3d_modeling:blender:clean_up_occipital_3d_scan

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
3d_modeling:blender:clean_up_occipital_3d_scan [2021/10/13 00:23] – [Open the file] formlab3d_modeling:blender:clean_up_occipital_3d_scan [2021/10/13 03:07] (current) – [Auto-fix holes] formlab
Line 4: Line 4:
 This guide uses Blender, but here is a [[3d_modeling:meshmixer:clean_up_3d_scan|guide]] that describes this process for Meshmixer. This guide uses Blender, but here is a [[3d_modeling:meshmixer:clean_up_3d_scan|guide]] that describes this process for Meshmixer.
  
- +===== Basic cleanup =====  
-===== Open the file =====+==== Open the file ====
 The structure scanner delivers the 3D object in 3 parts: The structure scanner delivers the 3D object in 3 parts:
   * ''Model.obj'' is the 3D object   * ''Model.obj'' is the 3D object
Line 15: Line 15:
   * ''File > Import > Wavefront (obj)''. Choose the ''.obj'' file   * ''File > Import > Wavefront (obj)''. Choose the ''.obj'' file
  
-===== Setup the mesh =====+==== Setup the mesh ====
   - Make the mesh active (yellow contour lines instead of orange) ''left mouse click''   - Make the mesh active (yellow contour lines instead of orange) ''left mouse click''
   - Right click on the mesh and select ''Set Origin > Geometry to origin''.   - Right click on the mesh and select ''Set Origin > Geometry to origin''.
Line 22: Line 22:
  
 {{:3d_modeling:blender:01_montage_-_arrows.jpg|}} {{:3d_modeling:blender:01_montage_-_arrows.jpg|}}
-===== Join fragments to a single mesh =====+==== Join fragments to a single mesh ====
 The scan data coming from the Occipital Structure sensor isn't yet joined in a single mesh. It consists of multiple sections that overlap on the edges. To test this, hover the cursor over the object and go to ''Select > Select Linked > Linked'' (Shortcut: ''l'') (lower caps L). This selects all vertices that are linked. As you can see, only a single section is selected. The scan data coming from the Occipital Structure sensor isn't yet joined in a single mesh. It consists of multiple sections that overlap on the edges. To test this, hover the cursor over the object and go to ''Select > Select Linked > Linked'' (Shortcut: ''l'') (lower caps L). This selects all vertices that are linked. As you can see, only a single section is selected.
  
Line 30: Line 30:
 {{:3d_modeling:blender:02_setup_mesh_-_collage_-_arrows.jpg|}} {{:3d_modeling:blender:02_setup_mesh_-_collage_-_arrows.jpg|}}
  
 +==== Auto-fix holes ====
  
-===== Delete unwanted geometry =====+  * To see if there are any holes in the mesh, go in Edit mode and go to ''Select > Select All by Trait > Non manifold''. This will select all vertexes on the edges of holes: \\ {{:3d_modeling:blender:remesh_non_manifold_edges.png?400|}} 
 +  * {{:3d_modeling:blender:remesh_settings.png?400|}}\\ Apply a remesh modifier to the object and tune the parameters until the object is defined properly:\\ {{:3d_modeling:blender:remesh_remeshed.png?400|}} 
 +  * Try selecting the non-manifold vertexes again. If there are still some selected, repeat the above process, or export the object to Meshmixer to remesh it there. 
 + 
 +The 3D print add-on for Blender is helpful in preparing your object for 3D printing: enable the add-on ''3D-Print Toolbox'' in the Blender preferences. 
 +==== Delete unwanted geometry ====
 Cut away unwanted parts, like the surface the model was standing on. Cut away unwanted parts, like the surface the model was standing on.
   - Add a cube. Scale and position so it overlaps with the unwanted geometry.   - Add a cube. Scale and position so it overlaps with the unwanted geometry.
Line 50: Line 56:
  
  
-===== Redistribute vertices =====+===== More advanced cleanup =====  
 + 
 +==== Redistribute vertices ====
 The 3D scanner generates a mesh with messy topology. There are areas with very large faces, and others where there are lots of vertices crammed together. This creates visible stress points in the mesh. The relax function moves the vertices away from densely populated areas in order to be more equally distributed. Having the mesh relaxed will prevent a series of problems later on. This will change the shape of the mesh a little bit though. The 3D scanner generates a mesh with messy topology. There are areas with very large faces, and others where there are lots of vertices crammed together. This creates visible stress points in the mesh. The relax function moves the vertices away from densely populated areas in order to be more equally distributed. Having the mesh relaxed will prevent a series of problems later on. This will change the shape of the mesh a little bit though.
  
Line 57: Line 65:
 {{:3d_modeling:blender:03_delete_geometry_-_relax.gif|}} {{:3d_modeling:blender:03_delete_geometry_-_relax.gif|}}
  
-===== Manually Fill Holes =====+==== Manually Fill Holes ====
  
-==== Tiny Holes ====+=== Tiny Holes ===
 Fill tiny holes by merging vertices together. This way the texture will stay visible. Fill tiny holes by merging vertices together. This way the texture will stay visible.
  
Line 70: Line 78:
  
  
-==== Medium Holes ====+=== Medium Holes ===
  
-=== Clean up the edge ===+== Clean up the edge ==
   - Manually clean up the edges of the holes. The scanner tends to leave the edges of larger holes curved inward. Select and delete the connecting vertices. Then the excess surface is floating and can be deleted by hovering over it with the cursor and then pressing ''l'' (lower caps L) to select and then delete all linked vertices.   - Manually clean up the edges of the holes. The scanner tends to leave the edges of larger holes curved inward. Select and delete the connecting vertices. Then the excess surface is floating and can be deleted by hovering over it with the cursor and then pressing ''l'' (lower caps L) to select and then delete all linked vertices.
   - Merge together irregularities like outward or inward triangles. Try to make the edge of the hole somewhat smooth.   - Merge together irregularities like outward or inward triangles. Try to make the edge of the hole somewhat smooth.
Line 79: Line 87:
 {{:3d_modeling:blender:04_hole_fill_-_02_medium_-_delete_-_collage_arrows.jpg|}} {{:3d_modeling:blender:04_hole_fill_-_02_medium_-_delete_-_collage_arrows.jpg|}}
  
-=== Fill in the gap ===+== Fill in the gap ==
 - fill: ''Face > Fill'' (shortcut: ''alt + f'') - fill: ''Face > Fill'' (shortcut: ''alt + f'')
  
Line 85: Line 93:
  
  
-===== Retexture =====+==== Retexture ====
 New faces added to the mesh appear black or show random colours. They are referencing meaningless parts of the texture. Let's project the selected vertices to the texture and clone the surrounding texture onto that area. New faces added to the mesh appear black or show random colours. They are referencing meaningless parts of the texture. Let's project the selected vertices to the texture and clone the surrounding texture onto that area.
  
Line 141: Line 149:
 Retexturing is the same as described above. Retexturing is the same as described above.
  
-===== Normals =====+==== Normals ====
  
   - Go to edit mode and select all vertices   - Go to edit mode and select all vertices
  • 3d_modeling/blender/clean_up_occipital_3d_scan.1634109784.txt.gz
  • Last modified: 2021/10/13 00:23
  • by formlab