`mesh3d.Rd`

Creates meshes containing points, segments, triangles and quads.

```
mesh3d( x, y = NULL, z = NULL, vertices,
material = NULL,
normals = NULL, texcoords = NULL,
points = NULL, segments = NULL,
triangles = NULL, quads = NULL,
meshColor = c("vertices", "edges", "faces", "legacy"))
qmesh3d(vertices, indices, homogeneous = TRUE, material = NULL,
normals = NULL, texcoords = NULL,
meshColor = c("vertices", "edges", "faces", "legacy"))
tmesh3d(vertices, indices, homogeneous = TRUE, material = NULL,
normals = NULL, texcoords = NULL,
meshColor = c("vertices", "edges", "faces", "legacy"))
```

- x, y, z
coordinates. Any reasonable way of defining the coordinates is acceptable. See the function

`xyz.coords`

for details.- vertices
A 4 row matrix of homogeneous coordinates; takes precedence over

`x, y, z`

.- material
material properties for later rendering

- normals
normals at each vertex

- texcoords
texture coordinates at each vertex

- points
vector of indices of vertices to draw as points

- segments
2 x n matrix of indices of vertices to draw as segments

- triangles
3 x n matrix of indices of vertices to draw as triangles

- quads
4 x n matrix of indices of vertices to draw as quads

- indices
(obsolete) 3 or 4 x n matrix of vertex indices

- homogeneous
(obsolete) should

`tmesh3d`

and`qmesh3d`

vertices be assumed to be homogeneous?- meshColor
how should colours be interpreted? See details in

`shade3d`

.

These functions create `mesh3d`

objects, which consist of a matrix
of vertex coordinates together with a matrices of indices indicating how the vertices should be displayed, and
material properties.

The `"shape3d"`

class is a general class for shapes that can be plotted
by `dot3d`

, `wire3d`

or `shade3d`

.

The `"mesh3d"`

class is a class of objects that form meshes: the vertices
are in member `vb`

, as a 4 by `n`

matrix using
homogeneous coordinates. Indices of these vertices are
contained in optional components `ip`

for points,
`is`

for line segments, `it`

for triangles, and
`ib`

for quads.
Individual meshes may have any combination of these.

The functions `tmesh3d`

and `qmesh3d`

are included
for back-compatibility; they produce meshes of triangles and
quads respectively.

Objects of class ```
c("mesh3d",
"shape3d")
```

.

See `points3d`

for a discussion of texture coordinates.

`shade3d`

, `shapelist3d`

for multiple shapes