topic Re: Cinerender alpha channel in front of transparant surface in Documentation

Cinerender alpha channel in front of transparant surface

Erwin Edel — Wed, 20 Jul 2022 13:36:20 GMT

Does anyone know if there is a fix for this issue?

I've gone over a lot of settings, but can't seem to find one that fixes it.

If I have images with an alpha channel, they render just fine in front of surfaces without transparancy, but in front of glass they get white edges/borders.

It's not the end of the world, but I would like to get rid of it, if possible.

Re: Cinerender alpha channel in front of transparant surface

DGSketcher — Fri, 22 Jul 2022 09:08:52 GMT

@Erwin Edel the white on the glass looks to be more of an attempt at reflection rather than white borders. Perhaps a new glass with a lower reflectance value might improve the image?

Re: Cinerender alpha channel in front of transparant surface

Erwin Edel — Mon, 25 Jul 2022 06:33:27 GMT

I've tried all the different 'normal' glass surfaces from the catalogue and different type of alpha channel transparancy images. They all give a similar result.

Re: Cinerender alpha channel in front of transparant surface

Erwin Edel — Wed, 27 Jul 2022 07:11:22 GMT

Small update. It does seem to be issue where the surface behind the glass is rendered without shadows, reflection etc

A few quick tests I did:

no walls behind the glass, no problem

a white wall with ceiling for shadow, you get the white spots again

I made the wall blue, now the spots are blue

Re: Cinerender alpha channel in front of transparant surface

DGSketcher — Wed, 27 Jul 2022 07:39:41 GMT

Random suggestion of the day: I assume you are just using sunlight, what happens if you add a general light within the room still with the sunlight?

Re: Cinerender alpha channel in front of transparant surface

Erwin Edel — Wed, 27 Jul 2022 07:53:01 GMT

With some generic interior light and sun:

Without sun and only that generic light:

So sunlight does seem part of the problem.