[gameprogrammer] Re: calculating sun/moon position according to time
- From: Alan Wolfe <alan.wolfe@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Fri, 15 Jul 2011 09:11:40 -0700
Useless comment but yeah... i was doing this sort of thing at one point a
couple years ago too and after i worked out the math i realized that it
doesnt get darker linearly near sunset, it's "exponential" (well, really,
the shape is just a quadrant of a circle hehe).
I didn't believe it 100% so i paid attention the next time it was sunset and
realized it was in fact true.
Just thought it was interesting :P
On Fri, Jul 15, 2011 at 8:29 AM, Charlie Lobo <charlie.lobo@xxxxxxxxx>wrote:
> Hmm, well if you want the position of the sun in the sky (in radians) you'd
> do something like:
> time(in miliseconds) * 2*PI / 86400000
> Of course this doesn't matter when the sun is hidden
> If you want more elaborate sun movement, you have to consider that the
> sun's path "wobbles" from north to south as the year goes by due to the
> inclination of the planet's rotatoinal axis. It's also shifted north or
> southwards depending on the latitude.
>
>
> On Fri, Jul 15, 2011 at 10:22 AM, Roger Durañona Vargas
> <luo_hei@xxxxxxxx>wrote:
>
>> Im trying to implement a day/night cycle in my game with some sort of sun
>> movement affecting shadows, but I have faced a few problems. First I tried
>> to use Caelum, which is a plugin for Ogre which manages sky, sun,
>> precipitation, fog, etc, but the lack of help made me desist two times from
>> using it.
>> so, Im trying the basic approach, doing it myself. The problem is that I
>> dont know how to determine the position for the light source according to
>> the time to simulate the sun trajectory on the sky. Also, I havent found any
>> reference about the right parameters to simulate the light intensity and
>> color for different day times: morning, midday, dusk... Can somebody give me
>> a help?
>>
>> --
>> Roger D. Vargas
>> Using Gentoo Linux 2010
>> La unica forma de encontrar los limites de lo posible es yendo mas
>> alla de ellos, hacia lo imposible
>>
>>
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