/// <summary>
/// Extracts perspective camera parameters from the frustum, doesn't work with orthographic frustums.
/// </summary>
/// <returns>Perspective camera parameters from the frustum</returns>
public FrustumCameraParams GetCameraParams()
{
var corners = GetCorners();
var cameraParam = new FrustumCameraParams();
cameraParam.Position = Get3PlanesInterPoint(ref pRight, ref pTop, ref pLeft);
cameraParam.LookAtDir = pNear.Normal;
cameraParam.UpDir = Vector3.Normalize(Vector3.Cross(pRight.Normal, pNear.Normal));
cameraParam.FOV = (float)((Math.PI / 2.0 - Math.Acos(Vector3.Dot(pNear.Normal, pTop.Normal))) * 2);
cameraParam.AspectRatio = (corners[6] - corners[5]).Length() / (corners[4] - corners[5]).Length();
cameraParam.ZNear = (cameraParam.Position + (pNear.Normal * pNear.D)).Length();
cameraParam.ZFar = (cameraParam.Position + (pFar.Normal * pFar.D)).Length();
return(cameraParam);
}
/// <summary>
/// Creates a new frustum relaying on perspective camera parameters
/// </summary>
/// <param name="cameraParams">The camera params.</param>
/// <returns>The bounding frustum from camera params</returns>
public static BoundingFrustum FromCamera(FrustumCameraParams cameraParams)
{
return(FromCamera(cameraParams.Position, cameraParams.LookAtDir, cameraParams.UpDir, cameraParams.FOV, cameraParams.ZNear, cameraParams.ZFar, cameraParams.AspectRatio));
}