September 23, 2025

Note - releases no longer include binaries in the release notes.
Download the latest version here: https://docs.flatredball.com/flatredball

Breaking Changes

No breaking changes 🥳

Biggest Changes

FRB Editor's embedded .achx editor has gotten a huge boost! Lots of properties that were read-only for previewing are now fully editable including:

• Creating new Animations
• Creating new frames
• Modifying the coordinates of existing frames
• Snapping
• Drag+move of frames
• Editing frame time, individual and in bulk
• Improved display of frame information in tree view

FRB Editor

• Fixed IGumScreenOwner not being assigned (thanks @mfigueirido )
• Faster wildcard scanning speed on project startup (thanks @mfigueirido )
• Fixed Gum codegen bug on project switching
• Added support for Gum container blend
• Removed code that was overwriting the variable texture offsets when rendering maps, used to eliminate seams and adjacent pixel bleeding
• Fixed possible crash with duplicate csproj items
• Removed unnecessary .csproj saving when updating .xnb links - speeding up startup and content pipeline builds
• Fixed incorrect ToLower calls on xnb reference adding to csproj, reducing csproj churn
• Improved treeview behavior when clicking, moving the mouse slightly, then ending up on the same node
• Platformers can now use AxisAlignedRectangle subcollision
• Fixed Sprites with tunneled Current Chain Name not allowing setting this value from animations chains defined in the original entity
• Fixed "Finishined" typo in project compilation (thanks @AristurtleDev )
• Variants are now code generated in "file" alphabetical order
• File builds are no longer performed in parallel since that can cause soffice.exe to fail
• Added more informative exception when generating Gum projects that are missing default state
• Editor now properly generates code for Gum XUnits and YUnits, avoiding obsolete types
• Added support for editing Spine .atlas files in the new AnimationEditor

Edit Mode

• Sprites that are attached to parents but use relative positions from animations can no longer be moved. This removes confusing behavior where a Sprite is moved but then it snaps back to its original position when the app runs.
• Fixed copy+paste not correctly assigning Z value

FRB Engine and Code-related

• Added AudioManager.IsSoundEffectInstancePlaying
• Xbox360Gamepad AnalogOnThreshold is now a property which can be set (thanks @mfigueirido )
• ToastManager no longer tries to create toast if no visuals exist, fixing crashes when copying objects in edit mode
• Updated to support ListBox IsEnabled=false from GumForms by adding IsEnabledRecursively
• FRB MonoGame .NET 6 engines are now nullable enabled
• Added offset parameters to TileNodeNetwork CreateFrom(LayeredTileMap...) (thanks @mfigueirido )
• Added new unit test project
• Improved Polygon vs Polygon and Polygon vs AARect collision by using SAT. This handles lots of edge cases that would fail previously, and likely is faster too (thanks @bransay )
• Improvement in collision across lots of methods by making Segment.DistanceTo no longer create segments (thanks @mfigueirido )
• Improved velocity assignment when bouncing with acceleration and drag
• FlatRedBall no uses private assets, so MonoGame can be independently updated per game

New Project Templates

• Added new .NET 9+ project template

Full Changelog: Release_June_11_2025...Release_September_23_2025