/// <summary>
/// Returns the width of the camera's frustum at the specified distance from the camera.
/// </summary>
/// <param name="distance">Distance along the axis the camera is looking at, in world units.</param>
/// <returns>Frustum width, in world units. To find frustum height divide this by camera's aspect ratio. </returns>
public float GetFrustumWidth(float distance)
{
if (ProjectionType == ProjectionType.Perspective)
{
return(distance * 2.0f * MathEx.Tan(FieldOfView * 0.5f));
}
else
{
return(distance * 0.5f);
}
}