# [name]

A geometric triangle as defined by three vectors.

## Constructor

### [name]([page:Vector3 a], [page:Vector3 b], [page:Vector3 c])

a -- [page:Vector3]
b -- [page:Vector3]
c -- [page:Vector3]
Sets the triangle's vectors to the passed vectors.

## Properties

### [property:Vector3 a]

The first [page:Vector3] of the triangle.

### [property:Vector3 b]

The second [page:Vector3] of the triangle.

### [property:Vector3 c]

The third [page:Vector3] of the triangle.

## Methods

### [method:Triangle setFromPointsAndIndices]([page:Array points], [page:Integer i0], [page:Integer i1], [page:Integer i2]) [page:Triangle this]

points -- [page:Array] of [page:Vector3]s
i0 -- [page:Integer] index
i1 -- [page:Integer] index
i2 -- [page:Integer] index
Sets the triangle's vectors to the vectors in the array.

### [method:Triangle set]([page:Vector3 a], [page:Vector3 b], [page:Vector3 c]) [page:Triangle this]

a -- [page:Vector3]
b -- [page:Vector3]
c -- [page:Vector3]
Sets the triangle's vectors to the passed vectors.

### [method:Vector3 normal]([page:Vector3 optionalTarget])

optionalTarget -- Optional [page:Vector3] target to set the result.
Return the calculated normal of the triangle.

### [method:Vector3 barycoordFromPoint]([page:Vector3 point], [page:Vector3 optionalTarget])

point -- [page:Vector3]
optionalTarget -- Optional [page:Vector3] target to set the result.
Return a barycentric coordinate from the given vector.
[link:http://commons.wikimedia.org/wiki/File:Barycentric_coordinates_1.png](Picture of barycentric coordinates)

### [method:Triangle clone]()

Return a new copy of this triangle.

### [method:Float area]()

Return the area of the triangle.

### [method:Vector3 midpoint]([page:Vector3 optionalTarget])

optionalTarget -- Optional [page:Vector3] target to set the result.
Return the midpoint of the triangle. Optionally sets a target vector.

### [method:Boolean equals]([page:Triangle triangle])

triangle -- [page:Triangle]
Checks to see if two triangles are equal (share the same vectors).

### [method:Plane plane]([page:Plane optionalTarget])

optionalTarget -- Optional [page:Plane] target to set the result.
Return a [page:Plane plane] based on the triangle. Optionally sets a target plane.

### [method:Boolean containsPoint]([page:Vector3 point])

point -- [page:Vector3]
Checks to see if the passed vector is within the triangle.

### [method:Triangle copy]([page:Triangle triangle])

triangle -- [page:Triangle]
Copies the values of the vertices of the passed triangle to this triangle.

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]