I took redshift data compiled at Harvard University
(http://cfa-www.harvard.edu/~huchra/zcat/zbig.dat), and used it to calculate
a map of the universe...well, 5,000 stars at least :)

7-second xvid avi
320x240, 20fps

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Attachments:
Download 'redshift.avi.dat' (410 KB)

On Tue, 27 Jan 2004 23:49:21 -0800, "AngleWyrm"
<no_### [at] hotmailcom> wrote:
> 7-second xvid avi
> 320x240, 20fps

That's asking for troubles. I couldn't see it.

ABX

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"ABX" <abx### [at] abxartpl> wrote in message
news:s3re101gej242ovv1jciienqamjtvepdlv@4ax.com...
> On Tue, 27 Jan 2004 23:49:21 -0800, "AngleWyrm"
> <no_### [at] hotmailcom> wrote:
> > 7-second xvid avi
> > 320x240, 20fps
>
> That's asking for troubles. I couldn't see it.

If you don't have the free XVID codec, then maybe you have the Cinepack
Codec? Here it is, recompiled with a more common codec, but a bit larger.

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Attachments:
Download 'redshift.avi.dat' (676 KB)

On Wed, 28 Jan 2004 00:12:13 -0800, "AngleWyrm"
<no_### [at] hotmailcom> wrote:
> If you don't have the free XVID codec

If? I can trust to the POV-Team and install beta of it's product because I
know quality of POV-Ray, participate development myself and POV-Ray is not
vital for existence of my OS. But I hope it is understable that I do not trust
XVID which has unknown development, influences display capabilities of my OS
and exists in first RC form waiting for final release.

> then maybe you have the Cinepack Codec?

Yes, it works now. Thanks.

> Here it is, recompiled with a more common codec, but a bit larger.

Personally I do not mind downloading larger file if working with this file use
widely tested, commonly used, suported by outdated Media Player and NT4 codec.

Sorry, have no idea how to comment animation itself because you did not asked
anything ;-)

ABX

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"ABX" <abx### [at] abxartpl> wrote in message
news:a7te10hitb00clpi57liiajka6kbk1fckn@4ax.com...
> On Wed, 28 Jan 2004 00:12:13 -0800, "AngleWyrm"
> <no_### [at] hotmailcom> wrote:
> > If you don't have the free XVID codec
>
> If? I can trust to the POV-Team and install beta of it's product because I
> know quality of POV-Ray, participate development myself and POV-Ray is not
> vital for existence of my OS. But I hope it is understable that I do not
trust
> XVID which has unknown development, influences display capabilities of my
OS
> and exists in first RC form waiting for final release.

I like XVID better than DIVX; both provide excellent compression ratios, but
DIVX is corporate spyware, sponsored by Gaitor Advertizing Information
Network (GAIN).  XVID is opensource, so you can always see what they are
doing to it.

I understand there is a certain risk associated with products that claim to
be beta rather than final release; but wasn't POV-Ray v3.1 listed as beta
software? And it's been around since 1990, a good product that is
continually going through bug fixes, upgrades, and feature improvements.

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"ABX" <abx### [at] abxartpl> wrote in message
news:a7te10hitb00clpi57liiajka6kbk1fckn@4ax.com...

> Sorry, have no idea how to comment animation itself because you did not
asked
> anything ;-)

One thing I haven't figured out: How to animate the camera, do a camera
track. The scene here was generated as a union and then rotated. While this
might work, it didn't give me the effects I was really wanting.

What I wanted to do is have the camera orbit the scene in the x-z plane, and
perform a sinusoidal rise and fall during the course of the orbit, from
about +5y to -5y.

Anyone tell me how to do this?

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On Wed, 28 Jan 2004 01:05:10 -0800, "AngleWyrm"
<no_### [at] hotmailcom> wrote:
> XVID is opensource, so you can always see what they are doing to it.

If I would study sources of every tool I use to be sure they do not destroy my
stable environment I could have no time for using them :-)

> I understand there is a certain risk associated with products that claim to
> be beta rather than final release; but wasn't POV-Ray v3.1 listed as beta
> software?

I do not know what are you refering here because I do not remember that 3.1
was called "beta" all years before 3.5. But there is important difference
between POV-Ray and display related driver. I do not need POV-Ray to read its
scripts on this news server :-) And I do not need external codec to compress
script for sig ;-)

ABX
-- 
disc{z,-z#macro O()asc(substr("-+((1*(,1,/.-,*/(,&.323/'1"e 1))/10-4#declare
e=e-1;#end#local e=26;5pigment{#local g=function(_){ceil(_)-_}function#local
k=function{pattern{object{sphere_sweep{linear_spline 13#while(e)<O()O()>.01#
end}}}}{k(g(atan2(x,y)),g(ln(pow(x+y,2)+1e-5)),0)}}finish{ambient 1}}//ABX35

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On Wed, 28 Jan 2004 01:10:44 -0800, "AngleWyrm"
<no_### [at] hotmailcom> wrote:
> One thing I haven't figured out: How to animate the camera, do a camera
> track. The scene here was generated as a union and then rotated. While this
> might work, it didn't give me the effects I was really wanting.
>
> What I wanted to do is have the camera orbit the scene in the x-z plane, and
> perform a sinusoidal rise and fall during the course of the orbit, from
> about +5y to -5y.
>
> Anyone tell me how to do this?

The common way if to introduce some expressions into camera statement relative
to time expressed by value of 'clock' build-in variable. For example:

camera{
  location 3*x*clock
  look_at 2*y*clock
}

where camera goes along x axis and and looks at points on y axis. If your
movement is more complicated you can use splines or macros:

#declare S=spline{
  0 <0,0,0>
  1 <1,2,3>
  7 <11,25,-3>
}

#macro M(Time)
  #if(Time<2)
    <2,3,2*Time>
  #else
    <Time,2,Time*Time>
  #end
#end

camera{
  location S(clock)
  look_at M(clock)
}

Instead of applying any transformation to union which contain whole world you
can apply inversion of this transformation to camera.

ABX

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AngleWyrm wrote:
> I took redshift data compiled at Harvard University
> (http://cfa-www.harvard.edu/~huchra/zcat/zbig.dat), and used it to calculate
> a map of the universe...well, 5,000 stars at least :)

Oooh, I can fairly easily convert that data into a csv
to read with POV...the stars.inc I have now is just their
RA/decl position and magnitude, no distance, and it uses
POV rotational notation instead of RA/decl, so I can't
even figure out which stars are which just looking at it
(some day I'll write a macro to read the data and spit
back out RA/decl so I can add star names as a comment,
maybe)

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...except, there's a problem.

The RA and Dec have really really weird ranges,
and the Magnitude isn't listed for every star,
which there isn't any reason for it not to be,
and I'm not sure what 'z' is (if it's distance,
it's also got a really strange range.

*looks at the level above the .dat file*

Er...ok this isn't something terribly useful
to me, after all.

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