# Importing to 3Ds max or Zbrush or Maya surfaces flip and become unvisible

**URL:** <https://discourse.slicer.org/t/importing-to-3ds-max-or-zbrush-or-maya-surfaces-flip-and-become-unvisible/7785>\
**Category:** Support\
**Created:** [July 28, 2019, 4:53am UTC](https://discourse.slicer.org/t/importing-to-3ds-max-or-zbrush-or-maya-surfaces-flip-and-become-unvisible/7785 "2019-07-28T04:53:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![NoobForSlicer](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/noobforslicer/32/10900_2.png) [@NoobForSlicer](https://discourse.slicer.org/u/NoobForSlicer)\
**Post date:** [July 28, 2019, 4:53am UTC](https://discourse.slicer.org/t/importing-to-3ds-max-or-zbrush-or-maya-surfaces-flip-and-become-unvisible/7785/1 "2019-07-28T04:53:28Z")

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So the surfacing is done inside out so when viewed from the outside in other software, it is transprent.

What could cause this?

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [July 28, 2019, 12:13pm UTC](https://discourse.slicer.org/t/importing-to-3ds-max-or-zbrush-or-maya-surfaces-flip-and-become-unvisible/7785/2 "2019-07-28T12:13:34Z")

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Probably the surface normals are inverted. Go to the Surface Toolbox module and re-calculate normals.

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**Author:** ![NoobForSlicer](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/noobforslicer/32/10900_2.png) [@NoobForSlicer](https://discourse.slicer.org/u/NoobForSlicer)\
**Post date:** [July 28, 2019, 3:53pm UTC](https://discourse.slicer.org/t/importing-to-3ds-max-or-zbrush-or-maya-surfaces-flip-and-become-unvisible/7785/3 "2019-07-28T15:53:31Z")

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yup that’s the solution 🙂 Thanks