Forum: Poser - OFFICIAL


Subject: How Do I Get Rid Of Undesirable Light Artifact ?

mathman opened this issue on Jun 25, 2008 · 10 posts


mathman posted Wed, 25 June 2008 at 9:03 AM

Hi all,

In the attached picture, you can see the problem in the subject's lower eyelids, and also (to a lesser extent) his lower lip.

I've tried a few lighting combinations but cannot get rid of it.

Any help appreciated.

Thanks,
Andrew


vincebagna posted Wed, 25 June 2008 at 9:22 AM

AO would get rid of those :)

My Store



Miss Nancy posted Wed, 25 June 2008 at 11:39 AM

there are a number of threads here on how to eliminate nostril glow,
from poser 4 thru the current version.



stewer posted Wed, 25 June 2008 at 12:03 PM

It looks to me like you don't have shadows turned on? 


bagginsbill posted Wed, 25 June 2008 at 5:17 PM

If you already have shadows on, then you may need to decrease your shadow min bias. You may also need to increase your shadow map size (for depth-mapped shadows). Do not use 256 - ever. Go to 1024 at least.

Raytraced shadows are the best of all. However, they don't behave well with displaced surfaces so sometimes you have to use depth-mapped.


Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)


mathman posted Wed, 25 June 2008 at 7:05 PM

bagginsbill,

When you say "shadows on", are you referring to the checkbox in the Render settings which says "Cast shadows" ?

thanks,
Andrew


bagginsbill posted Wed, 25 June 2008 at 7:35 PM

Yes and also on the light. They both have to be on.

If you're using raytraced shadows, you also have to enable raytracing.


Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)


mathman posted Thu, 26 June 2008 at 4:44 PM

Bagginsbill,

If you have a large number of lights, do you have to check that each one has shadows turned on ? ... is there a quicker way, e.g. do you know of a python script ?

thanks,
Andrew


bagginsbill posted Thu, 26 June 2008 at 4:55 PM

Uhoh. You have a large number of lights? Hmm.

A Python script could be built to automate that. However, the bigger question is, why do you have a large number of lights?!?

Which Poser are you using? In particular, are you using a large number of lights because you're in Poser 5 and do not have IBL?

Faking ambience with a large number lights is just not the way to go with Poser 6 and up. You should be using IBL.

Many Poser 5 light sets were created with a ton of lights and no shadows on most of them, because making 20 or 30 good-quality shadow maps would take a loooong time. Light sets like that will always produce those glowing surfaces.

If you're using Poser 6 or better, you really only need two lights for basic even lighting of a single figure. Sometimes you use one more as a rim light (from behind). You never need more than 4 to do a portrait.

After you come back and tell me which Poser you have, we can talk about what to do. If you have Poser 6 or better, I'll show you how to use IBL and one or two directional lights for good portrait lighting.


Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)


mathman posted Thu, 26 June 2008 at 7:19 PM

Bagginsbill,

I have P7 SR2.1. The "large number of lights" was a hypothetical scenario, seeing as I have a lot of light sets with a ton of lights. Maybe I should throw them out ?!

Unfortunately, I have forgotten which light set I was using to produce the image in my first posting in this thread.

Just need to get rid of those glowing artifacts, and produce a truly realistic render - traditionally it has been nostril or inner mouth glow, but in my case I have been getting glowing lower lip, lower eyelids and tear ducts.

Thanks again.

regards,
Andrew