Set transparency of Arnold physical sky

[IchoTolot]

Hallo everyone,

Im currently using a Arnold physical sky shader in combination with an skydome light. It really adds the realism to the scene. I wanted to ask if ist possible to keep the light of the skydome/physical Sky, but make it transparent in the rendered image.

Thank you all very much

[mspeer]

Hi!

SkyDomeLight -> Visibility -> Camera

Please read the Arnold for Maya User Guide for more details about anything related to Arnold.

[IchoTolot]

Thank you, that already helped, but my background is still black, and not completely invisible.

[mspeer]

Hi!

??? What color should invisible have instead of black ???

[IchoTolot]

Excuse me. I may have misstated my problem. I wanted to have only my model,
and in the end render, there shouldnt be left a background, so no black, just nothing. Its something with the alpha channel. If I render an .tif image its black in the background, if an physical sky is applied

[mspeer]

Hi!

There can't be nothing, an RGB value is needed for the RGB Channel. You have to enable the alpha channel to see the "nothing" (Black in Alpha Channel) you are looking for.

Don't confuse Alpha (TIF) with Transparency (PNG).

You can check Alpha Channel (Black and White) in Arnold Render View and Maya Render View.

[IchoTolot]

Okay, you helped me alot understanding that. Is there a way to enable the alpha channel for the physical sky ?

[mspeer]

Hi!

You have to use the function from the application where you load the image and of course this image or video application needs to support alpha channels. Read more about alpha channels in the manual of your image application.

[IchoTolot]

okay, thank you. If Im rendering a tif, without skydome light, and physical sky, I get it without any background. Thats what confuses me. I wanted to achieve that with the physical sky

[mspeer]

Hi!

There should be no difference, please upload the scene-file and one of your rendered images.

[IchoTolot]

Im actually not able to upload .tif files, so i attached them, together with the scene file. One with physical sky, one without.

[mspeer · Accepted solution]

Hi!

1. If you check your render with Render View and switch to Alpha Channel you see everything is white, so there is a problem.

2. Visibility of Camera is set to "0", so that's fine.

3. In Render Settings: Arnold Render -> Environment - > Background, you made a connection to aiPhysicalSky.

So you have an "all overriding visible background".

Remove (Break) this Connection and the problem is gone.

[IchoTolot]

That worked and fixed my problem. Thank you very much for your time and help.

[cornerofart]

Thanks

[Anonymous]

Set transparency of Arnold physical sky?

I know I'm supposed to go to 

SkyDomeLight -> Visibility -> Camera

but I don't have a Visibility Tab

What do I do?

[Anonymous]

I know I'm supposed to go to 

SkyDomeLight -> Visibility -> Camera

but I don't have a Visibility Tab

What do I do?

[mspeer]

Hi!

This is only the transform node of the SkyDomeLight.

Go to  "aiSkyDomeLightShape1" there you find Visibility..

[Anonymous]

The Visibility option isn't there either. I have looked absolutely everywhere for it and cant find it. I'm not going crazy am I?

[mspeer]

Hi!

Open SkyDomeLight Attributes.

[Anonymous]

Set to 0 here
 

[Anonymous]

Set to 0 here