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what is a useful size to work with? what are the pro/cons in working with
1px=1 metre or 100px=1 metre?
what do you use and why?
thnx
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I generally use 1 unit = 1 meter, for no better reason than that I tend
to do starships, which are generally rather large objects. If I had to
measure them in centimeters, I'd go mad. If I tried to measure them in
milimeters, I might exceed the limits of POV's precision.
>what is a useful size to work with? what are the pro/cons in working with
>1px=1 metre or 100px=1 metre?
>what do you use and why?
>thnx
>
>
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In article <3d62becb@news.povray.org>,
> what is a useful size to work with? what are the pro/cons in working with
> 1px=1 metre or 100px=1 metre?
> what do you use and why?
"px"?
The units in POV have no relation to any specific real-world
measurement. Or to the generated image for that matter (it looks like
you might think they are related to pixels for some reason). A unit is
just a unit, you can use inches, millimeters, kilometers, miles, AU's,
light years...whatever makes the most sense. You do have to be careful
with the range of dimensions in your scene, computers have limited
available precision.
--
Christopher James Huff <cja### [at] earthlink net>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tag povray org
http://tag.povray.org/
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What are the limits? I dont thing I've ever used anything bigger then 10000
or closer to 0 then .001, but it would be nice to know.
BTW, I tend to use 1POV = 1inch for small items and 1POV = ~1ft. for large
structure typ object. IF you pland to distribute models or use other
peoples stick with 1POV = 1cm sence that is a pretty universal standard on
the net.
JFMILLER
"Dawn McKnight" <blu### [at] mac com> wrote in message
news:3D6### [at] mac com...
> I generally use 1 unit = 1 meter, for no better reason than that I tend
> to do starships, which are generally rather large objects. If I had to
> measure them in centimeters, I'd go mad. If I tried to measure them in
> milimeters, I might exceed the limits of POV's precision.
>
>
> >what is a useful size to work with? what are the pro/cons in working with
> >1px=1 metre or 100px=1 metre?
> >what do you use and why?
> >thnx
> >
> >
>
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sorry, I meant 1 unit
"Christopher James Huff" <chr### [at] mac com> wrote in message
news:chr### [at] netplex aussie org...
> In article <3d62becb@news.povray.org>,
>
> > what is a useful size to work with? what are the pro/cons in working
with
> > 1px=1 metre or 100px=1 metre?
> > what do you use and why?
>
> "px"?
> The units in POV have no relation to any specific real-world
> measurement. Or to the generated image for that matter (it looks like
> you might think they are related to pixels for some reason). A unit is
> just a unit, you can use inches, millimeters, kilometers, miles, AU's,
> light years...whatever makes the most sense. You do have to be careful
> with the range of dimensions in your scene, computers have limited
> available precision.
>
> --
> Christopher James Huff <cja### [at] earthlink net>
> http://home.earthlink.net/~cjameshuff/
> POV-Ray TAG: chr### [at] tag povray org
> http://tag.povray.org/
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In article <3d62eb32@news.povray.org>,
"jfmiller" <jfm### [at] hotmail com> wrote:
> What are the limits? I dont thing I've ever used anything bigger then 10000
> or closer to 0 then .001, but it would be nice to know.
The frame.h file defines two constants, Small_Tolerance and
Max_Distance. Small_Tolerance is 0.001, and is the closest an
intersection can get to the beginning of the ray before it is thrown
away, Max_Distance is 1.0e7 (or 10000000) and is the furthest an
intersection can get from the ray origin. There is also EPSILON which is
equal to 1.0e-10 (0.00000000001), anything < EPSILON is usually
considered 0. Some shapes define their own values...actually, I'm not
sure if the first two are actually used anywhere.
--
Christopher James Huff <cja### [at] earthlink net>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tag povray org
http://tag.povray.org/
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Christopher James Huff wrote:
> considered 0. Some shapes define their own values...actually, I'm not
> sure if the first two are actually used anywhere.
Unfortunately in blobs.cpp there is still defined DEPTH_TOLERANCE 1.0e-2
which quickly can lead to problems. So either be careful with small blobs
or change this constant and recompile.
- Micha
--
http://objects.povworld.org - the POV-Ray Objects Collection
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