo to:  
  * `anchor` track editing transform  
  * Body part’s transform (`Ctrl + Q` to toggle)   
* Added keybind to hide Gizmo when held (`Alt` by default)  
* Added a mirror editing feature (`Shift + F`)  
* Added **Copy/Paste world transform** (`Ctrl + Shift + Alt + C/V`) that allows you to copy/paste exact transformation in world space (imagine you need to fixate a bone at exact position, but move anchor)  
* Fixed bug with elements not being clickable due to Gizmo sphere  
* Fixed gizmo’s sphere overlaying transparent objects in the world  
* Removed second rotate fields

## Video settings

* Added **Limit framerate** option that allows limiting speed of recording for live reaction  
* Added **Mute film audio while rendering** option to disable audio playback when recording video  
* Moved **Swap width and height** context option as a button

## Replay

* Added **Shadow follow form** film replay option that attaches vanilla shadow to model’s transform and model’s anchor (with configurable offset)  
* Fixed **Axes preview** rendering gizmo control instead of just axes

## Film editor

* Added orbit binding to replay (RMB \> Attach orbit to replay)  
* Added **Fill offset** context menu options in **Move film** overlay panel (right-click on the coordinate trackpads) to fill in the coordinates difference between current player’s position and current replay’s *first keyframe*  
* Added preview of the last clip tick when editing  
* Changed **Teleport to orbit** keybind from `Z` to `C`  
* Fixed `Ctrl + Z`/`Ctrl + Y` teleporting the orbit camera  
* Moved action editor to replay editor's tab

## Keyframes

* Added Camera editor \> Timeline grid option to enable vertical tick markers  
* Added **Auto-bezier** (`A` keybind) and **Clamped auto-bezier** (`D` keybind) interpolations  
* Added `Ctrl + F` to flip keyframes in the keyframes  
* Changed track names to lowercase (`Physics/` to `physics/`)  
* Fixed timeline ruler in the keyframe editor

## Forms

* Added **Filter tracks** in the form settings to filter out specific properties  
* Fixed scroll to currently selected form not working in the form picker  
* Removed **Animatable** option (replaced by **Filter tracks**)

## Misc

* Fixed general crash when UI changes hierarchy  
* Fixed screen freeze when using `Y` or `Right Alt` keybinds the first time entering the world due to missing film  
* Fixed error spam due to missing data on the server (server requests a sync update when missing data is encountered)  
* Fixed BOBJ loader model log spam (by checking existence of the file)

## 1.21.1 Fixes

* Fixed billboard option in billboard, extruded and label forms  
* Fixed camera in 3rd person item editor  
* Fixed vanilla particle form's block and item  
* Fixed crash with some items that incorrectly translate in BBS’ data