"Ross Litscher" <rli### [at] everestkcnet> wrote in message
news:4051f355$1@news.povray.org...
> ...but i found a feature. I had a surface of revolution (sor) object
>
> the feature i found was, use "sturm"! it fixed it in all cases.
>
> I find it funny that the incorrectness when not using sturm was camera
> height dependent.  Have other people noticed this? I don't consider it a
> "bug" really, since pov has something to correct it already.

It's fairly well known by the more avid users in these newsgroups. Was a
topic of discussion several times in the past.

> Also, I was curious why the default value of sturm is "off". Does it
> significantly reduce speed in some cases?

I hadn't noticed any significant impact on render times by using 'sturm on'.
It could probably be changed to be on by default and not be nough to worry
about, especially since it could then be done as 'sturm off' anyway. That
keyword dates back to the earliest versions when computers were slow and it
just stayed that way for the more recent versions. I'd guess that the
average CPU power has quadrupled since back then.

Also the blob, lathe, and torus are the other primitives I'd think might be
okay to default to use the Sturmian root solver. Not sure about prism, poly
though. Perhaps they could all be done the same way. In fact, thinking this
over it might even be prudent to make sturm a global setting.

-- 
Bob H.
http://www.3digitaleyes.com

Post a reply to this message