Question Recorder Image Alpha under HDRP

Hi,

I have another question regarding capturing an image with transparent background under HDRP.

- I have setup the HDRP Asset to use R16G16B16A16 as color buffer, and my post processing also use R16G16B16A16 for LUT Grading.

- I have setup Lighting setting to use a Gradient Sky for Ambient color (aka Static Lighting Sky), but for the actual Skybox, we override it with Visual Environment set to Type: None and Ambient Mode: Static.

- Then I set the Camera to use either Background Type: Sky or Color, and set the Background Color to (0, 0, 0, 0).

- I see the background is now grey in scene view (as in skybox is transparent), and black in game view.

- In Recorder I have use PNG as Media File Format.

However my capture still has a black background, eg. (0, 0, 0, 1)

Is there anything else we need to check? We could really use some documentation here, because I can never got "Include Alpha" to show up, whichever Source I select.

https://docs.unity3d.com/Packages/com.unity.recorder@2.5/manual/RecorderImage.html

 

This option "include alpha" never happens in my recorder clip (Timeline) or in the Recorder window (withotu Timeline).

How do you access this option please? We need to export our characters on transparent backgrounds...

 

Hi, I'm using HDRP and I also have the same problem that the Include Alpha toggle doesn't appear in my recorder as shown in the picture below, please help me fix this, thanks!

 

Updating to the 3.0.1 version fixed my problem.

 

Thanks for your help, sir. I checked the Enable Pre-release Packages toggle in Project Settings, but there's still only the 2.5.5 version showed up. How can I update to the 3.0.1 version?

 

You need to add it manually. I also don't get it because before we could see preview package along with stable ones.





I went on this page to see available versions : https://docs.unity3d.com/Manual/com.unity.recorder.html



Hope it will fix your issue as it did for me!

 

Thanks!!!!

 

So there's no way to capture alpha using UniversalRenderPipeline? any updates?

 

A link to a thread where I explain how I made it work under URP (2021.2.1)

LINK

 

If anyone encounters the problem of not recording alpha channel in HDRP, don't worry about it. You need to modify color buffer format to R16G16B16A16 format in HDRP render pipeline asset.

PS. I strongly recommend this point should be written in Unity Recorder pulgin's documention. Otherwise, users may suffer the issue that the exported pngs have no alpha channel.