To define where the first square will be drawn we first need to divide one edge

To define where the first square will be drawn we

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define where the first square will be drawn, we first need to divide one edge into three segments. So right-click on the edge shown below on the left, and choose Dividefrom the popup menu. Move your mouse until you see three segments (as shown below on the right), then click.5.Activate the Offsettool, and move your mouse to the face below the edge that you divided (don’t click yet). The face should highlight with dots, and the next step is to click along one of the face’s edges. But where you click matters in this case: click anywhere on the left edge (the right edge would also work).
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The Menger Sponge in Google SketchUp3DVinci SketchUp Projects-of-the-MonthJuly 201046.Then move your mouse to the endpoint at the one-third point of the divided edge, and click again. You’ve just created a square within a square, whose edges are one-third as long as the edges of the cube face.7.With the Offsettool still active, double-click on the other two visible faces of the cube. This creates squares on those face that have the same offset distance.8.Now use Push/Pullto push each small square through to the opposite side. To make sure the push operation ends at the right place, click any point on the side where you want to stop.
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The Menger Sponge in Google SketchUp3DVinci SketchUp Projects-of-the-MonthJuly 20105When all three squares have been pushed through, you’ll have a few extra faces in the center of the cube.9.Before these faces can be erased, we need to create edges where they meet other faces. So select everything (press Ctrl+A for PC or Cmd+A for Mac), right-click on any selected face, and choose Intersect / Intersect with Model.10.You may not be able to tell that any edges were created, but they’re there. Each extra face inside the cube can be erased by first activating the Selecttool and clicking on the face, then pressing the Delete key. Look into the cube from the top, bottom, and sides, and make sure all inside faces are erased.
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