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I am following an example from a book using Boolean modifier to cut hole in an object. I have two 3D objects overlapping and when I apply "difference" operation, the first object disappears. It's only one edge of the first object that's causing this problem- when I move the second object to other edges it works.

I am very new to Blender, is there anyway I can attach my Blender file for all to see? Thank you

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  • $\begingroup$ the most common pitfalls for boolean problems are, in my experience: using objects without any depth, normals not outside on both objects, negative scale that make normals seem outside while thay are inside... $\endgroup$ – m.ardito Nov 16 '15 at 15:32
  • $\begingroup$ This is the file, can someone please have a look and see why the cabin disappears when the Boolean modifier is added to the cabin and cube on RHS.<img src="http://blend-exchange.giantcowfilms.com/embedImage.png?bid=646" /> $\endgroup$ – A Allen Nov 16 '15 at 16:19
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The reason the boolean operation fails is because you have duplicated geometry.

Enter edit mode, press A to Select All, then press the Space Bar and type Remove Doubles.

enter image description here

The boolean should work now as expected:

enter image description here

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  • $\begingroup$ Thank you. That works, although I don't understand how the geometry got doubled in the first place. $\endgroup$ – A Allen Nov 17 '15 at 5:41

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