Hi everyone.  I have had this issue for a LONG (years) time and I always got rid of it in Photoshop, but I am finally at the point where I actually want to learn what is causing it.  This issue happens with any light that is designated IBL and has AO turned on.  I like AO for the effect it has, so I really don't want to solve the issue by turning it off.  

I set render to Final, set raytrace to 3 (usually have something reflecting or transparent in scene), pixel samples to 6, and min shading to 0.20. I also use smoothing and displacement.  I am fairly sure someone here knows what this is right off the top of their head.  I have a Help Desk ticket in with SM, but it has been 11 days and still no answer.

Thank you in advance.

I remember seeing that. Which Poser version do you use?

Quote - I remember seeing that. Which Poser version do you use?

I currently use Poser Pro 2012 with the latest SR.

 

Oh, and I would like to apologize for the thread name.  I fat fingered that and it should read "IBL", not "IDL".

As far as I remember, PP2012 can do real idl? Ibl ao is sort of a cheat and has som issues. Have you tried with real idl and wheter that makes the stripe go away? I have a little voice in my head insisting on something like shadow bias, being the cause of thisbut I'm not sure it's right.

Well, through all my troubleshooting, simply turning off AO on the IBL light gets rid of the issue, but that also leaves me without the deep shadow effect I like to have with these renders.  I just got a reply back from SM saying,  basically, they don't know either and have forwarded the issue to a Project Team. 

I will check the shadow bias when I get home though.  Thanks!

Quote - Well, through all my troubleshooting, simply turning off AO on the IBL light gets rid of the issue, but that also leaves me without the deep shadow effect I like to have with these renders.  I just got a reply back from SM saying,  basically, they don't know either and have forwarded the issue to a Project Team. 

I will check the shadow bias when I get home though.  Thanks!

Yes, the width of the white line is the AO-bias you get for intersecting objects. Lower it to make the white line thinner. You can even assign negative values, but too small values will make the edges of your mesh shine through. You can set the bias value in "Scene AO Options" in the properties panel of the light.

Quote - > Quote - Well, through all my troubleshooting, simply turning off AO on the IBL light gets rid of the issue, but that also leaves me without the deep shadow effect I like to have with these renders.  I just got a reply back from SM saying,  basically, they don't know either and have forwarded the issue to a Project Team. 

I will check the shadow bias when I get home though.  Thanks!

Yes, the width of the white line is the AO-bias you get for intersecting objects. Lower it to make the white line thinner. You can even assign negative values, but too small values will make the edges of your mesh shine through. You can set the bias value in "Scene AO Options" in the properties panel of the light.

Thank you!!  I will try that tonight and post the results.

Well, I set the bias down to 0.0004 from 0.0009.  It did the trick, but it feels like I turned off AO.  The shadow is really no longer visible.  No worries though.  I felt that it might be a limitation of the Firefly renderer.

You do have PP2012.  Why not use IDL settings without AO.

Quote - You do have PP2012.  Why not use IDL settings without AO.

 

See original post ;)

Point taken, however have you tried IDL rendering instead of IBL for ambient lighting to see if the same problem occurs.

Quote - Point taken, however have you tried IDL rendering instead of IBL for ambient lighting to see if the same problem occurs.

Yes I have.  The line only appears with IBL and AO.  Every other lighting scheme does not show a line.  If I turn down the AO Scene bias to 0.0004 the line goes away, but so does most of the shadow that I want to retain.  When I render it in Lux through Reality, there is no problem and there is no problem with Firefly's IDL.