The answer really depends on what is meant by a three dimensional hexagon. The following are options for regular shapes.
1. The word polygon comes from Greek and the suffix "gon" refers to angles. If you think of a six-angled 3-d object, it would be two pyramids with their square bases joined together.
2. If you are thinking of a 3-d object with six faces, then it is a cube.
3. If you are thinking of a 3-d object each of whose faces is a hexagon, the answer is that such a figure cannot exist. The solid will "collapse" into a 2-d tessellation. The nearest you can get is the truncated icosahedron which is the shape of a soccer ball (or the C60 Buckminsterfullerene molecule). It comprises 12 regular pentagonal faces and 20 regular hexagonal faces.
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It would look a bit weird, but the only way to achieve this is by curving the sides or by making a concave hexagon.
it has seven sides and must look like a regular hexagon
no, because a quadrlateral has 6 sides and a hexagon has 4
pyramid
By tinting or shading it the correct way and making it look like there is another side to it