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Old 08-26-2006, 12:59 PM   #1
Martin Kay
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Lighting problem or not?

I'm experimenting with the EI lights to see what I can do with them. At the link below is a small test scene with a 3 light set up, 1 key, 1 fill and a backlight. The back light is causing a very hard edged shading phenomena in one part of the scene. Is this what you get, or can I do something about it? It happens with both spots and omni type lights.

http://www.martinkay-3d.com/EI_pages/3lights.html

Cheers Martin K
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Old 08-26-2006, 02:16 PM   #2
AzOne
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Does playing with the object texture diffuse or specular falloff cause any change?
Is there a dropoff setting for the lights?
 
Old 08-26-2006, 04:04 PM   #3
Igors
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Quote:
Originally Posted by Martin Kay
I'm experimenting with the EI lights to see what I can do with them. At the link below is a small test scene with a 3 light set up, 1 key, 1 fill and a backlight. The back light is causing a very hard edged shading phenomena in one part of the scene. Is this what you get, or can I do something about it? It happens with both spots and omni type lights.

http://www.martinkay-3d.com/EI_pages/3lights.html

It looks like UV seam
 
Old 08-26-2006, 09:12 PM   #4
evant
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Evan Troxel
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try changing the Factor setting in the light properties to .7
 
Old 08-27-2006, 07:17 AM   #5
Martin Kay
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I did try adjusting settings, but its a lighting quirk.

Martin K
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Old 08-27-2006, 08:19 AM   #6
Igors
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Hi, Martin
Quote:
Originally Posted by Martin Kay
I did try adjusting settings, but its a lighting quirk.
Never seen such lighting quirks . Minimize your prj, atchive and upload it, we'll try to help
 
Old 08-27-2006, 09:10 AM   #7
BJMonkey
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Actually... EIAS lights have always done that... They don't seem to roll round the sides of teh shape no matter what.

The things you can do?
Add shadow transmission, (or SSS)
Or Add GI and you won't notice it so much.

This happens in the real world, but with infinate light bounces all the time, we don't notice it
 
Old 08-27-2006, 11:14 AM   #8
Martin Kay
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Quote:
Originally Posted by Igors
Hi, MartinNever seen such lighting quirks . Minimize your prj, atchive and upload it, we'll try to help


Actually it happens also in c4d, after you add a shader. I tried it earlier to see...
I'll have a go at uploading the project later.
Cheers

Martin K
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Old 08-27-2006, 11:37 AM   #9
Martin Kay
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Quote:
Originally Posted by Igors
Hi, MartinNever seen such lighting quirks . Minimize your prj, atchive and upload it, we'll try to help


Here you go. Thanks for looking at it!

Martin K
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Old 08-27-2006, 12:29 PM   #10
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Quote:
Originally Posted by Martin Kay
Here you go.
Nope yet, there is no fact file in your archive
 
Old 08-27-2006, 01:09 PM   #11
Martin Kay
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Quote:
Originally Posted by Igors
Nope yet, there is no fact file in your archive


I've downloaded it back to me twice and it's fine. Isn't technology wonderful....

Martin K

Using this forum is sometimes more complicated than form Z...
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Last edited by Martin Kay : 08-27-2006 at 01:24 PM.
 
Old 08-27-2006, 02:48 PM   #12
Igors
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Quote:
Originally Posted by Martin Kay
I've downloaded it back to me twice and it's fine. Isn't technology wonderful....
Still no FACT there Use "collect files" from File menu and then archive created folder, it's easy way to send prj. This time please don't worry, your problem is visible well just with a simple cylinder.

There is no any "criminal" and, yes, you'll have same/similar effect in any 3d app. Your back light intensity = 1.3 and it creates visually tight transition from light to dark. The simplest fix is to replace back light with 2 lights with intensities 0.65 that have a little different positions (radial sources) or directions (parallel sources)

Quote:
Originally Posted by BJMonkey
Actually... EIAS lights have always done that... They don't seem to roll round the sides of teh shape no matter what.
Light with soft shadow should illuminate some points even their normals are opposite to light direction. But it does not
 
Old 08-27-2006, 09:48 PM   #13
Martin Kay
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Quote:
Originally Posted by Igors
Still no FACT there Use "collect files" from File menu and then archive created folder, it's easy way to send prj. This time please don't worry, your problem is visible well just with a simple cylinder.

There is no any "criminal" and, yes, you'll have same/similar effect in any 3d app. Your back light intensity = 1.3 and it creates visually tight transition from light to dark. The simplest fix is to replace back light with 2 lights with intensities 0.65 that have a little different positions (radial sources) or directions (parallel sources)

Light with soft shadow should illuminate some points even their normals are opposite to light direction. But it does not


Thanks Igors! I'll try that, and thanks for the info about 'collect files'

Martin K
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Old 08-28-2006, 06:28 AM   #14
Martin Kay
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Quote:
Originally Posted by Martin Kay
Thanks Igors! I'll try that, and thanks for the info about 'collect files'

Martin K


Using two lights, radial or parallel, just gives two hard lines. Oh well have to live with it.

Martin K
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Old 08-28-2006, 08:17 AM   #15
Martin Kay
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Quote:
Originally Posted by Martin Kay
Using two lights, radial or parallel, just gives two hard lines. Oh well have to live with it.

Martin K


I think the problem is the third light. I'm quite happy with what I'm getting with a two light setup. I suppose you'd normally only have one key and one major fill in most situations, but with interiors lighting can obviously get more complex.

Martin K
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