# Facing issue with using Volume Rendering

**URL:** <https://discourse.slicer.org/t/facing-issue-with-using-volume-rendering/32695>\
**Category:** Support\
**Created:** [November 9, 2023, 4:38pm UTC](https://discourse.slicer.org/t/facing-issue-with-using-volume-rendering/32695 "2023-11-09T16:38:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Tondup\_Dolkar](https://avatars.discourse-cdn.com/v4/letter/t/dc4da7/32.png) [@Tondup\_Dolkar](https://discourse.slicer.org/u/Tondup_Dolkar)\
**Post date:** [November 9, 2023, 4:38pm UTC](https://discourse.slicer.org/t/facing-issue-with-using-volume-rendering/32695/1 "2023-11-09T16:38:50Z")

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Operating System: Windows  
Slicer version: 5.2.2

Hello Everyone,

I am new to 3D Slicer. I am trying to obtain an ROI by using crop function of volume rendering. Whenever I click the show volume button, the 3D object appears outside the cubical frame box. I used center view feature as well but nothing changes. Further, when I click the enable button or Display ROI button for cropping purpose, the 3D object totally disappears. What is the issue and how can I rectify it? Any assistance would be greatly appreciated.

Following are other details:  
Preset: CT-Coronary-Arteries-3  
Rendering: VTK GPU Ray Casting

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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:** [November 9, 2023, 4:43pm UTC](https://discourse.slicer.org/t/facing-issue-with-using-volume-rendering/32695/2 "2023-11-09T16:43:17Z")

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Most likely your volume is under a non-linear transform because it was loaded from a DICOM series that required regularization (tilted-gantry acquisition, missing slices, etc). Volume rendering ignores non-linear transform (in current Slicer version, we disable volume rendering in this case to avoid confusion).

You can harden the transform on the volume to avoid all the other unexpected behavior you described.

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**Author:** ![Tondup\_Dolkar](https://avatars.discourse-cdn.com/v4/letter/t/dc4da7/32.png) [@Tondup\_Dolkar](https://discourse.slicer.org/u/Tondup_Dolkar)\
**Post date:** [November 11, 2023, 9:50pm UTC](https://discourse.slicer.org/t/facing-issue-with-using-volume-rendering/32695/3 "2023-11-11T21:50:09Z")

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Hardening the transform worked. Thank you for your help.

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**Author:** ![Davide\_Punzo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/davide_punzo/32/66104_2.png) [@Davide\_Punzo](https://discourse.slicer.org/u/Davide_Punzo)\
**Post date:** [November 13, 2023, 8:28am UTC](https://discourse.slicer.org/t/facing-issue-with-using-volume-rendering/32695/4 "2023-11-13T08:28:06Z")

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NOTE: Support for regularization transform hardening in DICOM Scalar plugin has been added. See [link](https://discourse.slicer.org/t/enh-support-regularization-transform-hardening-in-dicom-scalar-plugin/32772).