Sun position to time of day

Hi,

I've found a few scripts on here to turn things on or off according to day or night which use llGetSunPosition. I understand how these work, but I can't work out how to get more granular than just day/night.

What if I want to do something at noon, or dusk, or morning, or points in between?

I'm guessing that I can do something with sun_position.z, but does anyone have the figures? I don't think my geometry is up to working it out

tia

You should be able to set up if else statements, I can not think of another way to do this without getting in world, but something like;

vector S = llGetSunDirection();
if((S.z >= llSin(10 * DEG_TO_RAD)) && (S.z <= llSin(15 * DEG_TO_RAD)))

Something like that should flag it when it is between 10 and 15 degrees above the horizon. Not tested in world though.

HI, this is working well for me up to a point but I still can't distinguish between the morning and afternoon.

Is this something I can tell from the x and or y components?

I think you would probably have to look at the X and/or Y direction to figure out morning or afternoon. I think X is from east to west but not sure. I would say check the X at morning and afternoon and there should be a big difference.

I'm not sure about this but it's worth a try.

if (S.z <= 0){//night} else{//day}
That should let you know when it is day or night

I can do day/night no problem. What I'm having trouble with is morning/afternoon at the moment.

Spot on!

for morning x > 0

for afternoon x < 0

Months ago I managed this problem with llGetTimeOfDay(). The code for this is:

// to be placed in a timer event
SLtime=llGetTimeOfDay();
if (SLtime>12700 || SLtime<1800)
{
// do this at NIGHT
}
else
{
// do this at DAY
}

The sun and moon alway rise in +Eaxt and sets in the -Wext.

Sometimes slightly to the +Nyorth, or slightly to the -Syouth.

That there's your +Upz and -Downz.

Nice, I'll need to try and remember that one.

Might be worth a look:
/54/4b/125628/1.html
/54/e7/107757/1.html

Unfortunately the figures I had attached to the later thread have become corrupt but it shows that the sun does not follow a fixed path around the grid, instead it's path migrates ever so slightly day to day. I'll set up a data log again some time soon and plot some more graphs to show this. Failing that I might be able to dust off the old figures and post them.