# Transform inverse in transform chain

**URL:** <https://discourse.slicer.org/t/transform-inverse-in-transform-chain/8031>\
**Category:** Development\
**Created:** [August 14, 2019, 6:45pm UTC](https://discourse.slicer.org/t/transform-inverse-in-transform-chain/8031 "2019-08-14T18:45:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![adamrankin](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/adamrankin/32/155_2.png) [@adamrankin](https://discourse.slicer.org/u/adamrankin)\
**Post date:** [August 14, 2019, 6:45pm UTC](https://discourse.slicer.org/t/transform-inverse-in-transform-chain/8031/1 "2019-08-14T18:45:08Z")

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Hello all,

I am streaming transforms via IGTLink, so the transforms are changing in real-time. I am wondering if it’s possible to parent a transform by another transform, but inverted?

Adam

Edit: using the transform module GUI, I know it can be done in code manually

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [August 14, 2019, 7:34pm UTC](https://discourse.slicer.org/t/transform-inverse-in-transform-chain/8031/2 "2019-08-14T19:34:14Z")

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There is a transform processor module in SlicerIGT extension that can do this (invert, concatenate, compute relative transforms, constrain rotations, etc.).