I can't see why the following scene won't render when changing "Value" to 1.5
or lower ...


// --------------------------------------------------------------------------
---------
background{
color rgb <1,1,1>
}

camera{
 location<-2.5,0,5>
 look_at<-2.5,0,0>

}
    sor {
        #declare Value=0.2
       5,
       <0.0,   -1.0>
       <0.0,   -0.5>
       <Value,   0.5>   // <------ change Value to 0.15 or lower ... and see
       <0.3,   1.0>
       <0.4,   1.5>
       rotate z*90
        pigment{color rgb 1}
    }
light_source{
<100,100,100>
color rgb <1,1,1>
}

// --------------------------------





--
Jan Walzer <jan### [at] lzernet>

Post a reply to this message

Difference viewing angles require different values for the object to
appear... I have no idea what's going on...

...Chambers

"Jan Walzer" <jan### [at] lzernet> wrote in message
news:3b9937ac@news.povray.org...
> I can't see why the following scene won't render when changing "Value" to
1.5
> or lower ...
>
>
>
// -------------------------------------------------------------------------
-
> ---------
> background{
> color rgb <1,1,1>
> }
>
> camera{
>  location<-2.5,0,5>
>  look_at<-2.5,0,0>
>
> }
>     sor {
>         #declare Value=0.2
>        5,
>        <0.0,   -1.0>
>        <0.0,   -0.5>
>        <Value,   0.5>   // <------ change Value to 0.15 or lower ... and
see
>        <0.3,   1.0>
>        <0.4,   1.5>
>        rotate z*90
>         pigment{color rgb 1}
>     }
> light_source{
> <100,100,100>
> color rgb <1,1,1>
> }
>
> // --------------------------------
>

>
>
>
> --
> Jan Walzer <jan### [at] lzernet>
>
>

Post a reply to this message

"Ben Chambers" <bdc### [at] hotmailcom> wrote:
> Difference viewing angles require different values for the object to
> appear... I have no idea what's going on...
>

So it is a bug ?

--
Jan Walzer <jan### [at] lzernet>

Post a reply to this message

"Jan Walzer" <jan### [at] lzernet> wrote in message
news:3b9b4a3a@news.povray.org...
> "Ben Chambers" <bdc### [at] hotmailcom> wrote:
> > Difference viewing angles require different values for the object to
> > appear... I have no idea what's going on...
> >
>
> So it is a bug ?
>
> --
> Jan Walzer <jan### [at] lzernet>

Beats me, I've been known to screw up big before :)  Maybe you're just
missing something obvious, and I'm missing the same thing...  Or maybe
someone with more technical know-how could help...  But, yes, it looks like
a bug to me.

...Chambers

Post a reply to this message

Hi,

I think it has to do with those two points at y=0. If you change the second
one two 0.1 it is possible to set Value to zero and it renders okay.
The docs say: "The difference is that the SOR object is less flexible
because it underlies the restrictions of any mathematical function, i.e. to
any given point y on the rotation axis belongs at most one function value,
i.e. one radius value." But you define to values for y=0 (-1 and -0.5).

Marc-Hendrik

Post a reply to this message

Marc-Hendrik Bremer schrieb in Nachricht <3b9bb071@news.povray.org>...
>But you define to values for y=0 (-1 and -0.5).


That is "two" of course.

Post a reply to this message