public RayDifferential TransformRayDifferential(RayDifferential r)
{
RayDifferential tr;
if (!_actuallyAnimated || r.Time <= _startTime)
{
tr = _startTransform.TransformRayDifferential(r);
}
else if (r.Time >= _endTime)
{
tr = _endTransform.TransformRayDifferential(r);
}
else
{
Transform t;
Interpolate(r.Time, out t);
tr = t.TransformRayDifferential(r);
}
tr.Time = r.Time;
return(tr);
}
