[gameprogrammer] Re: calculating sun/moon position according to time
- From: Charlie Lobo <charlie.lobo@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Fri, 15 Jul 2011 15:21:10 -0500
So sunlight would be simulated with a directional light, the direction
defined by the angles. Also limiting the arc in the sky doesn't fully
prevent near-infinite shadows, it's perfectly possible to have an inclined
plane that allows for this. Limiting the light-range is something you'd have
to experiment to find the results closest to 0 and PI degrees that still
give reasonable results (depends on how ogre handles shadows, and what kind
of sufraces you are handling, neither of which I know).
I haven't said anything about the reasonable parameters for light color and
intensity at diferent daytimes. This is the most I've found with a quick
google http://www.spc.noaa.gov/publications/corfidi/sunset/
Have no idea what good RGB values would be. Sorry about not having more but
hope it can help.
On Fri, Jul 15, 2011 at 11:12 AM, Roger Durañona Vargas <luo_hei@xxxxxxxx>wrote:
> On 15/07/11 11:29, Charlie Lobo 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.
>>
> Well, I just need a basic path east/west, and also limit de arc to a sky
> section to avoid the light reaching horizont level, that could cause objects
> to cast near-infinite shadows, which are a big mess in Ogre.
>
>
>
> --
> 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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