by cosmosmythos·Motion Graphics
Images © cosmosmythos. Used for product review; image policy.
GP Tween (c) earns its place in the Blender extensions library for handling Grease Pencil inbetweening through Geometry Nodes, with baking tools to finalize the result.
GP Tween (c) is a Grease Pencil tweening add-on for Blender by cosmosmythos. It leverages Geometry Nodes to generate interpolated frames between your Grease Pencil keyframes, operating on a per-layer basis. Because it builds on the flexibility of Geometry Nodes, strokes can be interpolated to or from any spline type. To keep the timeline uncluttered, it creates a separate stroke for the inbetweening process based on the selected layer.
When the in-betweens are ready, a built-in baking command commits them as keyframes. The add-on is aimed at Grease Pencil animators looking for a quick, organized and non-destructive inbetweening workflow.
Version 2.4.0 adds Vector Drawing Assist Tools that appear in the top header while in Grease Pencil Edit mode. These include accurate resampling that targets exact point counts and outputs as a Bezier, Poly, Catmull-Rom or Nurbs stroke type, improved stroke point visibility in edit mode including unselected strokes for the current keyframe, and one-click vector and auto align buttons for Bezier handle types. It is compatible with Blender 4.3 and newer and licensed under the GNU General Public License v3.0 or later.
GP Tween (c) is best for grease Pencil animators looking for a quick, organized and non-destructive inbetweening workflow.
GP Tween (c) is completely free to download and use.
GP Tween (c) is compatible with Blender 4.3 and newer, so you need at least that release to run it. If you are on an earlier version, update Blender before installing. You can add it by dragging and dropping the extension into Blender, or by downloading the add-on and installing it from disk. The current version listed is 2.4.0, and earlier releases are also available. For version history and other details, check the developer's page.
GP Tween (c) does not require external add-ons. In a review reply, the developer confirmed that no external add-ons are needed for the deformation and Bezier handling the tool provides. The interpolation itself is built on Geometry Nodes, so the core functionality is contained within the add-on once it is installed in Blender 4.3 or newer. The developer also mentioned a separate paid add-on, Grease Pencil Auto-Interpolate, built for improved performance, but it is not required to use GP Tween (c).
GP Tween (c) can resample strokes to a target exact point count and output them as a Bezier, Poly, Catmull-Rom or Nurbs stroke type. This accurate resampling is part of the Vector Drawing Assist Tools added in version 2.4.0. These tools appear exclusively in the top header when you are in Grease Pencil Edit mode, alongside improved stroke point visibility for unselected strokes on the current keyframe and one-click vector and auto align buttons for Bezier handles.
GP Tween (c) requests two permissions. It asks for file access to read and write the GP Tween nodegroup asset from and to disk, and clipboard access to copy and paste the GP Tween nodegroup. Both permissions relate to handling the Geometry Nodes group the add-on uses to generate interpolated frames between keyframes. Because the add-on builds its inbetweening on that nodegroup, being able to save, load, and copy it supports the interpolation and baking workflow.
GP Tween (c) is listed as free here and distributed under the GNU General Public License v3.0 or later, an open-source license. This catalog does not state a price, so for the current licensing terms, version history, and download options, check the developer's page at cosmosmythos.gumroad.com. Once you have it, you can install the add-on by dragging and dropping the extension into Blender or by downloading it and installing from disk, provided you are on Blender 4.3 or newer.
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