Base class for [AnimationTree] nodes. Not related to scene nodes. Base resource for [AnimationTree] nodes. In general, it's not used directly, but you can create custom ones with custom blending formulas. Inherit this when creating animation nodes mainly for use in [AnimationNodeBlendTree], otherwise [AnimationRootNode] should be used instead. $DOCS_URL/tutorials/animation/animation_tree.html When inheriting from [AnimationRootNode], implement this virtual method to override the text caption for this animation node. When inheriting from [AnimationRootNode], implement this virtual method to return a child animation node by its [param name]. When inheriting from [AnimationRootNode], implement this virtual method to return all child animation nodes in order as a [code]name: node[/code] dictionary. When inheriting from [AnimationRootNode], implement this virtual method to return the default value of a [param parameter]. Parameters are custom local memory used for your animation nodes, given a resource can be reused in multiple trees. When inheriting from [AnimationRootNode], implement this virtual method to return a list of the properties on this animation node. Parameters are custom local memory used for your animation nodes, given a resource can be reused in multiple trees. Format is similar to [method Object.get_property_list]. When inheriting from [AnimationRootNode], implement this virtual method to return whether the blend tree editor should display filter editing on this animation node. When inheriting from [AnimationRootNode], implement this virtual method to return whether the [param parameter] is read-only. Parameters are custom local memory used for your animation nodes, given a resource can be reused in multiple trees. When inheriting from [AnimationRootNode], implement this virtual method to run some code when this animation node is processed. The [param time] parameter is a relative delta, unless [param seek] is [code]true[/code], in which case it is absolute. Here, call the [method blend_input], [method blend_node] or [method blend_animation] functions. You can also use [method get_parameter] and [method set_parameter] to modify local memory. This function should return the time left for the current animation to finish (if unsure, pass the value from the main blend being called). Adds an input to the animation node. This is only useful for animation nodes created for use in an [AnimationNodeBlendTree]. If the addition fails, returns [code]false[/code]. Blend an animation by [param blend] amount (name must be valid in the linked [AnimationPlayer]). A [param time] and [param delta] may be passed, as well as whether [param seeked] happened. A [param looped_flag] is used by internal processing immediately after the loop. See also [enum Animation.LoopedFlag]. Blend an input. This is only useful for animation nodes created for an [AnimationNodeBlendTree]. The [param time] parameter is a relative delta, unless [param seek] is [code]true[/code], in which case it is absolute. A filter mode may be optionally passed (see [enum FilterAction] for options). Blend another animation node (in case this animation node contains child animation nodes). This function is only useful if you inherit from [AnimationRootNode] instead, otherwise editors will not display your animation node for addition. Returns the input index which corresponds to [param name]. If not found, returns [code]-1[/code]. Amount of inputs in this animation node, only useful for animation nodes that go into [AnimationNodeBlendTree]. Gets the name of an input by index. Gets the value of a parameter. Parameters are custom local memory used for your animation nodes, given a resource can be reused in multiple trees. Returns whether the given path is filtered. Removes an input, call this only when inactive. Adds or removes a path for the filter. Sets the name of the input at the given [param input] index. If the setting fails, returns [code]false[/code]. Sets a custom parameter. These are used as local memory, because resources can be reused across the tree or scenes. If [code]true[/code], filtering is enabled. Emitted by nodes that inherit from this class and that have an internal tree when one of their animation nodes removes. The animation nodes that emit this signal are [AnimationNodeBlendSpace1D], [AnimationNodeBlendSpace2D], [AnimationNodeStateMachine], and [AnimationNodeBlendTree]. Emitted by nodes that inherit from this class and that have an internal tree when one of their animation node names changes. The animation nodes that emit this signal are [AnimationNodeBlendSpace1D], [AnimationNodeBlendSpace2D], [AnimationNodeStateMachine], and [AnimationNodeBlendTree]. Emitted by nodes that inherit from this class and that have an internal tree when one of their animation nodes changes. The animation nodes that emit this signal are [AnimationNodeBlendSpace1D], [AnimationNodeBlendSpace2D], [AnimationNodeStateMachine], [AnimationNodeBlendTree] and [AnimationNodeTransition]. Do not use filtering. Paths matching the filter will be allowed to pass. Paths matching the filter will be discarded. Paths matching the filter will be blended (by the blend value).