# \#converter
**URL:** https://forums.synfig.org/tag/converter/145.md
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## [IK angle converter test](https://forums.synfig.org/t/ik-angle-converter-test/16552)
**Author:** [@zainal](https://forums.synfig.org/u/zainal)\
**Replies:** 31\
**Last updated:** [August 7, 2026, 10:41pm UTC](https://forums.synfig.org/t/ik-angle-converter-test/16552 "2026-08-07T22:41:33Z")
This is a new converter named IK Angle, designed to facilitate simple inverse kinematics (IK) setups .cpp and .h file: converter IK angle.zip (3.5 KB) demo:
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## [Converter development requirements](https://forums.synfig.org/t/converter-development-requirements/16608)
**Author:** [@zainal](https://forums.synfig.org/u/zainal)\
**Replies:** 3\
**Last updated:** [June 28, 2025, 8:00pm UTC](https://forums.synfig.org/t/converter-development-requirements/16608 "2025-06-28T20:00:41Z")
Are there any requirements I need to follow if I want to create a converter and submit a pull request?
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## [Angle to Real value](https://forums.synfig.org/t/angle-to-real-value/16321)
**Author:** [@zainal](https://forums.synfig.org/u/zainal)\
**Replies:** 5\
**Last updated:** [April 17, 2025, 10:34am UTC](https://forums.synfig.org/t/angle-to-real-value/16321 "2025-04-17T10:34:20Z")
Is there a way to read the calculation results in the form of an angle? For example, the result of atan2 is an angle. However, I need real data in a calculation, not in the form of an angle.
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## [Two circles sharing the same Y value while one circle follows a spline?](https://forums.synfig.org/t/two-circles-sharing-the-same-y-value-while-one-circle-follows-a-spline/15177)
**Author:** [@Ellilidot](https://forums.synfig.org/u/Ellilidot)\
**Replies:** 2\
**Last updated:** [June 26, 2024, 8:44am UTC](https://forums.synfig.org/t/two-circles-sharing-the-same-y-value-while-one-circle-follows-a-spline/15177 "2024-06-26T08:44:25Z")
I asked a similar question a couple days ago about only using the y variable of a circle. The thing is, I want the red circle to follow a spline as well, and it seems that I can’t do both at the same time. Is there any w…
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## [How to only add y value and ignore x value](https://forums.synfig.org/t/how-to-only-add-y-value-and-ignore-x-value/15163)
**Author:** [@Elilidot](https://forums.synfig.org/u/Elilidot)\
**Replies:** 2\
**Last updated:** [June 23, 2024, 2:00pm UTC](https://forums.synfig.org/t/how-to-only-add-y-value-and-ignore-x-value/15163 "2024-06-23T14:00:45Z")
Let’s say I have two circles. I want circle B to change its Y value when circle A moves up and down, but I don’t want circle B to change its X value as circle A moves sideways. Is there a way to do that?
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## ["Filling up" a shape](https://forums.synfig.org/t/filling-up-a-shape/3920)
**Author:** [@Thorn](https://forums.synfig.org/u/Thorn)\
**Replies:** 3\
**Last updated:** [June 24, 2016, 1:33am UTC](https://forums.synfig.org/t/filling-up-a-shape/3920 "2016-06-24T01:33:37Z")
Okay, please bear with… I am new at this and I freely admit to not knowing how most of it works. I’ve been through the basic tutorials and the more I do, the more sense it makes, but I am baffled on one thing in particu…
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## [Lottie to Synfig conversion script](https://forums.synfig.org/t/lottie-to-synfig-conversion-script/9973)
**Author:** [@Glax](https://forums.synfig.org/u/Glax)\
**Replies:** 9\
**Last updated:** [November 1, 2019, 8:51am UTC](https://forums.synfig.org/t/lottie-to-synfig-conversion-script/9973 "2019-11-01T08:51:55Z")
Not sure if it’s of interest, but I wrote a script that converts from lottie json into synfig animations. The code is https://gitlab.com/mattia.basaglia/tgs/ (the script itself is bin/lottie2sif.py) It doesn’t support …