POV-Ray : Newsgroups : povray.beta-test : Clock precision wrong? : Re: Clock precision wrong? Server Time
28 Sep 2024 12:46:37 EDT (-0400)
  Re: Clock precision wrong?  
From: Thorsten Froehlich
Date: 29 Jun 2011 17:00:05
Message: <4e0b9255@news.povray.org>
On 29.06.11 21:59, Warp wrote:
> Thorsten Froehlich<tho### [at] trfde>  wrote:
>> On 27.06.11 08:14, Warp wrote:
>>>     The difference is subtle, but exists.
>
>> Yes, at that point there will also be a difference in the computation. It
>> will be noticeable above 10 million frames (10**7), which is 46 hours for a
>> 60 fps animation. This is due to the clock value being transmitted as 32-bit
>> float while the computation is done with 64-bit floats. Thus, to see the
>> error, you need to exceed the precision limit of the 64-bit float, which is
>> about eight decimal digits greater than that of a 32-bit float.
>
>    Nope. All you need to do to get a noticeable rounding error is to see
> if the clock value in the final frame is 1.0.

??? As I said, you will see that error above roughly 10**7 frames.

	Thorsten


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