POV-Ray : Newsgroups : povray.beta-test : Clock precision wrong? : Re: Clock precision wrong? Server Time
1 Jun 2024 23:11:02 EDT (-0400)
  Re: Clock precision wrong?  
From: Thorsten Froehlich
Date: 27 Jun 2011 11:17:04
Message: <4e089ef0$1@news.povray.org>
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.

Due to the muliplication, this error will not accumulate though, hence you 
can see it, but it requires rather extreme applications. I think most would 
agree that the number of users that want to render 46 hour long animations 
are extremely rare.

	Thorsten


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