union doesn't work for me, it just makes the cube dissapear. Why?
blend file here: https://app.box.com/s/bf51u29w8sb7juc8lauhs61rdwz1ncsv
Thanks/ Dan
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$\begingroup$ The direction of the normals determines how the boolean operations work. Read: blender.stackexchange.com/a/50632/1853 $\endgroup$– user1853Aug 12, 2016 at 14:08
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$\begingroup$ You may also have a look to blender.stackexchange.com/questions/22/… $\endgroup$– lemonAug 12, 2016 at 17:44
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1 Answer
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You have to check the normals on your mesh (they should collectively point in one direction with respect to the surface) and it has to be a closed mesh (check for holes). Otherwise the modifier gets confused on what is on the outside and what is on the inside.
In this specific case the mirror modifier on the centerpiece of the steering wheel doesn't merge the vertices at the mirror axis. This results in the mesh being open in the center, thus confusing the boolean modifier.
Solution:
Increase merge limit on the mirror modifier to 0.1 or move the vertices in the center closer to the mirror axis
answered Aug 12, 2016 at 11:01