# 3D View Rendering Problems

**URL:** <https://discourse.slicer.org/t/3d-view-rendering-problems/25424>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [September 24, 2022, 7:30pm UTC](https://discourse.slicer.org/t/3d-view-rendering-problems/25424 "2022-09-24T19:30:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![SlicerDK](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/slicerdk/32/16758_2.png) [@SlicerDK](https://discourse.slicer.org/u/SlicerDK)\
**Post date:** [September 24, 2022, 7:30pm UTC](https://discourse.slicer.org/t/3d-view-rendering-problems/25424/1 "2022-09-24T19:30:21Z")

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Hi everyone, I’m very new to Slicer and have found some bugs that I cannot find an explanation for. I’m using Slicer v5.0.3.

I’ll explain it in order of the steps I performed.

1. I used ‘Threshold’ to segment a tooth from a CBCT scan  

2. Turned off the ‘eye’ on that segment, created a new segment, and performed manual segmentation using the ‘Draw’ tool and ‘Fill between the Slices’.  

3. Now, I turned on both segments one by one, and that looks like one would expect  

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/e/4e756d5acc20fc4841aea3276e6e428cb83cc8ed.jpeg)

1. However, as soon as I turn off the ‘eye’ on the Thresholded segment, this is what remains of the Manual-slice-interpolated segment:  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/6/863a24309aed980402f306d74a068deab91b16ee.png)

All of the intersections have been subtracted somehow and there is no way to refresh the 3D view or load the original model back into memory.  
If I save it in this state and reopen, the SAME PROBLEM persists (intersections have automatically been subtracted). The only thing I can do is hit ‘Undo’ until the Segment is restored to what it was.

Please help me out on this! It’s utterly frustrating and I haven’t been able to find a solution to this so far.

Thanks and Regards,  
Deba.

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<div class="post-metadata">

**Author:** ![chir.set](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chir.set/32/66982_2.png) [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Post date:** [September 24, 2022, 7:56pm UTC](https://discourse.slicer.org/t/3d-view-rendering-problems/25424/2 "2022-09-24T19:56:13Z")

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Your second segment has eroded the first one, because you are using the default masking option.

You may use ‘Outside \* segments’ for ‘Editable area’, or use ‘Allow overlap’ for ‘Modify other segments’. I still get caught with this after 10 years !

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**Author:** ![SlicerDK](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/slicerdk/32/16758_2.png) [@SlicerDK](https://discourse.slicer.org/u/SlicerDK)\
**Post date:** [September 29, 2022, 1:20pm UTC](https://discourse.slicer.org/t/3d-view-rendering-problems/25424/3 "2022-09-29T13:20:07Z")

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Okay thank you so much! I do remember playing around with these, but I think I’ll have to properly understand what each of these settings actually do.