Basics of 3D modeling: how to make an icosahedron from paper
One of the most popular destinations in origamiis 3D modeling. Creating voluminous figures captures the attention not only of children, but also of adults. If you have already mastered the simplest schemes and techniques and learned to do at least a cube of paper, you can move on to more complex models. It is best to practice the creation of the so-called "Platonic solids". There are only five of them: a tetrahedron, an icosahedron, a hexahedron, a dodecahedron and an octahedron. All figures are regular polyhedra, based on the simplest geometric figures. Today you will learn how to make an icosahedron of paper.
List of materials and tools
- One sheet of thin colored cardboard (the preferred density is 220 g / m2).
- Sharp scissors or clerical knife.
- A simple pencil with HB hardness.
- Long wooden ruler (not less than 20 cm).
- Liquid PVA adhesive or pencil.
- Since making an icosahedron from paper without a sweepIt is impossible to find it and print it on a sheet or draw it by hand. The pattern is 20 equilateral triangles connected in a special sequence. On the free edges, it is necessary to provide small indents for gluing.
- You can start cutting. If you use a knife, be sure to work on a rubber mat for prototyping, so as not to damage the wooden surface of the table.
- If you want to avoid ugly kinks during assembly, you should walk along the bends lines with a sharp object. This will make the faces more distinct and smooth.
- Proceed to assembly. Apply an even layer of glue on the allowances and start forming the shape. Since it is very difficult to make an icosahedron from paper alone, it is better to ask for help from a friend. To ensure that the faces do not move apart, they must be held and simultaneously glued together with other parts. The model will acquire the final hardness at the very end of the assembly. Gluing the last two faces is the most difficult. Their allowances must converge inside the figure, and with a strong pressure, the shape may lose its elasticity. In order not to spoil the appearance of the icosahedron, the last side should be glued, without bending the edges to the end, and after gently pushing them inside.
If you have completely figured out how to do iticosahedron made of paper, you can practice the assembly of a more complex model - a truncated icosahedron. This figure consists of 32 faces: 12 equilateral pentagons and 20 regular hexagons. In the finished form and with the right coloring it looks very much like a football made of paper. The principle of assembly is similar, the differences are only in the template. The development of a truncated icosahedron is very difficult to build, so it's better to print it on a printer. The paper should be chosen very dense, otherwise the figure will not keep the shape, and deflections can occur at the pressure points.
Origami and 3D modeling are a great way to pass off a friendly or family evening. Such activities create a good intellectual background and help develop spatial imagination.