POV-Ray : Newsgroups : povray.documentation.inbuilt : Animation docs inaccurate : Re: Animation docs inaccurate Server Time
30 May 2023 03:19:50 EDT (-0400)
  Re: Animation docs inaccurate  
From: clipka
Date: 21 Dec 2016 02:26:46
Message: <585a2eb6$1@news.povray.org>
Am 21.12.2016 um 07:58 schrieb omniverse:
> clipka <ano### [at] anonymousorg> wrote:
>> Am 21.12.2016 um 06:49 schrieb omniverse:
>>> Just looked at what clock says it is when trying equal frames.
>>> -nan(ind)
>>> Not a number (with a dash, minus??), but I don't know what the ind means.
>>> Thought you probably would.
>> Yes: "Indeterminate". Meaning that the expression has no solution at all
>> (not even infinity), or that it has more than one solution (typically
>> infinitely many).
> --->8 ok 8<---
>> Not sure what that minus sign means. Might be just an intrinsic part of
>> the way "Not-a-Number" values are reported, or might actually mean
>> _something_. Maybe the IEEE would know.
> Curiously, the clock was put in as a light_source color when I tried this.
> Thought maybe it went to -1 and luckily I used a simple candle scene, lit
> externally by that other light, so the flame light should have still been there.
> Tried -1 instead of clock and the flame light was still there, just not the same
> as with the NaN clock! Found it takes more like -100 to get the equivalent
> appearance, extinguishing the flame entirely. Difficult to know exactly but -50
> was ever so slightly different on the wick and melted wax edges.
> Try and explain that. Why would it equate to approximately -100 for a
> light_source? Anyway... going astray I fear.  ;)

"NaN" values propagate through every computation they take part in --
until they are converted to integer values, at which point their effect
depends on what compiler was used to build the application, what
compiler settings were used, and what colour your socks are.

In POV-Ray, that point is the actual writing of the output image file
(or display in the preview window), and the result will typically be
either bright white or pitch black pixels.

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