Hi,

I was reading the povray html manual about the camera for translating
effects. I read about the angle. Viewing angles bigger than 360 degrees
should give special fx, so I thought let's try. I use the standard
camera. The viewing angle had to be smaller than 180 degrees. Perhaps
this could be set in the manual?
I pulled it on 179 and added a clock, to see the differences, between
no angle and full angle.
Povray then seg faults when creating the vista light buffers.
I'm using Povray for Linux version 3.1g.linux.gcc.
A core is dumped, if anyone needs it, I can mail it.

Remco Poelstra

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In article <39513B4A.849565A7@home.nl>, Remco Poelstra 
<rjp### [at] homenl> wrote:

> I was reading the povray html manual about the camera for translating
> effects. I read about the angle. Viewing angles bigger than 360 degrees
> should give special fx, so I thought let's try. I use the standard
> camera. The viewing angle had to be smaller than 180 degrees. Perhaps
> this could be set in the manual?

It *is* in the manual:
4.4.2  Types of Projection
...
  If none is specified, the perspective  camera is the default.
...
Perspective projection:
... The viewing angle has to be larger than 0 degrees and smaller than 
180 degrees.
(severely clipped to save space)


> I pulled it on 179 and added a clock, to see the differences, between
> no angle and full angle.
> Povray then seg faults when creating the vista light buffers.

Does this happen without using clock? Have you tried using #debug to 
make sure your angle value is within the 0-180 range?

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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Chris Huff wrote:

> Perspective projection:
> ... The viewing angle has to be larger than 0 degrees and smaller than
> 180 degrees.
> (severely clipped to save space)
> 

I looked at the angle page of the camera, there it was not specified.
But you are right.

> > I pulled it on 179 and added a clock, to see the differences, between
> > no angle and full angle.
> > Povray then seg faults when creating the vista light buffers.
> 
> Does this happen without using clock? Have you tried using #debug to
> make sure your angle value is within the 0-180 range?
> 

Without clock everything is fine.
Well, it's a bit my error. When multiplexing angle with clock, the first
value is 0.
But I think povray should give a message if such an error is made (like
when you specify an angle >= 180) and not seg fault.

Remco Poelstra

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