On Mon, 6 Oct 2003 18:12:43 -0500, Hughes, B. <omn### [at] charternet> 
wrote:

> Wish I had my camera with me when I went out to the store the day after I
> last posted a reply here. The sunset was one of those beauts with plenty 
> of
> color. A very large blanket of clouds covered most of the sky and was 
> only a
> faint lavender color before the sun dropped below it, the air itself 
> looking
> lit by yellow sunlight, then it changed to purple with brilliant 
> orange-reds
> on the parts underneath. What made it interesting to me more than the 
> colors
> was how that single-layered cloud looked upside-down. It was as if it 
> were
> bubbling downward, with an appearance like cumulonimbus cloudtops jutting
> out below and into the sunshine out of the ever-darker purple. Whole 
> event
> lasted maybe 10 minutes.
>

I'm in the UK so weather here is completely predictable in being 
completely unpredicatable:)


> Anyway, yeah, if you could get clouds together with the background sky 
> it'd
> be a vast improvement.

As I said clouds and sun are the next step <sigh>

>
> In your pov script, which I tried again, I pointed the camera higher up
> rather than straight ahead. Your sunrise/sunset times (4:30 and 19:30) 
> has a
> black sky overhead, fairly sharp boundry too. IRL it never does that, 
> unless
> perhaps while in a high altitude airplane.

Hmm I could switch it for a dark blue

>
> Something to consider might be azimuth of sun position so that one side 
> of
> the sky has brighter colors than the opposite side. Just an additional
> semi-transparent pigment layer overlaid the main sky color pigment could 
> be
> used for that. Looks like that could be added at the final skysphere 
> using
> the Az variable which Sunpos() macro returns.
>
> Bob H.
>
>

Yeah something I realised this morning when watching the sunrise, 
colour_map runs right round the sphere so it's red or yellow opposite the 
sun as well which is not IRL. I was considering using the Az variable to 
tie into the colour_map settings or just tilt the map, but your way would 
be better.

What do you think, using -Al and Az as direction with a red, orange, 
yellow type texture, as the sun rises the texture sinks? That may allow 
the sky_sphere to just shift from blues to blacks.

Hmmm I'll give it a try when I've some time, completely rewriting a 
company website at the moment brains gone numb.

--
Phil

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