====== Clean up a 3D scan made with the Occipital Structure scanner ======

The 3D files from the Structure scanner often have holes and unwanted geometry. After following this guide you'll get a watertight model that is ready for (colour) 3D printing. A basic understanding of mesh manipulation in Blender is necessary.
This guide uses Meshmixer, but here is a [[3d_modeling:blender:clean_up_occipital_3d_scan|guide]] that describes this process for Blender.

===== Open the file =====
The structure scanner delivers the 3D object in 3 parts:
  - ''Model.obj'' is the 3D object
  - ''Model.jpg'' is the texture file
  - ''Model.mtl'' is a file that links the object to the texture.
{{:structure_3d_scanner:cleanup_files.jpg?nolink|}}

You only have to open the ''.obj'' file. The program will find the other files on its own:
  - Click 'Import' and select the ''.obj'' file. Alternatively go to ''File > Import''.

=== Prepare model ===
  - Orient the model upright: ''Edit > Transform''.
  - Cut away unwanted geometry: ''Edit > Plane Cut''.
{{:3d_modeling:meshmixer:meshmixer_occipital_cleanup_01_import-and-cut_arrows.jpg|}}

=== Join disconnected sections ===
Objects from the structure scanner come in overlapping parts. This might cause problems for 3D printing.
  - Join the disconnected sections (blue lines indicate boundaries): ''Edit > Close Cracks''.
{{:3d_modeling:meshmixer:meshmixer_occipital_cleanup_02_close_cracks_arrows.jpg|}}

=== Delete loose parts ===
  - In ''Select'' mode, click anywhere on the part you want to keep.
  - Expand the selection to all connected vertices: ''e''.
  - Invert the selection: ''i''.
  - Delete the loose parts: ''x''.
{{:3d_modeling:meshmixer:meshmixer_occipital_cleanup_03_delete-loose_arrows.jpg|}}


  - Save your project(!)

=== Make the model 3D print ready ===
  - Make the mesh solid: ''Edit > Make Solid''.
      - Set the solid type to ''Accurate''
      - Increase Solid Accuracy and Mesh Density until you're happy with the result. Press Accept.
{{:3d_modeling:meshmixer:meshmixer_occipital_cleanup_04_make-solid_arrows.jpg|}}