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

Creates a cylindrical billboard that rotates around a specified axis.

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

public static Matrix CreateConstrainedBillboard(
	Vector3 objectPosition,
	Vector3 cameraPosition,
	Vector3 rotateAxis,
	Nullable<Vector3> cameraForwardVector,
	Nullable<Vector3> objectForwardVector
)

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.
rotateAxis
Type: Microsoft.Xna.Framework.Vector3
Axis to rotate the billboard around.
cameraForwardVector
Type: System.Nullable<Vector3>
Optional forward vector of the camera.
objectForwardVector
Type: System.Nullable<Vector3>
Optional forward vector of the object.

Return Value

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

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.

Silverlight

Supported in: 5

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

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