That looks realy good Bob.  Time to animate. 

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"Steve" <ste### [at] zeroppsuklinuxnet> wrote in message
news:slr### [at] zero-ppslocaldomain...
| That looks realy good Bob.  Time to animate.

Thanks, but no thanks.  Not at 1 hour plus per frame.  Isn't going to
happen.

Bob

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Here's a changed version.  Added the ion tail and smoothed out the dust
tail, even made the coma smaller.  It can't be perfect I don't think, only
better and better (or worse, depending).
Want to credit Constantine Thomas, Kari Kivisalo, and James Hastings-Trew.
I just now got the Earthpng.zip file at Constantine's site which I
previously posted a reply to Christoph Hormann about.  I believe I had been
using the maps from David Seal's site before: http://maps.jpl.nasa.gov/

Bob

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Attachments:
Download 'nearearthcomet2.jpg' (13 KB)

Preview of image 'nearearthcomet2.jpg'

Bob Hughes wrote:
> 
> Here's a changed version.  Added the ion tail and smoothed out the dust
> tail, even made the coma smaller.  It can't be perfect I don't think, only
> better and better (or worse, depending).

better i think, just the tail should somehow thin out in the distance.  

> Want to credit Constantine Thomas, Kari Kivisalo, and James Hastings-Trew.
> I just now got the Earthpng.zip file at Constantine's site which I
> previously posted a reply to Christoph Hormann about.  I believe I had been
> using the maps from David Seal's site before: http://maps.jpl.nasa.gov/
> 

Thanks for the info, i got some similar maps lying around somewhere here but i
never used them in fact and i don't know where i got them from :-) 

Christoph 

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Bob Hughes wrote in message <3997f68b@news.povray.org>...
>Here's a changed version.  Added the ion tail and smoothed out the dust
>tail, even made the coma smaller.  It can't be perfect I don't think, only
>better and better (or worse, depending).
>Want to credit Constantine Thomas, Kari Kivisalo, and James Hastings-Trew.
>I just now got the Earthpng.zip file at Constantine's site which I
>previously posted a reply to Christoph Hormann about.  I believe I had been
>using the maps from David Seal's site before: http://maps.jpl.nasa.gov/
>


Now that's nice. Tail looks a bit long relative to the size of the
earth.  Maybe move the commet further from the earth.

Gail
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* http://www.rucus.ru.ac.za/~gail/ * Attempting to reboot universe *
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"Gail Shaw" <gsh### [at] monotixcoza> wrote in message
news:39980caa@news.povray.org...
|
| Now that's nice. Tail looks a bit long relative to the size of the
| earth.  Maybe move the comet further from the earth.

Thanks, but it's titled Near Earth Comet   :-)  As I understand it comets
can be quite large objects overall.
I think you and Christoph are right though, it needs some fading out as it
goes toward the far end.  It does at the very end, many times the length you
can see here, but not in a good way.  At the same time I need to get a
curvature for the dust tail too.  Somehow, someway.

Bob

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Looks better, but shouldn't the tail fade out in back?

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Now it looks much better.


Bob Hughes wrote:

> ... As I understand it comets can be quite large objects overall.

  Yes, indeed they can be hundred of times the earth radius.

> ...  At the same time I need to get a curvature for the dust tail too.  

  At the scale of your images I don't think that a curvature would be
noticeable. It also depends on the viewing angle and the vector velocity
of the comet.

Alberto.

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On Mon, 14 Aug 2000 11:14:50 -0500, Bob Hughes wrote:
>"Gail Shaw" <gsh### [at] monotixcoza> wrote in message
>news:39980caa@news.povray.org...
>|
>| Now that's nice. Tail looks a bit long relative to the size of the
>| earth.  Maybe move the comet further from the earth.
>
>Thanks, but it's titled Near Earth Comet   :-)  As I understand it comets
>can be quite large objects overall.
>I think you and Christoph are right though, it needs some fading out as it
>goes toward the far end.  It does at the very end, many times the length you
>can see here, but not in a good way.  At the same time I need to get a
>curvature for the dust tail too.  Somehow, someway.

If you put it far enough in the distance, and bring your other objects
closer, you could probably use the camera angle to bend the comet.  This
may involve scaling the object much bigger than it already is, but you
already know that don't you.

You could use a stand in solid object for the test renders untill you
get it the way you want. 

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Steve              email mailto:ste### [at] zeroppsuklinuxnet

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"Steve" <ste### [at] zeroppsuklinuxnet> wrote in message
news:slr### [at] zero-ppslocaldomain...
|
| If you put it far enough in the distance, and bring your other objects
| closer, you could probably use the camera angle to bend the comet.

Interesting workaround.  Problem is, I would know it's not actually curved
and that might bug me too much  :-)

Bob

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