# Scrambled image when setting Oppacity \< 1 in an stl image

**URL:** <https://discourse.slicer.org/t/scrambled-image-when-setting-oppacity-1-in-an-stl-image/47533>\
**Category:** Support\
**Created:** [July 2, 2026, 4:12pm UTC](https://discourse.slicer.org/t/scrambled-image-when-setting-oppacity-1-in-an-stl-image/47533 "2026-07-02T16:12:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Octavio](https://avatars.discourse-cdn.com/v4/letter/o/45deac/32.png) [@Octavio](https://discourse.slicer.org/u/Octavio)\
**Post date:** [July 2, 2026, 4:12pm UTC](https://discourse.slicer.org/t/scrambled-image-when-setting-oppacity-1-in-an-stl-image/47533/1 "2026-07-02T16:12:39Z")

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Operating system: Windows  
Slicer version: 5.12.0 and 5.13.0-2026-06-30 r34833 / d401fce

Expected behavior: Display .stl surfaces when setting “Edit Properties”: Opacity \< 1.0  
Actual behavior:

Slicer fills the screen with a scrambled unrecognizable image. The behavior occurs with MRI-derived files I have tried, but even also with a simple example stl file like the cube in

> **[Sample STL files you can use for testing](https://ozeki.hu/p_1116-sample-stl-files-you-can-use-for-testing.html)**
>
> This page contains example STL files which can be used to test your 3D Debrecen or 3D Budapest Printer.

Thanks in advance for your help

Octavio