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SharkD wrote:
> What real-world measurements do POV-Ray units represent. Do to the way
> interior media work, surely there must be a base-value of some sort.
Not really, because you can adjust the parameters for media and
other things arbitrarily, so there are no "physical constants" which
would allow you to derive the real-world scale even from the known
wavelength of the light. There might be some implicit assumptions
in some *default* parameters for this stuff, but I reckon they are
mostly "something which looks more or less reasonable".
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POVRay's units are just that... units. They bear no relationship to real
world units what so ever. I regularly change what they mean between
different scenes... If I am rendering a molecule, I might define that 1 unit
is a nanometer. If I am rendering a spaceship I'll probably use 1 unit= 1
meter... As an astronomer I often use 1 unit=1000Km...
Pick a scale that is appropriate for your scene... I'd suggest for scenes of
the normal human scale, 1 unit = 1 metre is a good baseline.
Rarius
"SharkD" <nomail@nomail> wrote in message
news:web.467a2fc15f1b9d1296f3cfc0@news.povray.org...
> What real-world measurements do POV-Ray units represent. Do to the way
> interior media work, surely there must be a base-value of some sort.
>
> -Mike
>
>
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Warp wrote:
> No, one unit corresponds to one unit, nothing else.
>
That's true, but...
The camera has an angle. Is this a real-world setting? If so, what does
one unit resemble most, considering a given camera angle? One inch, one
centimeter, a foot, etc?
I usually don't worry about this, but it appears that some people do.
There must be some answer which at least comes close.
~Sam
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From: Christian Froeschlin
Subject: Re: POV-Ray units of measurement
Date: 21 Jun 2007 16:16:57
Message: <467adcb9@news.povray.org>
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Samuel Benge wrote:
> The camera has an angle. Is this a real-world setting? If so, what does
> one unit resemble most, considering a given camera angle? One inch, one
> centimeter, a foot, etc?
Sorry, I don't think the question makes sense. How would the camera
angle determine the unit? If you think of applying trigonometry, you
will find that the distance from the camera is expressed in the same
units, so it just cancels out in the ratios.
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SharkD nous apporta ses lumieres en ce 2007/06/21 03:58:
> What real-world measurements do POV-Ray units represent. Do to the way
> interior media work, surely there must be a base-value of some sort.
>
> -Mike
>
>
POV units are purely arbitrary units. In a scene, one unit may be 1mm, while, in
another one, it can be 100 miles...
--
Alain
-------------------------------------------------
I'm interested in the fact that the less secure a man is, the more likely he is
to have extreme prejudice. (Clint Eastwood)
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Samuel Benge nous apporta ses lumieres en ce 2007/06/21 15:18:
> Warp wrote:
>> No, one unit corresponds to one unit, nothing else.
>>
>
> That's true, but...
>
> The camera has an angle. Is this a real-world setting? If so, what does
> one unit resemble most, considering a given camera angle? One inch, one
> centimeter, a foot, etc?
It depends at what distance you are from the camera. If the camera angle is 1
radiant, then at 1 unit distance, you cover 1 unit whide, 10 unit away, you see
10 units...
>
> I usually don't worry about this, but it appears that some people do.
> There must be some answer which at least comes close.
>
> ~Sam
An angle in completely independant from the unit used. 1 degree is always 1
dergee whatever mesurement system you use. 1 degree in imperial, american or
metric is exactly the same.
--
Alain
-------------------------------------------------
At twenty years of age the will reigns; at thirty, the wit; and at forty, the
judgment.
Benjamin Franklin
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Samuel Benge <stb### [at] thishotmail com> wrote:
> The camera has an angle. Is this a real-world setting?
It is as much a real-word setting as a 1 unit long object having half the
length of a 2 units long object, nothing more.
The angle simply tells the angle between directions of the extreme rays
sent from the camera.
> If so, what does
> one unit resemble most, considering a given camera angle?
Nothing. One unit is one unit, no less, no more. Camera angles do not
affect units.
--
- Warp
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Alain <ele### [at] netscapenet> wrote:
> POV units are purely arbitrary units. In a scene, one unit may be 1mm, while, in
> another one, it can be 100 miles...
It's not like the unit *is* eg. "1mm". It's just what you think it is.
If you design your scene thinking that 1 unit is 1mm, then that's fine,
but it's not like it would affect the rendering in any way.
--
- Warp
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SharkD wrote:
> What real-world measurements do POV-Ray units represent.
They represent whatever you want them to represent.
> Due to the way interior media work, surely there must be a base-value
of some sort.
Not really. The POV-Ray unit is sufficiently well-defined to getting
the code working correctly.
Regards,
John
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Being practical, POVray can render accurate images of
values beween 0.001 and 100k POV units, and so the
scale you choose should be picked to fit your scenes
values into this range. I prefer 1 unit per inch,
1 unit per foot, 1 unit per 10 feet, or 1 unit per mm;
but you can always combine them with scaling.
In particular it's difficult to fit spaceships and planets
into the same scale because of the large disparity in
size. In these cases you need to calculate the aspect
ratios and place scaled planets closer, so they still
appear on the screen as expected.
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