Since the face has two sides, the normal can point in either of two directions. The so-called normal is a vector perpendicular to the plane of the face. You can think of it as the “front” and “back” of the face. The problem in this case is that each face of your model has an orientation. Go into Edit Mode, select everything (press A), then press ctrl+N. If the problem still persists, you can recalculate the normals. Then press alt+M in order to merge the affected vertices. If that doesn’t help, in Edit Mode press ctrl+alt+shift+M. To fix this, go into Edit Mode, then press A to select all vertices, then press W and “Remove doubles”. that two vertices are positioned at the same location. One is that one or more vertices are duplicated, i.e. These show up as red lines and result in a model where two faces are not connected although they should be. Sometimes it so happens that a seemingly perfect model in Blender has unconnected edges in Pepakura. I work with the combination of Blender and Pepakura for creating paper models. Red lines (unconnected edges) in Pepakura The length of the curve will appear in a small message box. Select the macro from the list (select “Macros in” “all standard projects”) and click on “Execute”. To use the macro, select the relevant curve, then click on “Tools -> Visual Basic -> Execute…”. Paste the code at the bottom of this text file. Click on “GlobalMacros”, then on “Module” and “CorelMacros”. In order to make this work, go to the menu item “Tools -> Visual Basic -> Visual Basic editor…”. This should work in other versions of Corel Draw, too, but I could verify that for version 11 only. So in order to get that length, use this Visual Basic macro: Sub getLineLen() Since the curve may consist of straight and curved sections, this is not trivial, and unfortunately the user interface doesn’t help you here – it only tells you the width and height of an object. When designing in Corel Draw, it can be very useful to know the total length of a curve.
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