Welcome to Blockbench 4.1 - The Inverse Kinematics Update!

Changes

Inverse Kinematics are back! They allow you to animate a chain of bones by moving the end point. Here's how to use them:

Set up a bone chain, this can be a leg, tail, etc. Make sure all pivots are correct
Add a Null Object (from the edit menu) to the parent bone of the chain, e. g. the bone you do not want to move
Right click the Null Object and select the IK target. This can be the bone at the end of the chain, or a locator at the end of the chain.
Switch to animation mode, create an animation, and animate the position of the Null Object. This will animate the bone chain to always try to reach the target.
Export as glTF or bedrock animation. Make sure to also save the project as a .bbmodel file in order to keep the original movement of the null object.
Note that the option "Lock IK Target Rotation" is not implemented at the moment

Added IK
Added new keyframe interpolation type "Step"
Add support for new Molang queries: camera_rotation, rotation_to_camera, distance_from_camera, lod_index, and camera_distance_range_lerp.
Added option to bake current animation pose into model
Added button to load remaining animations from animation file
Allow import of multiple animation files at once
Added support for keyframe files (sounds, particles) in web app / PWA
The timeline head is now resizable
Animations can now be copied and pasted

Added new mesh shape preset: Plane
Further improved mesh template generator
Improved mesh extrusion
Added options to control parameters for some mesh actions, such as Extrude, Loop Cut
Generating meshes and adding new faces now auto-UVs face

Changed Filter menu to Tools
Improve copy paste tool UX (#628)
Added GIF recording HUD and cropping (#1181)
Added new marker colors: Pink and Silver
Added modifier key suggestions, displayed in the status bar
Added UV overlay in Paint mode
Added option to show a ground plane
Improved Minecraft Bedrock texture import dialog
Added New Window option to the File menu
Added a setting to set a default for and skip the ambiguous paste menu
Added keybinding label to "Search and Run Action" option in help menu
Clicking on buttons with a menu that is open now closes the menu again
Improved the GIF recorder dialog, it now remembers the values and hides irrelevant inputs
Restructured texture generator dialog and made Texture Template the default option
Added search bar on start screen
Added option to automatically hide the tab bar if only one tab is open
Improved the design of About panels in the plugin menu
Increased recent model cap from 12 to 32 and maximum allowed cap from 128 to 256
Reorganized UV editor toolbar, added mirror UV actions

Added rotation mode in camera angle dialogs, allows you to specify the camera angle either as a rotation in degrees, or as a start point and a target point like before
Action Control can now select camera angles
Separated different types of camera angles in the angles submenu

Added Collada (.dae) export
Shift + click can now be used to select the parent bone of the selected bone
Add gizmos to resize elements on two axes at once
Added menu to Action Control to select the type
Added Pose mode, replaces Edit mode in the skin format
Added Pose panel, allows you to select a pose from a number of presets
Added preset menu for Minecraft Bedrock attachable bindings
Added support for screen color picker in the latest Chromium-based browsers (Chrome 95+, Edge 95+)
When an upload to Sketchfab fails, the error code is now visible in the error dialog

Updated Electron to version 16
Updated Workbox version
Added keyframe channel API to allow custom animator types and custom keyframe channels
Added "confidential" field to formats to hide in streamer mode