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Hello,
I have an image and the total size looks like is 1 unit by 1 unit,
but I could not find why and,
what is the meaning of 1 unit?.
Is 1 unit each square pixel?
Thank you,
Maria
Post a reply to this message
Attachments:
Download 'imageforum.png' (107 KB)
Preview of image 'imageforum.png'
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"maria" <mar### [at] gmail com> wrote in message
news:web.49fde016c23a6d96c4fcbca0@news.povray.org...
> Hello,
> I have an image and the total size looks like is 1 unit by 1 unit,
> but I could not find why and,
> what is the meaning of 1 unit?.
> Is 1 unit each square pixel?
1 unit is whatever you want it to be: 1 meter, 1 mile, 1 lightyear, 1
nanometer
That being said, your first sentence isn't really clear. I suppose you mean
a height_field or an image_map? They're designed to by 1x1 unit in size by
default. Why? Because anything else would be kind of arbitrary.
cu!
--
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x) // ZK http://www.povplace.com
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On Sun, 3 May 2009 14:22:17 EDT, "maria" <mar### [at] gmailcom> wrote:
>Hello,
>I have an image and the total size looks like is 1 unit by 1 unit,
>but I could not find why and,
>what is the meaning of 1 unit?.
>Is 1 unit each square pixel?
>
Hi Maria and welcome,
A Pov unit is whatever you want it to mean :)
It has no relation to real life units so it can be one meter, one kilometre one
centimetre or even a foot, yard or mile.
There is a problem if you mix very small and large distances so a scale model of
the solar system is a no-no.
If you are using a heightfield then the image fits into a 1 by 1 by 1 cube. So
scale the X-Y axis's by the image resolution and the z axis by the desired
height.
--
Regards
Stephen
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web.49fde016c23a6d96c4fcbca0@news.povray.org...
> Hello,
> I have an image and the total size looks like is 1 unit by 1 unit,
It looks like it is 1x4x9
and ...oh my god it is full of stars !
Marc
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"maria" <mar### [at] gmailcom> wrote:
> Hello,
> I have an image and the total size looks like is 1 unit by 1 unit,
> but I could not find why and,
> what is the meaning of 1 unit?.
> Is 1 unit each square pixel?
>
> Thank you,
> Maria
Actually, the idea of '1 unit' in POV-Ray is itself kind of arbitrary--a sort of
internal standard; but there are *many* other things in the program that are
also based on that--for example, gradient x (or y or z) pigments and patterns,
etc. They repeat after '1 unit'--which makes the whole system nicely
consistent. Of course, practically anything in POV-Ray can be scaled up or
down, if you like, and over a very wide range--without losing resolution or
quality.
Ken W.
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"maria" <mar### [at] gmailcom> wrote:
> Is 1 unit each square pixel?
You might be confused about POV-Ray 'units' versus the screen resolution of your
rendered image. They actually have nothing at all to do with each other. In
other words, pixels on the screen have no relation to 'units' in POV-Ray; your
scene, as-is, can be rendered at any resolution. In fact, the larger the final
image in pixels, the nicer and sharper it will look. That's one of the great
things about the program!
KW
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