Blends two animations additively inside of an [AnimationNodeBlendTree].
A resource to add to an [AnimationNodeBlendTree]. Blends two animations additively based on the amount value. If the amount is greater than [code]1.0[/code], the animation connected to "in" port is blended with the amplified animation connected to "add" port. If the amount is less than [code]0.0[/code], the animation connected to "in" port is blended with the inverted animation connected to "add" port.
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