by CDL Creative·Modeling
Images © CDL Creative. Used for product review; image policy.
Alchemesh earns its place in the Superhive library for combining armature retargeting, mesh deformation and data transfer around the PyGem library, with an extension version that keeps it working on Blender 4.2 and later.
Alchemesh is a Blender addon built around the PyGem library for retargeting bones and deforming meshes with precision. It handles armature and mesh deformation together, letting you transform and retarget multiple armatures and meshes in one go, which suits fitting outfits to different characters.
The workflow starts by selecting a source mesh as the base for deformation and a target mesh to deform into. From the deformation panel you add armatures and meshes to the list, set a proxy level to control detail (a lower number is more precise but slower), and choose a Radial Basis Function type, with Polyharmonic Spline set as the default. Clicking Deform applies the result for review and adjustment. Alongside deformation, Alchemesh transfers vertex weights between meshes for consistent deformation and copies shape keys between character models to keep facial expressions and other deformations consistent.
A newer extension version is available that ensures compatibility with future Blender releases and supports Blender 4.2 and beyond. This update also fixes missing dependencies. Users on the legacy version are advised to uninstall it before updating to the latest release.
Alchemesh is best for blender artists creating multiple character and mesh variations who need to retarget armatures, morph clothing and accessories, and keep weights and shape keys consistent across models.
Alchemesh is completely free to download and use.
Alchemesh has a newer extension version that ensures compatibility with future Blender releases and supports Blender 4.2 and beyond. If you previously bought and installed the legacy version, the developer advises uninstalling your current version and updating to the latest release to continue receiving support. This update also brings fixes for missing dependencies. Users still on the older build should move to the extension version to stay compatible with newer Blender releases and avoid the dependency issues addressed in the update.
Alchemesh Lite works by selecting a source mesh as the base for deformation and a target mesh to deform into. In the deformation panel you add the armatures and meshes you want to deform, set a proxy level to control detail (lower is more precise but slower), and choose a Radial Basis Function type, with Polyharmonic Spline as the default. Clicking the Deform button applies the deformation. Blender may appear to freeze during this, but you can check the console for progress updates. Afterward you can review and adjust for the best results.
Alchemesh includes data transfer for both. The vertex groups option syncs vertex groups (bone weights) from the source model to the target model, helping skeletal animations behave as expected. The shape keys option copies shape keys from the source model to the target model, overwriting any shape keys that currently exist on the target, so it should be used with caution. These transfers are useful if a vertex group was wiped or shape keys were accidentally overwritten, letting you restore consistent deformation across models.
Alchemesh is listed as free in this catalog. Because licensing terms can change, check the developer's page for the current details before you download and install. The listing references a legacy version that was previously purchased and installed, along with a newer extension version, so if you already own an earlier build, review the developer's guidance on uninstalling it and updating to the latest release to keep receiving support.
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