# Surface details in segmenting **URL:** \ **Category:** Support\ **Created:** [September 20, 2018, 2:15am UTC](https://discourse.slicer.org/t/surface-details-in-segmenting/4154 "2018-09-20T02:15:34Z")\ **Posts on this page:** 1\ **Showing post:** 6

**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:** [September 20, 2018, 2:15pm UTC](https://discourse.slicer.org/t/surface-details-in-segmenting/4154/6 "2018-09-20T14:15:05Z")

The two visualizations are very different. What you segmented is a surface rendering of a surface model created from a labelmap of the segmentation. The image you pasted from the DICOM viewer is a volume rendering, which is a visualization technique directly from the volume. Read a bit on this here: > [@Save volume rendering as STL file](https://discourse.slicer.org/t/save-volume-rendering-as-stl-file/524): > > Hello, I am a new user on 3D slicer. I was using the display preset feature under volume rendering, and I was wondering if there is a way to save what I was viewing as an .stl or 3D printable file. For example, I was viewing a sample MRI using the CT-cardiac3 preset display. When I tried to save that specific 3D preset displayed sample in a .stl file, the option was unavailable. I was only able to see .vp (volume property), .txt formats. Is there a way to accomplish what I desire in 3D slic… The segmentation is mostly based on intensities, and is usually not perfect. Also the output of it is a binary mask volume (i.e. labelmap), which is by definition “not smooth”. You can do further smoothing in Segment Editor using the Smoothing effect, or you can increase the smoothing factor applied for the surface conversion under the small arrow next to the Show 3D button. --- _[View the full topic](https://discourse.slicer.org/t/surface-details-in-segmenting/4154)._