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Bone Math

by Xury46·Workflow

Images © Xury46. Used for product review; image policy.

Why we like it

Bone Math earns its place for handling one specific rigging task, automatically calculating pole angles for IK bone chains, rather than a broad toolset. It holds a 5.0 rating across three reviews on Blender Extensions, and the first release ships at just 4.7 KB.

What is Bone Math?

Bone Math is a Blender add-on from Xury46 that brings helpful operators and math functions for working with bones and rigs. Its first release, version 0.1.0, includes an operator that automatically calculates pole angles for IK bone chains.

The pole angle operator is reached through the right-click context menu on the IK constraint pole angle field. The add-on requires no special permissions and weighs in at just 4.7 KB.

Bone Math is compatible with Blender 4.5 LTS and newer, and it's released under the GNU General Public License v3.0 or later. The source code and issue tracker live on the developer's GitHub page, and the extension can be added by dragging it into Blender or installing it from disk once you're on a supported version.

Who is Bone Math best for?

Bone Math is best for blender artists rigging characters who need to calculate pole angles for IK bone chains.

How much does Bone Math cost?

Bone Math is completely free to download and use.

Key features

  • Automatically calculates pole angles for IK bone chains
  • Pole angle operator accessed via the right-click context menu on the IK constraint pole angle field
  • Adds math functions for working with bones and rigs
  • Requires no special permissions
  • Compatible with Blender 4.5 LTS and newer
  • Distributed under the GNU General Public License v3.0 or later
  • Compact 4.7 KB add-on

Tags

#Blender#rigging#IK bone chains#pole angles#bones#add-on#animation

Frequently asked questions

Does Bone Math work with Blender 4.5?

Bone Math is compatible with Blender 4.5 LTS and newer, which is the minimum version required to install and run it. Version 0.1.0 was published on December 1st, 2025, and is the first release of the add-on. If you're on an older build of Blender, you'll need to update before the extension will work. The source code and issue tracker are hosted on the developer's GitHub page for anyone who wants to check details before installing.

How do I access the pole angle operator in Bone Math?

Bone Math's pole angle operator is accessed through the right-click context menu on the IK constraint pole angle field. From there, it automatically calculates pole angles for IK bone chains, which is the main feature of the 0.1.0 release. Beyond that operator, the add-on also brings math functions for working with bones and rigs. Its source code is available on the developer's GitHub page for anyone who wants more detail on how it fits into a rigging workflow.

How do I install Bone Math?

Bone Math can be installed by dragging and dropping the add-on into Blender, or by downloading it and using Blender's Install from Disk option. It's a compact package at 4.7 KB, and it targets Blender 4.5 LTS and newer, so make sure you're running a supported version first. After installation, the pole angle operator becomes available from the right-click context menu on the IK constraint pole angle field.

Is Bone Math free to use?

Bone Math is listed as free in this catalog, and it's released under the GNU General Public License v3.0 or later. The extension does not require special permissions to run. For the current licensing terms, source code, and any usage conditions, check the developer's GitHub page, where the add-on is maintained. You can download it and install it through Blender's drag-and-drop or install-from-disk options once you're on a compatible version.

Alternatives to Bone Math

Also in Workflow for Blender.

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