by Nerk·Simulation
Images © Nerk. Used for product review; image policy.
RigFlex earns its place in the blender_extensions library for keeping soft body rigging deliberately simple — a first order simulation you bake down and revert, without wrangling collisions or overshoot.
RigFlex is an add-on by Nerk that adds simple soft body actions to parts of a rig inside Blender. It runs a stable, first order simulation aimed at armatures, with no collisions and no overshoot.
The workflow is straightforward. Select the deform bones you want affected and the keyframe range you're working with, then hit Bake to apply the soft body motion. Baking happens after the animation is done, and a Revert option removes the effect when you no longer need it.
RigFlex works with Blender 4.2 LTS and newer and requires no special permissions. It's released under the GNU General Public License v2.0 or later, and it sits at rank 139 in the blender_extensions library. Source and issue tracking are handled through the developer's GitHub page, where you can report problems or check version history.
RigFlex is best for blender riggers and animators who want to add simple soft body motion to selected bones and bake it into an existing animation.
RigFlex is completely free to download and use.
RigFlex is listed as compatible with Blender 4.2 LTS and newer, so on a 4.2 LTS release or a later version the add-on is intended to run in your setup. One user review notes trouble locating the add-on in a Blender 5.0 build, so if you're on a very recent version and can't find it, checking the developer's GitHub page for the current status and any updates is a sensible step before troubleshooting further.
RigFlex works from a simple bake-and-revert cycle. Once your animation is done, select the deform bones you want to affect and the keyframe range you're working with, then hit Bake to add the soft body motion across that range. If you want to take the effect back out, click Revert to remove it. The simulation is first order with no collisions and no overshoot, and baking after the animation keeps the process straightforward.
RigFlex is released under the GNU General Public License v2.0 or later, a copyleft open-source license that covers how you can use, modify, and redistribute the add-on. If you plan to build on the code or distribute a modified version, reviewing the full license terms and the source on the developer's GitHub page is worthwhile. The extension also requires no special permissions to run in Blender.
RigFlex is distributed as a small Blender extension zip. You can drag and drop the file into Blender, or download it and install from disk through Blender's extension preferences. It's listed as free in this catalog and released under an open-source license, so there's no purchase involved to add it to your setup. For the current terms and the latest version, check the developer's GitHub page.
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