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Add a frame-change-post handler. this handler must update the scene - scene.update() so the data it deals with is valid before you start to operate on it. get the final calculated mesh and inspect its … normals. modify the original meshes vertex groups how you like. throw away the copy of the mesh, only generated to inspect normals. tag the mesh to be updated mesh.update_tag() and run scene.update() again …

This is possible to do without any addons or modifiers, Add a shape key Go into editmode Rotate one of the loops, say ~30deg Execute the Bridge Tool Remove the shape key. now the bridge will be tw …

Added twist offset option to the bridge tool r58609 (will be available in 2.69 or any recent build).

Mesh -> Vertices -> Connect (menu) JKey (shortcut) While the knife can be used for this purpose too, for quick cuts this is faster. This also works... …

Yes, this can be done. keep a single whole object(this is the reference for correct normals). enable auto-smooth on all broken parts(needed for custom normals to show). using the Normal Edit modifie …

Create a mesh out of flat surfaces and project each surface separately,see: Smart Project which automates this. … Unfold the mesh into UV-space (think of unfolding a paper-model), See the addon referenced here.Note that unfolding may only be of limited use for UV-mapping since it tends to create a lot of seams and …

In your case, it looks like the large ngon is tessellated (which in this case blender internally converts into skinny triangles before running the boolean function). So for better results you could m …

Heres a script (commands copied from executing them - macro style), you can run this in the python console or text editor. # select the face in edit-mode and run import bpy bpy.ops.mesh.subdivide(num …

In the case where the geometry is valid but there are too many redundant cuts in the mesh, Limited Dissolve works well. Select all, go to: Mesh -> Delete ->Limited Dissolve. …

To fully investigate the problem you may need debugging tools (debug builds etc), but as a user, here are some things you can do. The first thing to check on is Blenders memory statistics in the top …

While transforming the lengths of connected edges will show. But there is no way to make them display at all times.

If you don't want vertex normals to blend you can use sharp edges or enable auto-smooth in the mesh normals panel (which works in the view-port with version 2.71). …

Select the menu item Mesh -> Cleanup -> Delete Loose, options for verts/edges/faces. Blender 2.70 and later. …

You can do this by converting everything to a mesh. Object -> Convert -> To Mesh In the operator options you may want to enable Keep Original (so as not to replace the existing objects). …

First select all faces (typically selecting the entire mesh is fine). Access this menu item from the 3D View: Mesh -> Cleanup -> Degenerate Dissolve to remove zero area faces, zero length edges. …