REQ>Sun Position-Time of Day and Geographic Data

joegiampaoli · Post by **joegiampaoli** » Fri Aug 10, 2007 4:57 pm

I'm not sure if this has been requested before or not, also I think it's more of an exporter thing than indigo core system.

Is there a way to precisely know what my sun position and angle in blender for example could represent an exact time of day and geographical place?

Kram1032 · Post by **Kram1032** » Fri Aug 10, 2007 11:50 pm

hum...

hard...

1) north south east west isn't defined - you can't make it 100% accurate
2) at the same time in the same timezone, the sun stands differently, 'cause of the north-south cordinates... (and the season)

you might find sort of a calculator, for that, or simmilar, dunno.
Or if you (or someone else) finds a formula, you can use that, yourself, then.

...definately possible, if you do it correctly

suvakas · Post by **suvakas** » Fri Aug 10, 2007 11:57 pm

This is implemented in 3ds Max (don't know how acurately Indigo renders it though)

mrCarnivore · Post by **mrCarnivore** » Fri Aug 10, 2007 11:59 pm

I think that should be part of the 3d-prog or the exporter...

you would have to define GPS coordinates, the exact date and time and the direction where north is in your render (or default that to the poitive x-axis or something else). The rest should be pretty easily calculatable.

Haven't found a formula, though. (Haven't looked for it tbh.

)

Caronte · Post by **Caronte** » Sat Aug 11, 2007 12:02 am

Kram1032 wrote:you can't make it 100% accurate

Wrong.
Several softwares have that (Max, Cinema4D, Terragen, Carrara...) and you can determine the position like in a global map (latitud&longitud).

Kram1032 · Post by **Kram1032** » Sat Aug 11, 2007 12:03 am

He asked for blender

Caronte · Post by **Caronte** » Sat Aug 11, 2007 12:16 am

Kram1032 wrote:He asked for blender

We only need some maths and a coder

Kram1032 · Post by **Kram1032** » Sat Aug 11, 2007 12:19 am

yes...
that's what I meant with the rest of my post...

you might find sort of a calculator, for that, or simmilar, dunno.
Or if you (or someone else) finds a formula, you can use that, yourself, then.

Caronte · Post by **Caronte** » Sat Aug 11, 2007 12:57 am

Making a quick search on google seems there is enough info to do it, but the coder is more dificult

filippo · Post by **filippo** » Sat Aug 11, 2007 2:46 am

only for max user ...you can see http://www.indigorenderer.com/joomla/fo ... php?t=1241
this tutorial it is write in italian, but the setting is very easy..
filippo

zsouthboy · Post by **zsouthboy** » Sat Aug 11, 2007 3:31 am

Maxwell actually made you do this information to set the sun position (last I used it - might be different now).

Personally, I *don't* see the value in it. Calculate it yourself, if needed.

Headroom · Post by **Headroom** » Sat Aug 11, 2007 4:20 am

I believe there is a script for Blender that helps you do that.
I remember that I read a post in respect to this on the Blender artists forum, so you may search the forum there for a solution.

For the Radiance lighting analysis software such a solution already exists and I think it is called "gensky". As radiance is open software a skilled programmer (which unfortunately excludes me

should be able to interpret that source code and replicate something similar for Blender or Indigo. That however really should not be part of Indigo as a render engine.

Headroom · Post by **Headroom** » Sat Aug 11, 2007 4:21 am

I forgot to add the link to the Radiance website:

http://radsite.lbl.gov/

crsrma · Post by **crsrma** » Sat Aug 11, 2007 5:17 am

Something like this has been in Lightwave, for god knows how long... It'd be sweet if it were part of Blender itself. I suggest making a feature request on the blender.org site.

neepneep · Post by **neepneep** » Sat Aug 11, 2007 6:07 am

http://www.stellarium.org/

Maybe Ono can copy and paste some of this into Indigo?

edit: I just noticed that they also have an API under development

hmmm?

REQ>Sun Position-Time of Day and Geographic Data

REQ>Sun Position-Time of Day and Geographic Data

Who is online