# How to shrink OBJ file size?

**URL:** <https://discourse.slicer.org/t/how-to-shrink-obj-file-size/9107>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [November 12, 2019, 12:11am UTC](https://discourse.slicer.org/t/how-to-shrink-obj-file-size/9107 "2019-11-12T00:11:03Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Coloradoultrasound](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/coloradoultrasound/32/3835_2.png) [@Coloradoultrasound](https://discourse.slicer.org/u/Coloradoultrasound)\
**Post date:** [November 12, 2019, 12:11am UTC](https://discourse.slicer.org/t/how-to-shrink-obj-file-size/9107/1 "2019-11-12T00:11:03Z")

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Hello, I am trying to figure out how to reduce file size of an OBJ from the segment editor. Is there a way to easily do this?

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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 12, 2019, 12:44am UTC](https://discourse.slicer.org/t/how-to-shrink-obj-file-size/9107/2 "2019-11-12T00:44:14Z")

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Mesh decimation is available in Segment Editor - see detailed instructions [here](https://discourse.slicer.org/t/size-of-stl-obj-files-too-many-triangles/5137/2).

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<div class="post-metadata">

**Author:** ![Coloradoultrasound](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/coloradoultrasound/32/3835_2.png) [@Coloradoultrasound](https://discourse.slicer.org/u/Coloradoultrasound)\
**Post date:** [November 12, 2019, 11:40pm UTC](https://discourse.slicer.org/t/how-to-shrink-obj-file-size/9107/3 "2019-11-12T23:40:09Z")

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Hello, is there a way to trim or edit the volume before using threshold to paint it? I’d like to be able to trim the volume before painting to improve clarity? It would be nice to be able to remove some of the noise beforehand.

 ![Picture1](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/5/a58757772bfd6d198add8ad98eef7c9ed4401f6a.png)

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<div class="post-metadata">

**Author:** ![Coloradoultrasound](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/coloradoultrasound/32/3835_2.png) [@Coloradoultrasound](https://discourse.slicer.org/u/Coloradoultrasound)\
**Post date:** [November 12, 2019, 11:41pm UTC](https://discourse.slicer.org/t/how-to-shrink-obj-file-size/9107/4 "2019-11-12T23:41:52Z")

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![Picture1](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/c/4c9c902113bfd3df0e6eafc8ca3bb479d26f83da.png)

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<div class="post-metadata">

**Author:** ![Coloradoultrasound](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/coloradoultrasound/32/3835_2.png) [@Coloradoultrasound](https://discourse.slicer.org/u/Coloradoultrasound)\
**Post date:** [November 13, 2019, 7:34pm UTC](https://discourse.slicer.org/t/how-to-shrink-obj-file-size/9107/5 "2019-11-13T19:34:03Z")

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Hello again,

I am also running into an issue where using the scissors to cut the segment are not cutting out the small particles as shown here. Why would there be any particles remaining after Erasing all outside?

 ![Picture1](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/a/9a047d07c39daa1c6dd4aca8125eca844a67bff4.png)

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<div class="post-metadata">

**Author:** ![Sunderlandkyl](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sunderlandkyl/32/79987_2.png) [@Sunderlandkyl](https://discourse.slicer.org/u/Sunderlandkyl)\
**Post date:** [November 13, 2019, 9:21pm UTC](https://discourse.slicer.org/t/how-to-shrink-obj-file-size/9107/6 "2019-11-13T21:21:24Z")

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You can trim the volume beforehand using the “Crop Volume” module.

Probably the reason there are small particles is that they are outside the editable intensity range. Try unchecking the editable intensity range in the masking options.