sky manager accuracy ->thumbs up

[Srek]

today i took some shots of the almost-full-moon rising

Why bother ;)

[georgedrakakis]

Why bother ;)

hehe, apart from the 100% accuracy confirmation, i wanted to show that i obviously need some haze-setup advices :)

[Bsouth]

Nice test - amazingly accurate

[Dtox]

Looks like you need some turbidity in the haze.

[paulselhi]

hmm.. I have used lat 40 long 23 and set the time to the date of your post 21.1.08 but am not getting close to your image



what are the your DS TZ and DS TZ settings ?

[georgedrakakis]

hmm.. I have used lat 40 long 23 and set the time to the date of your post 21.1.08 but am not getting close to your image
what are the your DS TZ and DS TZ settings ?

hi paulselhi, i've entered 40degN & 21degW (lat&long)
and Time zone=1, DS time zone=2.
oh, and my mistake, time was set to 17:45
i've attached the scene, along with an other animated setup of gradient fall-off, inspired by a question here at cgtalk.

edit: entering 18 feb 2008 @ around 18:00 you might see an almost full moon again.

[paulselhi]

Thanks for those scenes, i almots got what you had with some fiddling but i used E for the long when i see you used W ( my geography is very poor !!)

The moon looks a bit bleached but i am sure with some tweaking that can be fixed

Still it has been fun to visit greece.... virtually!!!

[georgedrakakis]

The moon looks a bit bleached but i am sure with some tweaking that can be fixed
Still it has been fun to visit greece.... virtually!!!
tnx Paul,
i think it's possible to drop a sphere or disk object mapped with a full moon texture ( of faking the phases with a proximal shader), in scene objects menu.
cheers,
george

[LemonNado]

I bet Srek was send around the globe with a Laptop running C4D to make sure that the SkyManager is running perfectly! The only thing missing is the significant air polution on the 'real' image. So.... V10.6 requires the addition of the Ploution slider to add that pesky haze...
Rainer

[Srek]

V10.6 requires the addition of the Ploution slider to add that pesky haze...
Well, measurements here in Botswana are progressing nicely, i hope to have finished Africa in a week or two, then off to south america

Cu
Björn

[Jorge Arango]

Well, measurements here in Botswana are progressing nicely, i hope to have finished Africa in a week or two, then off to south america

Cu
Björn


Waiting for you here...


Jorge Arango

[georgedrakakis]

well, i did some tests, uhm measurements :) ,with fog
http://i122.photobucket.com/albums/o271/studiomoccoro/full_haze_3.jpg

[georgedrakakis]

this shot is with today's date-> 19 feb @ 21:00.
funny thing happened:
i duplicated both the sky material & the environment object,
but i couldn't set individual settings such as date&time to each object, even when i unchecked the "enable" option in the basic tab.

http://i122.photobucket.com/albums/o271/studiomoccoro/19_feb_2008.jpg

[soccerrprp]

This is all interesting. BTW, Srek, I lived in Botswana (beautiful country!) for 4-years as US Peace Corps Volunteer! Long before I even knew the power of the internet and, of course, what 3D was.:)

Richard

[georgedrakakis]

Thanks for those scenes, i almots got what you had with some fiddling but i used E for the long when i see you used W ( my geography is very poor !!)

hi Paul,
actually it's E for long instead of W.
my mistake, i've only remembered the values not the orientation of lat/long, and that's what i'd entered. plus the time zone is UTC+2.
i tested it today, with the exact co-ords, and it was ok.

edit: next stop is eclipses :)

[Jorge Arango]

There was one last night visible here in the Americas. I think it started around 9:00 PM GMT-5.

(Didn't see it, was too cloudy)


Jorge Arango

[georgedrakakis]

hi Jorge, yes it was a total lunar eclipse (http://sunearth.gsfc.nasa.gov/eclipse/OH/OH2008.html). for these kind of eclipses earth's volume is needed, cause it's theshadow of the earth that's responsible for this phenomenon.

i tried to simulate a total solar eclipse, 29th of March 2006 (http://sunearth.gsfc.nasa.gov/eclipse/OH/OH2006.html#1).

in table 2 Africa, town Accra in Ghana (http://sunearth.gsfc.nasa.gov/eclipse/OH/LC/LC2006-1.html) has a total solar eclipse.
i tried but i could n't get it to work.

this is a table of lat/long (http://sunearth.gsfc.nasa.gov/eclipse/OH/path/Path2006.html#2006Mar29T) of the central line of the solar eclipse.

[georgedrakakis]

and a scene-file, if you wanna do your own tests.

[Jorge Arango]

hi Jorge, yes it was a total lunar eclipse (http://sunearth.gsfc.nasa.gov/eclipse/OH/OH2008.html). for these kind of eclipses earth's volume is needed, cause it's theshadow of the earth that's responsible for this phenomenon.

i tried to simulate a total solar eclipse, 29th of March 2006 (http://sunearth.gsfc.nasa.gov/eclipse/OH/OH2006.html#1).

in table 2 Africa, town Accra in Ghana (http://sunearth.gsfc.nasa.gov/eclipse/OH/LC/LC2006-1.html) has a total solar eclipse.
i tried but i could n't get it to work.

this is a table of lat/long (http://sunearth.gsfc.nasa.gov/eclipse/OH/path/Path2006.html#2006Mar29T) of the central line of the solar eclipse.

You're right, you'd have to create the earth, locate the camera on the surface of the earth, etc.


In your file, the eclipse happens at 0:10 hour. I don't understand why.


Jorge Arango

[georgedrakakis]

In your file, the eclipse happens at 0:10 hour. I don't understand why.
Jorge Arango

hi Jorge,
i did some animations and it seems that there is an offset of hour & position of the moon/sun.
1st example is from Accra, Ghana, & the 2nd is from Attaleia, Turkey.
i know that c4d ain't it's primary use for scientific purposes, but i am 100% sure that it definately got the potential to do it.

[georgedrakakis]

these are the animations of the eclipses.
(sorry for posting again, there is a limitation for attachments).
in the pic above, you can see the time of the eclipse for Attaleia, 12:40 Universal Time -> 14:40 for Attaleia (GMT +2).
the eclipse takes place around 10:00, (GMT -2), which is incorrect.

edit: another thing i've noticed is that if you inverse teh orientation
of the lat co-ords (N->S) the moon is on the right side of the sun, instead of the left side as seen in the animation.
i've seen videos of the actual ecplipse and the moon was on the right side indeed.

[georgedrakakis]

i did some tests with sky_shader_100, using r.9.6.
this is a screenshot @ 12:40 (Universal Time for the eclipse ->see attachment).
it's the closest i can get.
sky_shader_100 is more accurate in terms of positioning sun & moon,
the new sky shader can simulate better the luck of lighting during the eclipse, but with a time offset (Gmt-2, instead of Gmt+2).

i am not able to animate the time using sky_shader_100, (creating time line tracks and assign keyframes is more like a rocket science to me :) ), so i would appreciate if someone could animate the scene, from 11:00 to 13:00 .
you will need sky_shader_100_by_thomas_kunert (http://www.maxon.de/%7Ekunert/download/skyshader100.zip)
there are instructions for animating time in the plugin help.
edit: it's a r9.6 file

[Jorge Arango]

Maybe the inaccuracy is due to the fact that the camera in your tests is at 0,0,0 (center of the earth?).If you offset it by a distance equal to the earth radius it might work (and in this case, what are the coordinates of Accra? You know long and lat for Accra and even the equator for that hypothetical sphere (earth), but where is the Greenwich meridian?).

Just guessing.


Jorge Arango

[georgedrakakis]

Maybe the inaccuracy is due to the fact that the camera in your tests is at 0,0,0 (center of the earth?).If you offset it by a distance equal to the earth radius it might work (and in this case, what are the coordinates of Accra? You know long and lat for Accra and even the equator for that hypothetical sphere (earth), but where is the Greenwich meridian?).
Just guessing.
Jorge Arango

hi Jorge,
i had to guess too.
i assumed that 0,0,0, was the lat/long co-ords.
anyway, it's written in the manual that the sky object is not suited for precise simulations.

[paulselhi]

Can SKY do precession of the equinoxes ? If not then i must say this a pretty poor implementation :rolleyes:

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