Článek
11/17/2011

Matrix.CreateBillboard Method (Vector3, Vector3, Vector3, Nullable<Vector3>)

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Creates a spherical billboard that rotates around a specified object position.

Namespace: Microsoft.Xna.Framework
Assembly: Microsoft.Xna.Framework.Math (in Microsoft.Xna.Framework.Math.dll)

Syntax

'Declaration
Public Shared Function CreateBillboard ( _
    objectPosition As Vector3, _
    cameraPosition As Vector3, _
    cameraUpVector As Vector3, _
    cameraForwardVector As Nullable(Of Vector3) _
) As Matrix

public static Matrix CreateBillboard(
    Vector3 objectPosition,
    Vector3 cameraPosition,
    Vector3 cameraUpVector,
    Nullable<Vector3> cameraForwardVector
)

Parameters

objectPosition
Type: Microsoft.Xna.Framework.Vector3
Position of the object the billboard will rotate around.

cameraPosition
Type: Microsoft.Xna.Framework.Vector3
Position of the camera.

cameraUpVector
Type: Microsoft.Xna.Framework.Vector3
The up vector of the camera.

cameraForwardVector
Type: System.Nullable<Vector3>
Optional forward vector of the camera.

Return Value

Type: Microsoft.Xna.Framework.Matrix
The created billboard matrix.

Remarks

This method computes the facing direction of the billboard from the object position and camera position. When the object and camera positions are too close, the matrix will not be accurate. To avoid this problem, the method uses the optional camera forward vector if the positions are too close.

Version Information

Silverlight

Supported in: 5

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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