# XMVectorBaryCentric method

Returns a point in Barycentric coordinates, using the specified position vectors.

## Syntax

```
XMVECTOR XMVectorBaryCentric(
[in] XMVECTOR Position0,
[in] XMVECTOR Position1,
[in] XMVECTOR Position2,
[in] float    f,
[in] float    g
);

```

## Parameters

Position0 [in]

First position.

Position1 [in]

Second position.

Position2 [in]

Third position.

f [in]

Weighting factor. See the remarks.

g [in]

Weighting factor. See the remarks.

## Return value

Returns the Barycentric coordinates.

## Remarks

This function provides a way to understand points in and around a triangle, independent of where the triangle is located. This function returns the resulting point by using the following equation: Position0> + f>(Position1-Position0>) + g>(Position2-Position0>).

Any point in the plane Position0>Position1>Position2> can be represented by the Barycentric coordinate (f>,g>), where f> controls how much Position1> gets weighted into the result, and g> controls how much Position2> gets weighted into the result. Lastly, 1-f>-g> controls how much Position0> gets weighted into the result.

Note the following relations.

• If (f>=0 && g>=0 && 1-f-g>=0), the point is inside the triangle Position0>Position1>Position2>.

• If (f==0 && g>=0 && 1-f-g>=0), the point is on the line Position0>Position2>.

• If (f>=0 && g==0 && 1-f-g>=0), the point is on the line Position0>Position1>.

• If (f>=0 && g>=0 && 1-f-g==0), the point is on the line Position1>Position2>.

Barycentric coordinates are a form of general coordinates. In this context, using Barycentric coordinates represents a change in coordinate systems. What holds true for Cartesian coordinates holds true for Barycentric coordinates.

### Platform Requirements

Microsoft Visual Studio 2010 or Microsoft Visual Studio 2012 with the Windows SDK for Windows 8. Supported for Win32 desktop apps, Windows Store apps, and Windows Phone 8 apps.

## Requirements

 Namespace Use DirectX. DirectXMath.h

## See also

Geometric Vector Functions
XMVectorBaryCentricV

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