I finally found the problem with the outside=tdis bug in Fracton. Just like the cheesy &quot;who done it&quot; where the true villain isn&#39;t visible until the end, there was nothing wrong in the code I posted. The problem was FractInt doesn&#39;t use the last z for the tdis calculation when it bails out. In Fracton I did use it. That made a huge difference because the last value is usually one of the biggest. Now all of the FOTD images using outside=tdis work perfectly. Thanks to all who gave assistance. I was stuck thinking I was missing some code. Once that was eliminated, it was only a matter of time before I found the problem.<br>
<br>-- <br>Mike Frazier<br><a href="http://www.fracton.org">www.fracton.org</a><br>