[gameprogrammer] Re: calculating sun/moon position according to time
- From: 小梁 <bigdeal5609@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Tue, 19 Jul 2011 11:38:10 +0800
澳
Charlie Lobo <charlie.lobo@xxxxxxxxx>编写：
>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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