# H3DU.Polyhedra

### H3DU.Polyhedra()

Contains helper methods for generating the five platonic solids and other polyhedra.

To use this class, you must include the script "extras/polyhedra.js"; the class is not included in the "h3du_min.js" file which makes up the HTML 3D Library. Example:

```
<script type="text/javascript" src="extras/polyhedra.js"></script>
```

### Methods

- dodecahedron

Generates a mesh of a regular dodecahedron or a sphere based on that solid. - dodecahedronFaces

Gets the vertices of a dodecahedron with maximum radius 1. - dodecahedronFacesCompact

Gets a more compact representation of the vertices of a dodecahedron with maximum radius 1. - hexahedron

Generates a mesh of a regular hexahedron (cube) or a sphere based on that solid. - hexahedronFaces

Gets the vertices of a hexahedron (cube) with maximum radius 1. - hexahedronFacesCompact

Gets a more compact representation of the vertices of a hexahedron (cube) with maximum radius 1. - icosahedron

Generates a mesh of a regular icosahedron or a sphere based on that solid. - icosahedronFaces

Gets the vertices of a regular icosahedron with maximum radius 1. - makeSphere

Modifies the vertices and indices of a solid to generate an approximation of a sphere. - normDistances

Normalizes the distance from the origin to each vertex in the given array to a fixed radius. - octahedron

Generates a mesh of a regular octahedron or a sphere based on that solid. - octahedronFaces

Gets the vertices of a regular octahedron with radius 1. - tetrahedron

Generates a mesh of a regular tetrahedron or a sphere based on that solid. - tetrahedronFaces

Gets the vertices of a tetrahedron with radius 1.

### (static) H3DU.Polyhedra.dodecahedron(radius, level)

Generates a mesh of a regular dodecahedron or a sphere based on that solid.

#### Parameters

`radius`

(Type: number)

Maximum radius from the center of the solid to one of its vertices.`level`

(Type: number)

If 0 or less, generates the solid as is. If 1 or greater, subdivides each triangle on the solid's surface into smaller triangles and makes them bulge out to form an approximation of a sphere (the bigger the number, the smaller the triangles).

#### Return Value

The generated solid. (Type: H3DU.MeshBuffer)

### (static) H3DU.Polyhedra.dodecahedronFaces()

Gets the vertices of a dodecahedron with maximum radius 1.

#### Return Value

A two-element array. The first element contains an array of the vertices that make up the solid (each vertex's X, Y, and Z coordinates are stored as three elements of that array), and the second element contains an array of vertex indices (multiplying each element by 3 will get the index to the first coordinate of the corresponding vertex in the first array). (Type: Array.<Array.<number>>)

### (static) H3DU.Polyhedra.dodecahedronFacesCompact()

Gets a more compact representation of the vertices of a dodecahedron with maximum radius 1.

#### Return Value

A two-element array. The first element contains an array of the vertices that make up the solid (each vertex's X, Y, and Z coordinates are stored as three elements of that array), and the second element contains an array of vertex indices (multiplying each element by 3 will get the index to the first coordinate of the corresponding vertex in the first array). (Type: Array.<Array.<number>>)

### (static) H3DU.Polyhedra.hexahedron(radius, level)

Generates a mesh of a regular hexahedron (cube) or a sphere based on that solid.

#### Parameters

`radius`

(Type: number)

Maximum radius from the center of the solid to one of its vertices.`level`

(Type: number)

If 0 or less, generates the solid as is. If 1 or greater, subdivides each triangle on the solid's surface into smaller triangles and makes them bulge out to form an approximation of a sphere (the bigger the number, the smaller the triangles).

#### Return Value

The generated solid. (Type: H3DU.MeshBuffer)

### (static) H3DU.Polyhedra.hexahedronFaces()

Gets the vertices of a hexahedron (cube) with maximum radius 1.

#### Return Value

A two-element array. The first element contains an array of the vertices that make up the solid (each vertex's X, Y, and Z coordinates are stored as three elements of that array), and the second element contains an array of vertex indices (multiplying each element by 3 will get the index to the first coordinate of the corresponding vertex in the first array). (Type: Array.<Array.<number>>)

### (static) H3DU.Polyhedra.hexahedronFacesCompact()

Gets a more compact representation of the vertices of a hexahedron (cube) with maximum radius 1.

#### Return Value

### (static) H3DU.Polyhedra.icosahedron(radius, level)

Generates a mesh of a regular icosahedron or a sphere based on that solid.

#### Parameters

`radius`

(Type: number)

Maximum radius from the center of the solid to one of its vertices.`level`

(Type: number)

If 0 or less, generates the solid as is. If 1 or greater, subdivides each triangle on the solid's surface into smaller triangles and makes them bulge out to form an approximation of a sphere (the bigger the number, the smaller the triangles).

#### Return Value

The generated solid. (Type: H3DU.MeshBuffer)

### (static) H3DU.Polyhedra.icosahedronFaces()

Gets the vertices of a regular icosahedron with maximum radius 1.

#### Return Value

### (static) H3DU.Polyhedra.makeSphere(vi, radius, level)

Modifies the vertices and indices of a solid to generate an approximation of a sphere.

#### Parameters

`vi`

(Type: Array.<Array.<number>>)

A two-element array. The first element contains an array of the vertices that make up the solid (each vertex's X, Y, and Z coordinates are stored as three elements of that array), and the second element contains an array of vertex indices (multiplying each element by 3 will get the index to the first coordinate of the corresponding vertex in the first array).`radius`

(Type: number)

Maximum radius from the center of the solid to one of its vertices.`level`

(Type: number)

If 0 or less, generates the solid as is. If 1 or greater, subdivides each triangle on the solid's surface into smaller triangles and makes them bulge out to form an approximation of a sphere (the bigger the number, the smaller the triangles).

#### Return Value

The "vi" parameter, which will likely be modified. (Type: Array.<Array.<number>>)

### (static) H3DU.Polyhedra.normDistances(vertices, radius)

Normalizes the distance from the origin to each vertex in the given array to a fixed radius.

#### Parameters

`vertices`

(Type: Array.<number>)

An array of vertices, where each vertex's X, Y, and Z coordinates are stored as three elements of that array.`radius`

(Type: number)

Distance from the origin where each vertex will be normalized to.

#### Return Value

Return value. (Type: Object)

### (static) H3DU.Polyhedra.octahedron(radius, level)

Generates a mesh of a regular octahedron or a sphere based on that solid.

#### Parameters

`radius`

(Type: number)

Maximum radius from the center of the solid to one of its vertices.`level`

(Type: number)

If 0 or less, generates the solid as is. If 1 or greater, subdivides each triangle on the solid's surface into smaller triangles and makes them bulge out to form an approximation of a sphere (the bigger the number, the smaller the triangles).

#### Return Value

The generated solid. (Type: H3DU.MeshBuffer)

### (static) H3DU.Polyhedra.octahedronFaces()

Gets the vertices of a regular octahedron with radius 1.

#### Return Value

### (static) H3DU.Polyhedra.tetrahedron(radius, level)

Generates a mesh of a regular tetrahedron or a sphere based on that solid.

#### Parameters

`radius`

(Type: number)

Maximum radius from the center of the solid to one of its vertices.`level`

(Type: number)

If 0 or less, generates the solid as is. If 1 or greater, subdivides each triangle on the solid's surface into smaller triangles and makes them bulge out to form an approximation of a sphere (the bigger the number, the smaller the triangles).

#### Return Value

The generated solid. (Type: H3DU.MeshBuffer)

### (static) H3DU.Polyhedra.tetrahedronFaces()

Gets the vertices of a tetrahedron with radius 1.