# 4 kinds of limb joint

**URL:** https://forums.synfig.org/t/4-kinds-of-limb-joint/17309
**Category:** Assets & Templates
**Created:** [September 20, 2026, 12:28pm UTC](https://forums.synfig.org/t/4-kinds-of-limb-joint/17309 "2026-09-20T12:28:53Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![robertojguerra](https://forums.synfig.org/user_avatar/forums.synfig.org/robertojguerra/32/8271_2.png) [@robertojguerra](https://forums.synfig.org/u/robertojguerra)
#### Post date: [September 20, 2026, 12:28pm UTC](https://forums.synfig.org/t/4-kinds-of-limb-joint/17309/1 "2026-09-20T12:28:53Z")

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[![](https://i.ytimg.com/vi/wXpVVoeShxA/hqdefault.jpg "limbs fused union") ](https://www.youtube.com/watch?v=wXpVVoeShxA)

In this video, pretend that the light red and blue are white. I use the circles to make the arcs match to each other

I took advantage that the outlines can be sent to the back, so we can play with visibility in many ways

1. “union”: all the lines in the intersecttion are hidden
2. lower limb on top of upper limb
3. same as 2 but with “asymmetric joint”
4. splitting each limb in 2 half, so that upper limb’s intersection line is visible when flexed to the left, and viceversa

[limbs fused union.sifz](https://forums.synfig.org/uploads/short-url/95IVmxhRUoM2oeQzKwqA1TAOnkG.sifz) (20.1 KB)

 ![hqdefault](https://forums.synfig.org/uploads/default/original/2X/3/3b7871d958597661b8099c6d754588166c7a0c9d.jpeg)