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Poser - OFFICIAL F.A.Q (Last Updated: 2025 Feb 02 10:01 am)



Subject: Poser 9 Firefly render with HDRI and AO - what's causing the 'banding'


3dcheapskate ( ) posted Mon, 25 August 2014 at 11:08 AM · edited Sun, 02 February 2025 at 1:54 PM

file_506863.jpg

Partial render attached. What's causing the horizontal banding?

Scene contains two lights with intensities cranked up high:

  • Diffuse IBL, 180% intensity, IBLcontrast 0.5, using the free sIBL 'Topanga Forest' HDR image (converted from lat/long to angular(light-probe) in HDRShop), no shadows, AO enabled (strength 1.0)

  • Infinite light, 200% intensity, depth mapped shadows, AO enabled (strength 1.0)

Scene AO settings: max dist 1.0, bias 0.0002, samples 3, evaluate in light UNchecked

(My units are Poser Units)


The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).



3dcheapskate ( ) posted Mon, 25 August 2014 at 11:13 AM

file_506864.jpg

Render settings


The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).



3dcheapskate ( ) posted Mon, 25 August 2014 at 11:17 AM

file_506865.jpg

IBL/AO settings


The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).



3dcheapskate ( ) posted Mon, 25 August 2014 at 11:20 AM · edited Mon, 25 August 2014 at 11:23 AM

The dragons skin has no texture or shader network applied, and the banding still appears (just above its left foreleg, so I assume it's nothing to do with the textures.

I'm 99% certain it's something to do with my AO settings. I often get weird shadowing along mesh lines (which usually indicates that I need to increase the AO bias), but I've never seen anything like this before.


The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).



DarwinsMishap ( ) posted Mon, 25 August 2014 at 11:39 AM

I rarely use AO, since P10 doesn't need it- unless it's in a seperate rendering pass.  I'm fairly certain as well it's the settings...

Why are your lights set so high, might I ask?


kalrua ( ) posted Mon, 25 August 2014 at 11:48 AM

Irradiance catching 32

 

Irradiace catching 100

 

 

 

Irradiace catching 100

Ao Sample 9


3dcheapskate ( ) posted Mon, 25 August 2014 at 8:56 PM · edited Mon, 25 August 2014 at 8:57 PM

Quote - I rarely use AO, since P10 doesn't need it- unless it's in a seperate rendering pass.  I'm fairly certain as well it's the settings... Why are your lights set so high, might I ask?

The 180% for the IBL is based on this http://poser.smithmicro.com/tutorials/poser_IBL.html (I don't use HDR that much, so 180% intensity + 0.5 contrast seems a good start). The infinite was originally at 50%, but this was far too low compared to the IBL intensity, so I wound it up to 75%, 100%, 150% and ended up at 200%. I'll try dialling down

 

kalrua: That could be it - the effect in the first image looks sort-of similar, with distinct horizontal lines. I'll try increasing the irradiance catching.

 

(Alternative option: try using IDL instead of the diffuse IBL...)


The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).



3dcheapskate ( ) posted Mon, 25 August 2014 at 9:20 PM · edited Mon, 25 August 2014 at 9:21 PM

file_506873.jpg

Yep, increasing irradiance catching from 32 to 100 completely got rid of the banding (I only re-rendered two small rectangles to check - see the attached image ).

Many thanks.


The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).



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