# Projecting 3D points onto the DRR image plane

**URL:** https://discourse.itk.org/t/projecting-3d-points-onto-the-drr-image-plane/3430
**Category:** Beginner Questions
**Created:** [September 3, 2020, 12:51pm UTC](https://discourse.itk.org/t/projecting-3d-points-onto-the-drr-image-plane/3430 "2020-09-03T12:51:55Z")
**Posts on this page:** 1
**Showing post:** 19

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### Author: ![dzenanz](https://discourse.itk.org/user_avatar/discourse.itk.org/dzenanz/32/1093_2.png) [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [September 21, 2020, 6:37pm UTC](https://discourse.itk.org/t/projecting-3d-points-onto-the-drr-image-plane/3430/19 "2020-09-21T18:37:58Z")

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Maybe you could employ `TransformPhysicalPointToIndex()`? See [discussion](https://discourse.itk.org/t/solved-transformindextophysicalpoint-manually/1031) for background.

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