# Mixed volume rendering and surface representation of segmentation has incorrect 3D appearance if segment is not fully opaque

**URL:** <https://discourse.slicer.org/t/mixed-volume-rendering-and-surface-representation-of-segmentation-has-incorrect-3d-appearance-if-segment-is-not-fully-opaque/6532>\
**Category:** Support\
**Tags:** volume-rendering\
**Created:** [April 17, 2019, 8:18pm UTC](https://discourse.slicer.org/t/mixed-volume-rendering-and-surface-representation-of-segmentation-has-incorrect-3d-appearance-if-segment-is-not-fully-opaque/6532 "2019-04-17T20:18:03Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![mikebind](https://avatars.discourse-cdn.com/v4/letter/m/71e660/32.png) [@mikebind](https://discourse.slicer.org/u/mikebind)\
**Post date:** [April 17, 2019, 9:43pm UTC](https://discourse.slicer.org/t/mixed-volume-rendering-and-surface-representation-of-segmentation-has-incorrect-3d-appearance-if-segment-is-not-fully-opaque/6532/3 "2019-04-17T21:43:29Z")

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Thanks, I hadn’t noticed this option before. However, this results in the segmented tube being semi-transparently rendered **in front of** the volume rendered image volume. Looks like this with depth peeling on:

 ![1%204_17_2019%202_40_03%20PM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/a/cace14ecabcead486f4b18efe94d9d88fb566ea5.jpeg)

(The tube should disappear from view as it enters the nose, hidden by the rendered image volume, as in the very first image attached above for the fully opaque image)

So, this changes, but **does not resolve the issue**. Thanks for the response, I very much appreciate it.

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_[View the full topic](https://discourse.slicer.org/t/mixed-volume-rendering-and-surface-representation-of-segmentation-has-incorrect-3d-appearance-if-segment-is-not-fully-opaque/6532)._