Noise behind transparency mapped surfaces

[Micha]

Hi,

I placed an offset surface for a transparency mapped text texture and now I get a strong noise behind the transparent area. Can I avoid this? Is it a bug?

-Micha

[Micha]

Also it looks like there a sampling problem behind semi transparent areas without textures.

[Peter.Chaushev]

I cannot determine the cause based on the provided illustrations. Could you please share a stripped-down version of this scene for inspection?
If this is alright, please use a file-sharing service of your choice to send it over to support@chaosgroup.com (forum post link included).

Kind regards,
Peter

[Micha]

Thank you, I will send an email. Side note - I found now it's in CPU mode only.

[Micha]

I have slow email contact and here a quote from my last email:

"Particular I found a reason for the issue. It's a problem of VfR2 materials too. If I create fresh materials, it works better, the area behind the front glass is clean now, but two problems stay:

(a) there transparent area of the logo shows some strange sampling effects during the calculation, it seams to be the transparent area isn't fully clipped. It's visible during the IM calculation and if switched to BF there too (but not so strong).

(b) the transparent area of the logo isn't denoised, since it will be handled like refraction, but the refraction layer and the option "all channels" are not enabled and used for the material


The issue (b) can be focus to the question: if the user is using a material with a diffuse layer only and transparency mapping, how should he enable "all channel"? Also if transparent areas would be fully clipped and invisible, the problem will come back if the user use half transparent setups. I suppose so the problem is that transparent areas will be handled like refraction. My impression: at VfR2 transparency was not handled as refraction."

I'm very curious for a solution.

-Micha