CG Society Lighting Challenges'

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  01 January 2010
Hey thanks guys for chiming in here.

Ian,
Hey appreciate your videos that you put together for the new lighting features. Thats one big list of valuable information on the EI site.
The textures I have created from scratch with Photoshop & NX shader mostly. I suppose the textures play a part in this but the lighting challenges focus more on achieving a particular feel/mood more than photorealism of textures. They normally set a theme like, " the Bedroom challenge was "Morning Glory", "Teen Angst" etc which becomes the focus of thinking. The idea is to start with a small amount of lighting and work toward a nicely lit scene. Some people manage to achieve it without GI or area lights etc. A bit like the winner of the Phoenix challenge we had here on this forum a little while ago.

I do have subsurface scatter on the grapes but I have reduced it to achieve the look I am after. After doing 7 of the lighting challenges my focus has shifted from photo-realism to nice contrasts and highlights in the attempt to create depth/mood and interest. I particularly like some of the images not because of their texturing but their execution of light like this one:-

http://www.3drender.com/challenges/...es/selim_54.htm

David,
Thanks for your comments. I like your smart lighting tools. I checked them out a couple of days ago and would really like to purchase them as most of my work is architectural stuff.
I do have a box around my scene which I bounce my photons off of. I guess after doing this I didn't like the evenly lit inter-object illumination rather looking more for nice fall off into areas of dimly lit parts and more shadow areas. I have used the "Customize Illumination" tools to do this which I think are excellent additions to the light control. They could be finessed a bit more but love the control they give for Bounced and Direct Illumination. This is the rendering that used this method of lighting which is my favourite which uses the Luminance Area Light Object:-

http://www.3drender.com/challenges/...s/floze_249.htm

Richard,
Hey excellent idea Richard. I'll do just that. How do you get your thumbnails to show on your post? I would really like to see this forum buzzing with productive conversation about our use of EIAS.

Buggsy
 
  01 January 2010
Originally Posted by buggsy: ...How do you get your thumbnails to show on your post? I would really like to see this forum buzzing with productive conversation about our use of EIAS...


Simply click the "Manage Attachments" button in the Additional Options below the Reply to Thread window. I think the file size should be less than 97.7k each (You can post many) You don't have to upload to your server and the thumbnail is automatic. The Attachment window will give you info if you goof... Kinda fool proof. (See why I can use it...)
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Rick
 
  01 January 2010
Fruit Bowl Area Lighting snapshot

Ok here goes. Hope I can get this to work. Making the file the right size (97.7 KB) was tough. Hope you can still read it!

My Fruit Bowl lighting setup. EIAS v8.0.

Buggsy
Attached Images
File Type: jpg Area-Lighting-setup.jpg (93.5 KB, 29 views)
 
  01 January 2010
Originally Posted by buggsy: Ok here goes. Hope I can get this to work. Making the file the right size (97.7 KB) was tough. Hope you can still read it!

My Fruit Bowl lighting setup. EIAS v8.0.

Buggsy


Hi Michael,
If you are new to EIAS photons, and need any help just post a request here.
I would be happy to point you in the right direction, or offer a few tips

Dave
 
  01 January 2010
Originally Posted by arketype: Hi Michael,
If you are new to EIAS photons, and need any help just post a request here.
I would be happy to point you in the right direction, or offer a few tips

Dave


Hey that would be good.

I think I get the gist of it but your comments on the screen shot of my area light setup would be great.

Buggsy
 
  01 January 2010
Its more than those settings, really.
Going step by step...

First you need to visualize your photon map and tweak the settings. The Map Mode should be set to "always visible" which means that Camera will render the actual photon map itself. "Baking" set to none and "Calculate" set to always.
During this photon map visualization, "Enable Global Illumination" must be DISABLED in the GI dialog box!

This will create a "blotchy" looking image.

By adjusting the lookup radii, and number of photons you can get even coverage of the photons, while optimizing for speed.

The next step is to use the "baking" feature to completely smooth out the photon map.
This effectively re-samples the photon map, further optimizing the scene for quality and speed.

Finally, you can change the settings back to "GI & Secondary", Baking On, and re-enable GI in the GI dialog for your final render.

Please post again with your progress. We are all very interested
Good luck!

Dave
 
  01 January 2010
Hey thats great Dave. That is the exact workflow I am using.

One of the cool things I think this new lighting system offers is that the photon map is used for secondary lighting (ray-traced reflections and transparencies) so no need to add a secondary light to the scene. Just use the photon map.

One of the other little new features (I'm sure it's new) is you can nominate a background colour which is great for when you want the blue sky to be in your reflections but you want control over adding scenery into your window via an alpha channel when in Photoshop.

Here are some screen shots for the Natural History challenge everyone and the link to the image for reference.

http://www.goodbuildingdesign.com.a...l_History_1.jpg

http://www.goodbuildingdesign.com.a...ory_Light_1.png
http://www.goodbuildingdesign.com.a...ory_Light_2.png
http://www.goodbuildingdesign.com.a...ory_Light_3.png
http://www.goodbuildingdesign.com.a...ory_Light_4.png
http://www.goodbuildingdesign.com.a...ory_Light_5.png
http://www.goodbuildingdesign.com.a...ory_Light_6.png

Buggsy
 
  01 January 2010
Originally Posted by buggsy: Hey thats great Dave. That is the exact workflow I am using.
Here are some screen shots for the Natural History challenge everyone and the link to the image for reference.


Nice Images Michael!
One other nice thing about the Photon Map is that blurry RT reflections are much faster.
This can add a good bit of realism to certain materials.


Dave
 
  01 January 2010
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