# Calculates the area of the 2D convex hull of a projected plant

### Description

to be added

### Usage

1 | ```
Silhouette(obj, azimuth = NA, altitude = NA)
``` |

### Arguments

`obj` |
Either a |

`azimuth,altitude` |
Viewing azimuth and altitude (ignored if a projected plant is given as input). |

### Note

Not usually called by the user. Use instead, `STARbar`

and `projectplant`

.
For the latter, see the option `silhouette=TRUE`

.

### Author(s)

Remko Duursma

### See Also

`summary.plant3d`

,`STARbar`

,`projectplant`

### Examples

1 2 | ```
# Silhouette returns the area of the 2D convex hull (H), and the coordinates of the 2D hull (xyz):
Silhouette(sugarmaple, altitude=0, azimuth=45)
``` |