Here are some unsorted Blender tips.
Dimensions, Units and Clipping
If you import an unknown geometry it may be difficult to manipulate or even invisible. First check its dimensions:
- Select the object in the outliner
- Press N to open the view property panel and open the scene properties panel
- Set unit, scale and clip according to your geometry
- Middle mouse button: rotating
- Shift+middle mouse button: panning
- Tab: switch between object and mesh mode
- Numpad point: Center on the selection (object or mesh element)
- To enable circle selection press C
- To change the size of selection use the mouse wheel
- To quit the circle selection right-click
- To select left click and to unselect middle click
Circle selection is a good companion of rubber band selection (B key).
Here is how to flip normals. To display normal open press N to open the view property panel and check face normals.
Strangely dimensions given in mesh mode are 1000 times the dimension of object mode.
- Select, Non manifold (Shift+Ctrl+Alt+M): Select non manifold edges or vertices (depending of the current selection filter).
- Mesh, Vertices, Remove Doublons: Merge coincident vertices.
- Mesh, Faces, Beautiful Fill: Remesh to avoid skin faces. Use with care.
Moving a point along an edge
- Select the edge to move on
- Switch the 3D manipulator to normal
- View, align view, align view to selected, or Shift+numpad 1
- Select the vertex to move
- Switch the 3D manipulator to view
- Press G, Y, Y (or X, X) and move the mouse
Trimming by filling
- Select the edges to trim with. Most of the time they are free edges so they can be selected by selecting one and pressing shift+G (aka Similar).
- Copy this edges to a new mesh (Mesh, Vertices, Separate or the P key).
- Merge the edges mesh to the mesh to be trimmed (select both and press Ctrl+J or Object, Join).
- Delete faces which are inside the trimmed zone (use circle and border selection).
- Connect the trimming edges to the mesh using Mesh, Vertices, Merge or Alt+M.
- Select the contour to fill using Alt+right-click or Select, Edge Loop..
- Mesh, Faces, Fill or Alt+F
Trimming by boolean operation
Sometime it is easier to do trimming with using boolean operation, but boolean operation can only be done with at least one volume. Making a volume from a surface can be time-consuming. To do so:
- Create missing face border edges (select both vertices and press F).
- For each faces to create select the border edges, then press Alt+F (aka Fill). You may also make them f-gon (Mesh, Faces, make F-gon).
- Check and fix normals and non manifold elements.