# area2d: 2D surface area In doolkit: Exploration of Dental Surface Topography

 area2d R Documentation

## 2D surface area

### Description

Compute the area of a 2d projection on the (xy) plane.

### Usage

```area2d(mesh, method = "concave")
```

### Arguments

 `mesh` object of class mesh3d `method` the method used to compute the hull of the 2d projection, either 'convex' (see `chull`), or 'concave' (see `concaveman`). The default method is 'concave'.

### Value

A single 2D surface area value, corresponding to the footprint of the mesh.

`rfi`

### Examples

```#The following objects should have the exact same footprints:
area2d(dkmodel\$basin)
area2d(dkmodel\$complex)
area2d(dkmodel\$cusp)
area2d(dkmodel\$flat)

#Graphical rendering of convex hull
x <- dkmodel\$cusp
FootprintVerts <- t(x\$vb[1:2, ])
Hull <- grDevices::chull(x = FootprintVerts[, 1], y = FootprintVerts[, 2])
plot(x\$vb[1, ], x\$vb[2, ], xlab = "x", ylab = "y")
points(x\$vb[1, Hull], x\$vb[2, Hull], col = "orange1")

#Graphical rendering of concave hull
x <- dkmodel\$cusp
FootprintVerts <- t(x\$vb[1:2, ])
FootprintVerts[, 1] <- FootprintVerts[, 1] - min(FootprintVerts[, 1])
FootprintVerts[, 2] <- FootprintVerts[, 2] - min(FootprintVerts[, 2])
Hull <- concaveman::concaveman(points = FootprintVerts)
plot(x\$vb[1, ] - min(x\$vb[1, ]), x\$vb[2, ] - min(x\$vb[2, ]), xlab = "x", ylab = "y")
points(Hull, col = "green1")
```

doolkit documentation built on May 14, 2022, 9:05 a.m.