Does the color of sunlight change during the day?

RyanSpaulding · May 18th, 2005

Hey guys,

I remember a while back hearing that the color of the sunlight changes throughout the day. Does anyone have any info on this? I'm looking for accuracy on some renders and this would help. Thanks in advance.

Adehus · May 18th, 2005

These links might help some:

http://www.cybercollege.com/tvp028.htm
http://members.shaw.ca/jimht03/light.html
http://www.lightenergysource.com/kelvintemp.htm
http://www.insaneness.com/cgi-bin/kwrgb.cgi

Andrew Schroeder · May 18th, 2005

Nice links, those are gonna come in handy.

To summarize them, yes, the apparent color of sunlight changes during the day due to atmospheric conditions in your particular location on the globe. Noon in Toronto, isn't the same as noon in Victoria.

What might be interesting is if anyone here has techniques for measuring or matching these physical colour changes for use in their CG imagery.

Adehus · May 18th, 2005

Andrew-

I don't have any specific resources for that, but I think that the Maxwell renderer is interesting to watch from that perspective- I believe they're claiming that their app will account for all of the variables related to location, and will also allow for adjustment of turbidity, ozone, etc.

Ernest Burden · May 18th, 2005

Ask Claude Monet about his Rouen Cathedral series

Check out the little animated bits on this page:
http://acg.media.mit.edu/people/gola...en_Images.html

and here:
http://www.mcah.columbia.edu/monet/swf/

Tim Nelson · May 18th, 2005

Quote:

Originally Posted by Ernest Burden

Ask Claude Monet about his Rouen Cathedral series

I saw at least a couple of those at the Monet exhibit in Vegas last year, and I was so amazed at his work. I think it was probably the best exhibit I had ever been to because it focused on him alone and I really learned a lot about him & his work, and was especially impressed with his obsession with lighting.

I wonder how his work would be different if he lived in our time.

IC · May 19th, 2005

The difference is he wouldn't be hung up about when it happened-just that it did and that he might be able to recreate it.

Surely the easiest way is to take photos and try to match the lighting you want/like by eye.
There are too many variables to try and calculate something like this. Maxwell works through maths not nature.

silviapalara · May 23rd, 2005

One tutorial I always keep handy is at

http://www.warpedspace.org/lightingT/part1.htm

But most definately try to take photos on location at the same time of day of your project, and if you are lucky, at the same time of the year. What I also do is in Photoshop to pick by eyedropper the color in the darkest and the lightest spot in my photos and keep those colors and values as references for my projects.

vizwhiz · May 23rd, 2005

hi There

Silvia

Thanks for the excellent link on Lighting

at the very bottom of This page There is yet another link to some more Lighting Info

it says:

I highly recommend THIS tutorial for a more in-depth look at lighting (by Richard Harris)

http://www.itchy-animation.co.uk/light.htm

quite Interesting, very useful

Thanks again

Randy

Adehus · May 23rd, 2005

Great links Silvia and Vizwhiz- thanks for sharing!

Andy

May 18th, 2005	#1 (permalink)
RyanSpaulding Veteran Member Join Date: Jul 2004 Location: Madison, WI Age: 27 Posts: 950 Name: Ryan Spaulding	Does the color of sunlight change during the day? Hey guys, I remember a while back hearing that the color of the sunlight changes throughout the day. Does anyone have any info on this? I'm looking for accuracy on some renders and this would help. Thanks in advance.

May 18th, 2005	#2 (permalink)
Adehus Senior Member Join Date: Mar 2005 Location: USA Posts: 454 Name: Andrew Dehus	Re: Does the color of sunlight change during the day? These links might help some: http://www.cybercollege.com/tvp028.htm http://members.shaw.ca/jimht03/light.html http://www.lightenergysource.com/kelvintemp.htm http://www.insaneness.com/cgi-bin/kwrgb.cgi

May 18th, 2005	#3 (permalink)
Andrew Schroeder Member Join Date: Apr 2005 Location: Vancouver, BC Posts: 54 Name: Andrew Schroeder	Re: Does the color of sunlight change during the day? Nice links, those are gonna come in handy. To summarize them, yes, the apparent color of sunlight changes during the day due to atmospheric conditions in your particular location on the globe. Noon in Toronto, isn't the same as noon in Victoria. What might be interesting is if anyone here has techniques for measuring or matching these physical colour changes for use in their CG imagery.

May 18th, 2005	#4 (permalink)
Adehus Senior Member Join Date: Mar 2005 Location: USA Posts: 454 Name: Andrew Dehus	Re: Does the color of sunlight change during the day? Andrew- I don't have any specific resources for that, but I think that the Maxwell renderer is interesting to watch from that perspective- I believe they're claiming that their app will account for all of the variables related to location, and will also allow for adjustment of turbidity, ozone, etc.

May 18th, 2005	#5 (permalink)
Ernest Burden Veteran Member Join Date: Apr 2002 Location: Ossining, NY USA Posts: 4,999 Name: Ernest Burden III	Re: Does the color of sunlight change during the day? Ask Claude Monet about his Rouen Cathedral series Check out the little animated bits on this page: http://acg.media.mit.edu/people/gola...en_Images.html and here: http://www.mcah.columbia.edu/monet/swf/ __________________ Ernest Burden III AcmeDigital architectural rendering

May 19th, 2005	#7 (permalink)
IC Veteran Member Join Date: Apr 2003 Location: Edinburgh, Scotland Age: 36 Posts: 2,261 Name: Iain Collins	Re: Does the color of sunlight change during the day? The difference is he wouldn't be hung up about when it happened-just that it did and that he might be able to recreate it. Surely the easiest way is to take photos and try to match the lighting you want/like by eye. There are too many variables to try and calculate something like this. Maxwell works through maths not nature. __________________ http://iainc.carbonmade.com/

May 23rd, 2005	#8 (permalink)
silviapalara Member Join Date: May 2005 Location: SF Bay Age: 35 Posts: 51 Name: Silvia Palara	Re: Does the color of sunlight change during the day? One tutorial I always keep handy is at http://www.warpedspace.org/lightingT/part1.htm But most definately try to take photos on location at the same time of day of your project, and if you are lucky, at the same time of the year. What I also do is in Photoshop to pick by eyedropper the color in the darkest and the lightest spot in my photos and keep those colors and values as references for my projects.

May 23rd, 2005	#9 (permalink)
vizwhiz Veteran Member Join Date: Sep 2002 Location: arizona usa, earth/universe Age: 56 Posts: 1,009 Name: Randy Sanders	Re: Does the color of sunlight change during the day? hi There Silvia Thanks for the excellent link on Lighting at the very bottom of This page There is yet another link to some more Lighting Info it says: I highly recommend THIS tutorial for a more in-depth look at lighting (by Richard Harris) http://www.itchy-animation.co.uk/light.htm quite Interesting, very useful Thanks again Randy

May 23rd, 2005	#10 (permalink)
Adehus Senior Member Join Date: Mar 2005 Location: USA Posts: 454 Name: Andrew Dehus	Re: Does the color of sunlight change during the day? Great links Silvia and Vizwhiz- thanks for sharing! Andy

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
change to mac!	dresmoshur	Hardware and Technical Discusions	9	February 19th, 2004 04:54 AM
change to 8 bit 256 colour but it not show display anything on monotior	UTGolf	Lightscape	0	August 4th, 2003 05:23 AM
Sunlight system in Max 5 :(	mzagorski	3ds Max	9	May 6th, 2003 10:16 PM
sunlight problems	dim	Autodesk VIZ	1	January 14th, 2003 02:53 PM
Interior - Photometric & Sunlight Radiosity	Eric	Autodesk VIZ	8	November 8th, 2002 05:28 AM