# SlicerDRRGenerator (lancelevine) — how to get lateral/oblique views? Rotation parameters undocumented

**URL:** <https://discourse.slicer.org/t/slicerdrrgenerator-lancelevine-how-to-get-lateral-oblique-views-rotation-parameters-undocumented/47824>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [August 7, 2026, 10:06am UTC](https://discourse.slicer.org/t/slicerdrrgenerator-lancelevine-how-to-get-lateral-oblique-views-rotation-parameters-undocumented/47824 "2026-08-07T10:06:46Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![anuragp2018](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/anuragp2018/32/77765_2.png) [@anuragp2018](https://discourse.slicer.org/u/anuragp2018)\
**Post date:** [August 7, 2026, 10:06am UTC](https://discourse.slicer.org/t/slicerdrrgenerator-lancelevine-how-to-get-lateral-oblique-views-rotation-parameters-undocumented/47824/1 "2026-08-07T10:06:46Z")

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Hi all,

I’m using the **SlicerDRRGenerator** extension ( [GitHub - lancelevine/SlicerDRRGenerator: A 3D Slicer extension that generates Digitally Reconstructed Radiographs · GitHub](http://github.com/lancelevine/SlicerDRRGenerator) ) to generate DRRs from a pelvis CT for comparison against intraoperative X-rays.

I’ve successfully generated an **AP view** using:

- Rotation: X=90, Y=0, Z=0
- Translation: X=0, Y=200, Z=0
- Center: 0,0,0
- Focal Point: 400, Threshold: 0, Direction: 2
- DRR Size: 512 x 494

This produces a clean AP radiograph of the pelvis. However, I can’t figure out the correct rotation values to get a **lateral** or **oblique** view. I’ve tried:

- X=90, Y=90, Z=0 → produces what looks like a superior/inferior (axial-style) view, not lateral
- X=90, Z=90, Y=0 → [describe what you got, or delete this line if you didn’t try it]

The module has no documentation on what the Rotation X/Y/Z, Center, or Direction parameters actually mean geometrically, and I haven’t been able to find this explained anywhere (checked the GitHub repo, the published paper ).

**Questions:**

1. Does anyone know the rotation convention this module uses (e.g., is it Euler angles applied in a specific order, and relative to which axis is “Direction: 2” defined)?
2. Has anyone successfully generated a lateral or oblique DRR with this specific module and can share working parameter values?

Thanks in advance!