通过

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

  • 项目

Creates a cylindrical billboard that rotates around a specified axis.

Namespace: Microsoft.Xna.Framework
Assembly: Microsoft.Xna.Framework (in microsoft.xna.framework.dll)

Syntax

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

Parameters

  • objectPosition
    Position of the object the billboard will rotate around.
  • cameraPosition
    Position of the camera.
  • rotateAxis
    Axis to rotate the billboard around.
  • cameraForwardVector
    Optional forward vector of the camera.
  • objectForwardVector
    Optional forward vector of the object.

Return Value

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.

See Also

Reference

Matrix Structure
Matrix Members
Microsoft.Xna.Framework Namespace

Platforms

Xbox 360, Windows XP SP2, Windows Vista