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From: Thorsten Froehlich
Subject: Re: Storing height_field mesh between frames of an animation
Date: 12 Mar 2007 13:10:01
Message: <45f59779$1@news.povray.org>
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scam wrote:
> But won't the image file need to be converted back into a mesh at parse
> time?
>
> Just to clarify, I have 5000x5000 pixel png image
That is at least 25 MB, even if it is compressed to like 12 MB, which do
take a second or two to read from disk alone - if you have a fast disk and
the file is stored linearly on disk!
Heightfields in POV-Ray are not converted to meshes.
Thorsten
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From: Alain
Subject: Re: Storing height_field mesh between frames of an animation
Date: 12 Mar 2007 18:04:52
Message: <45f5dc94$1@news.povray.org>
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Thorsten Froehlich nous apporta ses lumieres en ce 12-03-2007 14:10:
> scam wrote:
>> But won't the image file need to be converted back into a mesh at parse
>> time?
>> Just to clarify, I have 5000x5000 pixel png image
> That is at least 25 MB, even if it is compressed to like 12 MB, which do
> take a second or two to read from disk alone - if you have a fast disk and
> the file is stored linearly on disk!
> Heightfields in POV-Ray are not converted to meshes.
> Thorsten
Somebody know how to make a virtual drive in windows? That way, assuming that
you have enough RAM, the access will get a huge boost.
--
Alain
-------------------------------------------------
"The way England treats her prisoners, she doesn't deserve to have any."
--Oscar Wilde
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From: John VanSickle
Subject: Re: Storing height_field mesh between frames of an animation
Date: 12 Mar 2007 20:01:21
Message: <45f5f7e1$1@news.povray.org>
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Warp wrote:
> John VanSickle <evi### [at] hotmail com> wrote:
>
>>> There's no way of storing a heightfield in a file.
>
>
>>Sure you can. You have POV-Ray render the height_field with a gradient
>>texture running from rgb <0,0,0> to rgb <1,1,1>, with the hf_gray
>>setting on.
>
>
> That's not a heightfield, that's an image file. The heightfield will
> need to be generated from it. There's no advantage.
There is if an image-based height field parses faster than a
formula-based one.
Regards,
John
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From: Nicolas George
Subject: Re: Storing height_field mesh between frames of an animation
Date: 13 Mar 2007 08:20:26
Message: <45f6a51a@news.povray.org>
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Alain wrote in message <45f5dc94$1@news.povray.org>:
> Somebody know how to make a virtual drive in windows? That way, assuming that
> you have enough RAM, the access will get a huge boost.
That is not a good idea. If the file is read twice and there is enough
memory, the OS will keep it in memory, and the second read does not require
disc access. If there is not enough memory, the OS needs to free memory, and
discarding a cached file to re-read it later is cheaper than swapping
something out and later in.
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