v1.2-rc

Hey, folks! Are you excited about shiny new Godot goodies? This pre-release is focused on Godot 4.3, and it's not compatible with 4.2.
I believe it is quite stable. But if you come upon some bugs, don't forget to report them! Thanks.

What's Changed

⭐ - highlights
⚡ - breaking changes, follow PR link for details

• GHA: Build Android platform libs in GDExtension workflow by @limbonaut in #147
• ⭐ Add support for Godot 4.3 by @Rubonnek in #64
• Register and call virtual methods on scripts in GDExtension by @limbonaut in #149
• Fix: GDExtension load fails due to Expression used without Ref<> by @limbonaut in #150
• ⭐ Generate built-in documentation header in GDExtension variant by @limbonaut in #151
• GHA improvements by @limbonaut in #154
• Replace deprecated set_auto_translate call with set_auto_translate_mode by @dpalais in #155
• ⭐ Improved layout for large displays (optional) by @limbonaut in #157
• Fix BlackboardPlan arrays shouldn't be shared between instanced agents by @limbonaut in #158
• Improve documentation tooltips by @limbonaut in #159
• Fix new task script path don't update after changing the setting by @ydeltastar in #161
• Fix error when opening scene with a BTPlayer by @ydeltastar in #162
• ⭐ HSM improvements by @limbonaut in #164
• Fix BTPlayer.restart() crash by @limbonaut in #172
• GHA: Fix iOS builds by @limbonaut in #173
• GHA: Add Linux & Windows ARM64 builds by @limbonaut in #174
• LimboHSM: Fix process_input is not enabled in active substate by @limbonaut in #176
• Hide update_mode property for non-root HSMs by @limbonaut in #177
• Fix error if changed signal is already connected in several tasks by @limbonaut in #180
• ⚡ Breaking: Implement BTInstance - runtime instance of BehaviorTree by @limbonaut in #181
• Allow monitoring BT performance in BTState by @limbonaut in #182
• ⭐ BTPlayer: Allow switching BT instance at runtime by @limbonaut in #183
• Allow supplying custom scene root for behavior tree instantiation by @limbonaut in #184
• Editor setting to prefer online docs, and open builtin docs by default by @limbonaut in #185
• ⭐ Edit task script on double-click (open help for core task) by @limbonaut in #186
• Fix C# exports print errors due to missing ClassDB binding by @limbonaut in #188
• Make player filter in the debugger case-insensitive by @ydeltastar in #189
• Improved dev setup for GDExtension by @limbonaut in #190
• Fix renaming BehaviorTree files doesn't update tab names by @ydeltastar in #191
• Fix monitor_performance screwing C# exports by @limbonaut in #193
• BlackboardPlan: Fix mapping failing for NodePath variables with prefetch enabled by @limbonaut in #195
• GHA: Preserve nuget version for C# builds by @limbonaut in #197

New Contributors

• @ydeltastar made their first contribution in #161

Full Changelog: v1.1.0...v1.2-rc

v1.1.1

Work on release for Godot 4.3 continues. In the meantime, I cherry-picked some bug fixes for this patch release, plus it comes with Android GDExtension libs.

What's Changed

• GHA: Build Android platform libs in GDExtension workflow by @limbonaut in #147
• Fix potential rare var name conflict in BTCooldown
• Fix connected signal error when loading BT for the second time
• Fix BlackboardPlan arrays shouldn't be shared between instanced agents
• Defer banner actions to not crash upon restart
• Fix new task script path don't update after changing the setting (thanks @ydeltastar)
• Fix BTPlayer.restart() crash
• Fix process_input is not enabled in active substate
• Fix error if changed signal is already connected to a BBParam in a bunch of tasks
• Fix C# exports print errors due to missing ClassDB binding

Full Changelog: v1.1.0...v1.1.1

v1.1.0

Good News, Everyone! 🎉

LimboAI version 1.1.0 is out now, bringing new quality-of-life improvements and various bug fixes. As usual, this release targets the latest stable Godot version (4.2.2 currently).
Don't miss out on the new mapping feature!

What's Changed

⭐ - highlights
⚡ - breaking changes, follow PR link for details

• Blackboard: Add create parameter to bind_var_to_property and link_var by @limbonaut in #89
• BTDecorator: Add default _tick implementation by @limbonaut in #95
• Add tests for nested HSM flow, tests for dispatch() and get_root(), and fix BBParam saved_value initializing to null by @limbonaut in #101
• Add note about how to run demo/tutorial by @TranquilMarmot in #100
• Add pre-commit configuration by @limbonaut in #103
• ⭐ ⚡ Breaking: Allow specifying agent in BTPlayer node via inspector by @limbonaut in #102
• GHA: Use older toolchain for SteamDeck compatibility by @limbonaut in #107
• ⭐ Mapping variables by @limbonaut in #106
• Editor: Check if variable is of correct type for BBParam subtypes by @limbonaut in #110
• GHA: Generate .import files for GDExtension icons by @limbonaut in #116
• GHA: Use godotengine buildroot mirror by @limbonaut in #117
• Doc: Add first steps by @limbonaut in #118
• ⭐ Implement tab navigation in the editor by @limbonaut in #120
• Fix compile-time errors with updated godot-cpp by @limbonaut in #123
• Editor: Add tab context menu option "Jump to Owner" by @limbonaut in #122
• Show version info in the editor by @limbonaut in #124
• API: Add Blackboard methods to enable iteration, state inspection & serialization by @limbonaut in #125
• Add unit tests for Blackboard and fix Blackboard.unbind_var() by @limbonaut in #127
• Fix custom task issues - a rare crash & a sticky name/script issue, and improve error handling by @limbonaut in #130
• Fix reparenting an agent deactivates its HSM by @limbonaut in #131
• Fix crash when freeing agent with performance monitoring enabled by @limbonaut in #133
• Fix folding/unfolding selected composite task is not working by @limbonaut in #136
• Fix task tree warnings column always taking up space by @limbonaut in #142
• Support light themes for editor icons in GDExtension by @limbonaut in #145

New Contributors

• @TranquilMarmot made their first contribution in #100

Full Changelog: v1.0.2...v1.1.0

v1.1-rc

What's Changed

⚡ - compatibility breaking, follow PR link for details.

• Blackboard: Add create parameter to bind_var_to_property and link_var by @limbonaut in #89
• BTDecorator: Add default _tick implementation by @limbonaut in #95
• Add tests for nested HSM flow, tests for dispatch() and get_root(), and fix BBParam saved_value initializing to null by @limbonaut in #101
• Add note about how to run demo/tutorial by @TranquilMarmot in #100
• Add pre-commit configuration by @limbonaut in #103
• ⚡ Breaking: Allow specifying agent in BTPlayer node via inspector by @limbonaut in #102
• GHA: Use older toolchain for SteamDeck compatibility by @limbonaut in #107
• Mapping variables by @limbonaut in #106
• Editor: Check if variable is of correct type for BBParam subtypes by @limbonaut in #110
• GHA: Generate .import files for GDExtension icons by @limbonaut in #116
• GHA: Use godotengine buildroot mirror by @limbonaut in #117
• Doc: Add first steps by @limbonaut in #118
• Implement tab navigation in the editor by @limbonaut in #120
• Fix compile-time errors with updated godot-cpp by @limbonaut in #123
• Editor: Add tab context menu option "Jump to Owner" by @limbonaut in #122
• Show version info in the editor by @limbonaut in #124
• API: Add Blackboard methods to enable iteration, state inspection & serialization by @limbonaut in #125
• Add unit tests for Blackboard and fix Blackboard.unbind_var() by @limbonaut in #127
• Fix custom task issues - a rare crash & a sticky name/script issue, and improve error handling by @limbonaut in #130
• Fix reparenting an agent deactivates its HSM by @limbonaut in #131

New Contributors

• @TranquilMarmot made their first contribution in #100

Full Changelog: v1.0.2...v1.1-rc

v1.0.2

What's Changed

• GHA: Provide version.txt with GDExtension builds & demo project by @limbonaut in #87
• GHA: Build .NET binaries for macOS by @limbonaut in #88
• HSM: Delay state transition till update is finished by @limbonaut in #91
• Support multiple debugger sessions by @limbonaut in #92
• Fix LimboState::get_root and dispatch freeze the process in case of nested HSMs by @limbonaut in #93
• Documentation update - BTSubTree by @onze in #96

New Contributors

• @onze made their first contribution in #96

Full Changelog: v1.0.1...v1.0.2

Update (May 27)

Builds were updated using a different toolchain to support Steam Deck and older Linux distributions. All the packages were updated to the new build.

v1.0.1

What's Changed

• Fix blackboard plan issues by @limbonaut in #82
• BTSubtree: Fix subtree blackboard plan is not property utilized by @limbonaut in #84
• BlackboardPlan fixes by @limbonaut in #85

Full Changelog: v1.0...v1.0.1

v1.0

Good News, Everyone! 🎉

LimboAI version 1.0 is finally here after months of intensive coding and refining! 🧠🔧
Now with GDExtension support, a new powerful blackboard system, improved editor, awesome demo project, and much more! 🥳

What's Changed

• GDExtension support!
  • See Using GDExtension.
  • GDExtension builds are also available in GitHub Actions.
• Revised Blackboard system
  • Breaking compatibility: BTPlayer's blackboard_data is replaced with new BlackboardPlan system (see below).
    • If you have blackboard data defined in BTPlayer or LimboState nodes, you need to redefine it using the new system.
  • New workflow: Define variables in the BehaviorTree resource and override those variables in the BTPlayer node.
    • Variables that begin with "_" are considered private and can't be overridden (they are hidden).
    • See Sharing data using Blackboard.
  • BlackboardPlan resource: Stores and manages a collection of variables, and is used to construct new Blackboard instances.
    • Define blackboard variables in a BehaviorTree resource, using its BlackboardPlan property.
    • BTPlayer also has its own BlackboardPlan which extends the behavior tree BlackboardPlan resource, i.e. variables from the BehaviorTree resource are overridden in the BTPlayer node.
  • BlackboardPlan editor
    • Accessed with "Manage..." button in the inspector.
    • Rename, reposition, and change types and hints of the blackboard variables.
    • Specify relevant export hints for the variables.
    • Edit default variable values directly in the inspector.
    • NodePath prefetching is now enabled/disabled in the BlackboardPlan editor.
  • Binding: Bind variables to object properties using blackboard.bind_var() method.
    • A variable bound to a property will have the same value as that property (for both reading and writing).
  • Linking: Link variables using blackboard.link_var() method at runtime.
    • Two linked variables in different blackboards will share the same state.
  • Inspector property editor for BB variables:
    • Handy property editor that shows an indicator if a variable is included in the blackboard.
      • Clicking on the indicator takes you straight to the blackboard plan editor and autofills the variable name if it doesn't exist.
      • Special indicator for variables that begin with "_" (aka private variables).
    • Also provides a drop-down selection of existing variables.
    • Can be used with custom tasks.
    • Important: It appears for any StringName property in a custom task that ends with "_var" and also for exported BBParam properties.
• Editor improvements
  • Change Type action: Switch task's type with the "Change Type" context menu action.
  • Extract Subtree action: Save subtrees with the "Extract Subtree" context menu action (using BTSubtree decorator).
  • Adding tasks with Shift-click: In Task Palette, Shift+click to add a task after the selected and on the same level as the selected task.
  • Cut-Copy-Paste: New Cut, Copy and Paste actions in the behavior tree editor.
  • BBParam editor: Handy custom property editor for blackboard parameters, and new BBParam types.
  • Remember collapsed branches in behavior trees.
• Tasks
  • New BTEvaluateExpression task : Evaluate an Expression against a node or object (thanks @Rubonnek).
  • BTCallMethod improvements:
    • Include its delta as an argument. Thanks, @Rubonnek!
    • Store result on the blackboard.
    • Allow using blackboard variables as arguments for the call.
  • BTRunLimit improvements: New count_policy property.
    • Breaking compatibility: RunLimit count policy defaults to counting only successful runs. Previously, both successful and failed runs were counted.
• State machines
  • Refactored LimboHSM, LimboState, and BTState code.
  • Disallow LimboHSM transitions to self when ANYSTATE is used.
  • Allow LimboState::dispatch to be called from inside the hierarchy.
  • Provide the previous state in the state_changed signal.
  • Fix crashing on HSM update with state transition.
  • Fix BTState not honoring API virtual methods.
• Comprehensive Demo: New extensive demo project with a tutorial, several examples and a small game.
  • Tutorial: Introduction to behavior trees with examples inside the demo project!
• Debugger improvements:
  • Performance gains: Implement selective tree updates in BehaviorTreeView.
  • New option: Specify update interval.
  • Visualize BTs in-game: Expose BehaviorTreeView and BehaviorTreeData to use with custom in-game tools.
• Online documentation: link.
• Other changes
  • Use StringName for blackboard variables and HSM events.
  • Remove "p_" from the argument names in the ClassDB bindings.
  • New function to decorate output variables in LimboUtility (for custom tasks).
  • Expose checks and operations in LimboUtility (for custom tasks).
  • Better error handling when resolving _generate_name.
  • Complain in Blackboard::get_var if variable is missing.
  • Fix: BTProbability showing incorrect percentage.
  • Fix crash upon increasing TypedArray<BBVariant> size (thanks @Rubonnek).
  • Fix building as external module (thanks @dpalais).
  • Fix BehaviorTreeView::update_tree null data crash (thanks @Rubonnek).
  • Fix: Assigning variables via code might have no effect if done before initialization.
  • Fix error when clicking resource header in debugger with a scene-embedded BT.
  • Fix user-passed parent scope is ignored in state initialization (thanks @dpalais).
  • Documentation updates.
  • And more!

New Contributors

• @Rubonnek made their first contribution in #9
• @VisitingOcean made their first contribution in #21
• @dpalais made their first contribution in #56

Full Changelog: v0.5...v1.0

v1.0-rc3

LimboAI 1.0 RC3 is out now 🚀 bringing us a step closer to the stable release with a number of small fixes and improvements.

Changes in v1.0-rc3

• Improvements
  • Prefetching rework: Move prefetching into BlackboardPlan and add checkbox to the plan editor.
  • Linking vars with Blackboard::link_var.
  • Blackboard-related improvements and fixes.
  • BBParam editor: Combine type+mode functionality in one button.
  • Demo: Display custom task source code upon selection in BehaviorTreeView.
• Fixes
  • Fix crashing on HSM update with state transition.
  • Fix "Manage" button is sometimes shown for derived plans.
  • Fix BTState not honoring API virtual methods.
  • Fix building as external module (thanks @dpalais).
  • Fix BehaviorTreeView::update_tree null data crash (thanks @Rubonnek).
  • Set parent scope in state initialization (thanks @dpalais).
  • Demo-related fixes.
• API changes
  • Expose BlackboardPlan factory methods.
  • New task_selected signal for BehaviorTreeView.
  • Use StringName for blackboard variables and HSM events.
  • Remove "p_" from the argument names in the ClassDB bindings.
  • Provide the previous state in the state_changed signal.
  • Allow LimboState::dispatch to be called from inside the hierarchy.
  • Expose BehaviorTreeView::clear to GDScript (thanks @Rubonnek).
  • Expose additional BlackboardPlan methods for custom tooling.
• Documentation updates.

Previous changes in v1.0 (click to expand)

Changes in v1.0-rc2

• Debugger improvements:
  • Performance gains: Implement selective tree updates in BehaviorTreeView.
  • New option: Specify update interval.
• New BTEvaluateExpression task : Evaluate an Expression against a node or object (thanks @Rubonnek).
• Demo: Various fixes.
• Documentation updates.
• GHA: Add debug build for web target, and add the missing entries in GDExtension manifest.
• Fix crash upon increasing TypedArray<BBVariant> size (thanks @Rubonnek).
• Fix icons not showing for user tasks in the demo project.

Full Changelog: v1.0-rc1...v1.0-rc2

Changes in v1.0-rc1

• Comprehensive Demo: New extensive demo project includes a tutorial, several examples and a small game.
• Tutorial: Introduction to behavior trees with examples inside the demo project.
• Cut-Copy-Paste: New Cut, Copy and Paste actions in the behavior tree editor.
• BTRunLimit improvements: New count_policy property.
  • Breaking compatibility: RunLimit count policy defaults to counting only successful runs. Previously, both successful and failed runs were counted.
• Visualize BTs In-Game: Exposed BehaviorTreeView and BehaviorTreeData to use with custom in-game tools.
  • BehaviorTreeView received improvements.
• Other changes
  • Updated documentation with fixes from @VisitingOcean and @Rubonnek.
  • Fix: BTProbability showing incorrect percentage
  • Editor: Remember collapsed items in task tree
  • Fix: Debugger crashes when detached in GDExtension
  • Fix: Shortcuts not working in the module version
  • Disallow LimboHSM transitions to self when ANYSTATE is used
  • Improved variable synchronization between base and derived blackboard plans
  • Util: New function to decorate output variables (can be used by scripts)
  • Better error handling when resolving _generate_name
  • Blackboard: get_var now complains when variable is missing
  • GHA: Added Web target to GDExtension workflow

Changes in v1.0-dev3

• Revised Blackboard system:
  • Breaking compatibility: BTPlayer's blackboard_data is replaced with new BlackboardPlan system (see below).
    • If you have blackboard data defined in BTPlayer or LimboState nodes, you'd need to redefine it using the new system.
  • New workflow: Define variables in the BehaviorTree resource and override those variables in the BTPlayer node.
    • Variables that begin with "_" are considered private and can't be overridden (they are hidden).
    • See also: Sharing data using Blackboard.
  • BlackboardPlan resource: Stores and manages a collection of variables, and is used to construct new Blackboard instances.
    • Define blackboard variables in a BehaviorTree resource, using its BlackboardPlan property.
    • BTPlayer also has its own BlackboardPlan which extends the behavior tree BlackboardPlan resource, i.e. variables from the BehaviorTree resource are overridden in the BTPlayer node.
  • BlackboardPlan Editor
    • Accessed with "Manage..." button in the inspector.
    • Rename, reposition, and change types and hints of the blackboard variables.
    • Specify relevant export hints for the variables.
    • Edit default variable values directly in the inspector.
  • Binding: Bind variables to object properties using blackboard.bind_var() method.
  • Blackboard variable property editor:
    • Used in the blackboard tasks and can be used with custom tasks.
      • Note: It is shown for any property that ends with "_var" and also when using BBParam-derived parameters.
    • Handy property editor that shows an indicator if variable is included in the blackboard.
    • Clicking on the indicator takes you straight to the blackboard plan editor and auto-fills variable name if it doesn't exist.
    • Also provides a drop-down selection of existing variables.
    • Special indicator for variables that begin with "_" (aka private variables).
  • These changes are fully compatible with both module and GDExtension builds!
• Other changes
  • BBVariable object holds the value of a blackboard variable and its metadata (not exposed to the API).
  • GHA: Fixed issues with iOS templates build workflow
  • Refactored LimboHSM and LimboState code.
  • Fixed focus issues with BBParam property editor

Changes in v1.0-dev2

• New and improved workaround for the missing GDVIRTUAL* macros.
  • Fixes native method override errors.
  • @warning_ignore for custom task methods is no longer needed!
• Add new BBParam types.
• Refactored LimboHSM and LimboState code.
• Fix: icon entries unsorted in GDExtension manifest.
• Editor: Show info dialog about editing project settings in GDExtension.
• Editor: Links to "Creating custom tasks" doc page in the editor and banner improvements.

Changes in v1.0-dev1

• GDExtension support! Check out Using GDExtension
  • GDExtension builds are available in GitHub Actions.
• BBParam editor: Handy custom property editor for blackboard parameters.
  • Support for editing variant-type blackboard parameters (BBVariant).
• BTCallMethod improvements:
  • Include its delta as an argument. Thanks, @Rubonnek!
  • Store result on the blackboard.
  • Allow using blackboard variables as arguments for the call.
• Online documentation: Check out online docs here.
• Change Type action: Switch task's type with the "Change Type" context menu action.
• Extract Subtree action: Save subtrees with the "Extract Subtree" context menu action (using BTSubtree decorator).
• Adding tasks with Shift-click: In Task Palette, Shift+click to add a task after the selected and on the same level as the selected task.

Other improvements

• Fix LimboDebugger crash when EngineDebugger is not active. Thanks, @Rubonnek!
• In the Debugger, show resource info for the currently presented BehaviorTree.
• Fix debugger's "elapsed" column not always has enough space for decimals.
• Open BehaviorTree in the BT editor when its property is clicked in the inspector.
• Fix button focus in the Task Palette.
• Optimize prefetching node references in the Blackboard and BTPlayer.
• Various fixes in the class documentation.
• Fix BTCheckVar performs erroneous equality check.
• Improvements in the build workflows.

New Contributors

• @dpalais made their first contribution in #56

Full Changelog: v1.0-rc2...v1.0-rc3

v1.0-rc2

Changes in v1.0-rc2

• Debugger improvements:
  • Performance gains: Implement selective tree updates in BehaviorTreeView.
  • New option: Specify update interval.
• New BTEvaluateExpression task : Evaluate an Expression against a node or object (thanks @Rubonnek).
• Demo: Various fixes.
• Documentation updates.
• GHA: Add debug build for web target, and add the missing entries in GDExtension manifest.
• Fix crash upon increasing TypedArray<BBVariant> size (thanks @Rubonnek).
• Fix icons not showing for user tasks in the demo project.

Full Changelog: v1.0-rc1...v1.0-rc2

Previous changes in v1.0 (click to expand)

Changes in v1.0-rc1

• Comprehensive Demo: New extensive demo project includes a tutorial, several examples and a small game.
• Tutorial: Introduction to behavior trees with examples inside the demo project.
• Cut-Copy-Paste: New Cut, Copy and Paste actions in the behavior tree editor.
• BTRunLimit improvements: New count_policy property.
  • Breaking compatibility: RunLimit count policy defaults to counting only successful runs. Previously, both successful and failed runs were counted.
• Visualize BTs In-Game: Exposed BehaviorTreeView and BehaviorTreeData to use with custom in-game tools.
  • BehaviorTreeView received improvements.
• Other changes
  • Updated documentation with fixes from @VisitingOcean and @Rubonnek.
  • Fix: BTProbability showing incorrect percentage
  • Editor: Remember collapsed items in task tree
  • Fix: Debugger crashes when detached in GDExtension
  • Fix: Shortcuts not working in the module version
  • Disallow LimboHSM transitions to self when ANYSTATE is used
  • Improved variable synchronization between base and derived blackboard plans
  • Util: New function to decorate output variables (can be used by scripts)
  • Better error handling when resolving _generate_name
  • Blackboard: get_var now complains when variable is missing
  • GHA: Added Web target to GDExtension workflow

Changes in v1.0-dev3

• Revised Blackboard system:
  • Breaking compatibility: BTPlayer's blackboard_data is replaced with new BlackboardPlan system (see below).
    • If you have blackboard data defined in BTPlayer or LimboState nodes, you'd need to redefine it using the new system.
  • New workflow: Define variables in the BehaviorTree resource and override those variables in the BTPlayer node.
    • Variables that begin with "_" are considered private and can't be overridden (they are hidden).
    • See also: Sharing data using Blackboard.
  • BlackboardPlan resource: Stores and manages a collection of variables, and is used to construct new Blackboard instances.
    • Define blackboard variables in a BehaviorTree resource, using its BlackboardPlan property.
    • BTPlayer also has its own BlackboardPlan which extends the behavior tree BlackboardPlan resource, i.e. variables from the BehaviorTree resource are overridden in the BTPlayer node.
  • BlackboardPlan Editor
    • Accessed with "Manage..." button in the inspector.
    • Rename, reposition, and change types and hints of the blackboard variables.
    • Specify relevant export hints for the variables.
    • Edit default variable values directly in the inspector.
  • Binding: Bind variables to object properties using blackboard.bind_var() method.
  • Blackboard variable property editor:
    • Used in the blackboard tasks and can be used with custom tasks.
      • Note: It is shown for any property that ends with "_var" and also when using BBParam-derived parameters.
    • Handy property editor that shows an indicator if variable is included in the blackboard.
    • Clicking on the indicator takes you straight to the blackboard plan editor and auto-fills variable name if it doesn't exist.
    • Also provides a drop-down selection of existing variables.
    • Special indicator for variables that begin with "_" (aka private variables).
  • These changes are fully compatible with both module and GDExtension builds!
• Other changes
  • BBVariable object holds the value of a blackboard variable and its metadata (not exposed to the API).
  • GHA: Fixed issues with iOS templates build workflow
  • Refactored LimboHSM and LimboState code.
  • Fixed focus issues with BBParam property editor

Changes in v1.0-dev2

• New and improved workaround for the missing GDVIRTUAL* macros.
  • Fixes native method override errors.
  • @warning_ignore for custom task methods is no longer needed!
• Add new BBParam types.
• Refactored LimboHSM and LimboState code.
• Fix: icon entries unsorted in GDExtension manifest.
• Editor: Show info dialog about editing project settings in GDExtension.
• Editor: Links to "Creating custom tasks" doc page in the editor and banner improvements.

Changes in v1.0-dev1

• GDExtension support! Check out Using GDExtension
  • GDExtension builds are available in GitHub Actions.
• BBParam editor: Handy custom property editor for blackboard parameters.
  • Support for editing variant-type blackboard parameters (BBVariant).
• BTCallMethod improvements:
  • Include its delta as an argument. Thanks, @Rubonnek!
  • Store result on the blackboard.
  • Allow using blackboard variables as arguments for the call.
• Online documentation: Check out online docs here.
• Change Type action: Switch task's type with the "Change Type" context menu action.
• Extract Subtree action: Save subtrees with the "Extract Subtree" context menu action (using BTSubtree decorator).
• Adding tasks with Shift-click: In Task Palette, Shift+click to add a task after the selected and on the same level as the selected task.

Other improvements

• Fix LimboDebugger crash when EngineDebugger is not active. Thanks, @Rubonnek!
• In the Debugger, show resource info for the currently presented BehaviorTree.
• Fix debugger's "elapsed" column not always has enough space for decimals.
• Open BehaviorTree in the BT editor when its property is clicked in the inspector.
• Fix button focus in the Task Palette.
• Optimize prefetching node references in the Blackboard and BTPlayer.
• Various fixes in the class documentation.
• Fix BTCheckVar performs erroneous equality check.
• Improvements in the build workflows.

v1.0-rc1

Changes in v1.0-rc1

• Comprehensive Demo: New extensive demo project includes a tutorial, several examples and a small game.
• Tutorial: Introduction to behavior trees with examples inside the demo project.
• Cut-Copy-Paste: New Cut, Copy and Paste actions in the behavior tree editor.
• BTRunLimit improvements: New count_policy property.
  • Breaking compatibility: RunLimit count policy defaults to counting only successful runs. Previously, both successful and failed runs were counted.
• Visualize BTs In-Game: Exposed BehaviorTreeView and BehaviorTreeData to use with custom in-game tools.
  • BehaviorTreeView received improvements.
• Other changes
  • Updated documentation with fixes from @VisitingOcean and @Rubonnek.
  • Fix: BTProbability showing incorrect percentage
  • Editor: Remember collapsed items in task tree
  • Fix: Debugger crashes when detached in GDExtension
  • Fix: Shortcuts not working in the module version
  • Disallow LimboHSM transitions to self when ANYSTATE is used
  • Improved variable synchronization between base and derived blackboard plans
  • Util: New function to decorate output variables (can be used by scripts)
  • Better error handling when resolving _generate_name
  • Blackboard: get_var now complains when variable is missing
  • GHA: Added Web target to GDExtension workflow

Previous changes in v1.0 (click to expand)

Changes in v1.0-dev3

• Revised Blackboard system:
  • Breaking compatibility: BTPlayer's blackboard_data is replaced with new BlackboardPlan system (see below).
    • If you have blackboard data defined in BTPlayer or LimboState nodes, you'd need to redefine it using the new system.
  • New workflow: Define variables in the BehaviorTree resource and override those variables in the BTPlayer node.
    • Variables that begin with "_" are considered private and can't be overridden (they are hidden).
    • See also: Sharing data using Blackboard.
  • BlackboardPlan resource: Stores and manages a collection of variables, and is used to construct new Blackboard instances.
    • Define blackboard variables in a BehaviorTree resource, using its BlackboardPlan property.
    • BTPlayer also has its own BlackboardPlan which extends the behavior tree BlackboardPlan resource, i.e. variables from the BehaviorTree resource are overridden in the BTPlayer node.
  • BlackboardPlan Editor
    • Accessed with "Manage..." button in the inspector.
    • Rename, reposition, and change types and hints of the blackboard variables.
    • Specify relevant export hints for the variables.
    • Edit default variable values directly in the inspector.
  • Binding: Bind variables to object properties using blackboard.bind_var() method.
  • Blackboard variable property editor:
    • Used in the blackboard tasks and can be used with custom tasks.
      • Note: It is shown for any property that ends with "_var" and also when using BBParam-derived parameters.
    • Handy property editor that shows an indicator if a variable is included in the blackboard.
    • Clicking on the indicator takes you straight to the blackboard plan editor and autofills the variable name if it doesn't exist.
    • Also provides a drop-down selection of existing variables.
    • Special indicator for variables that begin with "_" (aka private variables).
  • These changes are fully compatible with both module and GDExtension builds!
• Other changes
  • BBVariable object holds the value of a blackboard variable and its metadata (not exposed to the API).
  • GHA: Fixed issues with iOS templates build workflow
  • Refactored LimboHSM and LimboState code.
  • Fixed focus issues with BBParam property editor

Changes in v1.0-dev2

• New and improved workaround for the missing GDVIRTUAL* macros.
  • Fixes native method override errors.
  • @warning_ignore for custom task methods is no longer needed!
• Add new BBParam types.
• Refactored LimboHSM and LimboState code.
• Fix: icon entries unsorted in GDExtension manifest.
• Editor: Show info dialog about editing project settings in GDExtension.
• Editor: Links to "Creating custom tasks" doc page in the editor and banner improvements.

Changes in v1.0-dev1

• GDExtension support! Check out Using GDExtension
  • GDExtension builds are available in GitHub Actions.
• BBParam editor: Handy custom property editor for blackboard parameters.
  • Support for editing variant-type blackboard parameters (BBVariant).
• BTCallMethod improvements:
  • Include its delta as an argument. Thanks, @Rubonnek!
  • Store result on the blackboard.
  • Allow using blackboard variables as arguments for the call.
• Online documentation: Check out online docs here.
• Change Type action: Switch task's type with the "Change Type" context menu action.
• Extract Subtree action: Save subtrees with the "Extract Subtree" context menu action (using BTSubtree decorator).
• Adding tasks with Shift-click: In Task Palette, Shift+click to add a task after the selected and on the same level as the selected task.

Other improvements

• Fix LimboDebugger crash when EngineDebugger is not active. Thanks, @Rubonnek!
• In the Debugger, show resource info for the currently presented BehaviorTree.
• Fix debugger's "elapsed" column not always has enough space for decimals.
• Open BehaviorTree in the BT editor when its property is clicked in the inspector.
• Fix button focus in the Task Palette.
• Optimize prefetching node references in the Blackboard and BTPlayer.
• Various fixes in the class documentation.
• Fix BTCheckVar performs erroneous equality check.
• Improvements in the build workflows.