[FEATURE REQUEST] Alpha rendering for cinematics

[catalejo]

I just did a project where i had to render in matinee a lot of stuff
I believe if UE4 wants to become part of the film/TV pipeline, it needs to be able to render alpha channels.
One suggestion (maybe for the upcoming sequencer) is to develop a material, or a material function, that when rendered, it works as an alpha channel or at least a matte. so it is possible to composite masked elements on other software like after effects, nuke, etc. It would be nice if this material supports transparency/level of opacity, so it is easy to tweak.

This it is very much needed if UE4 wants to be a player on the TV/Film industry

Thanks!

[reedandrader]

This would be huge.

Right now I have to resort to a hacky in engine green screen by putting a key color on a plane and keying it out in post. It's not the most clean/efficient.

Render Custom Depth is already working for screenshots. Let's make it work with matinee.

[darthviper107]

Really what it needs is the option to render EXR for animations

[Lovecraft_K]

Hi -

I have entered a feature request, UE-15984 for reference, to add tHE ability to render a video out from matinee with an Alpha Channel (Matted and/or Unmatted).

Thank You

[reedandrader]

Hi -

I have entered a feature request, UE-15984 for reference, to add tHE ability to render a video out from matinee with an Alpha Channel (Matted and/or Unmatted).

Thank You

Fantastic News! Thanks Eric.

[PaulMiller]

This is great news.

But can I also ask that the output is antialiased? I did hack the masking feature from HighResScreenshot to happen during Matinee output, but I find the the result is not antialiased -presumably masking happens later in the PostProcessing graph?

[blented]

+100 for this, it would be soooo useful!

[WACOMalt]

I am in dire need of an alpha output. I just got done assigning "matte" materials to my whole world (Solid black or white materials, and custom ones for anything using masked or translucent), JUST for one render pass!
Is there any update on the feature request? Where can I go to look at the status of the request, or to add my "Me too!" to it?

Really, making matinee just use HighResScreenshot (with option to output buffers) is all that is needed to really make Unreal fit into a VFX pipeline. They're really omitting a large user-base there.

[Tim Hobson]

This request was actually closed as "Won't fix." This is due to Sequencer being developed as a replacement of Matinee.

https://trello.com/c/id01TVGq/495-sequencer

There isn't really any more information to offer than this at the moment. Keep an eye for any future updates in our Release notes for Major version releases.

[MagicNono]

Hi,
Some times ago I was asking about a similar thing, about to output an ARGB output (https://forums.unrealengine.com/show...o-SDI-with-key).

It would be great if this case was actually engineered at the same time than the ability to output an Alpha Channel from the Sequencer.

With the sequencer out now do this output Alpha ?

Cheers

[Slavq]

A nice, big +1 from me

[Mark Galavan]

I have just started considering using Unreal Engine 4 for doing high resolution rendering
(instead the ancient Mental Ray environment in Maya). But I am overwhelmed already
by the fact that the UE doesn't seem to allow for any alpha channel output: even 1 frame!
Seriously? I don't understand; what a hassle to composite.

[zeOrb]

I have just started considering using Unreal Engine 4 for doing high resolution rendering
(instead the ancient Mental Ray environment in Maya). But I am overwhelmed already
by the fact that the UE doesn't seem to allow for any alpha channel output: even 1 frame!
Seriously? I don't understand; what a hassle to composite.

It's coming in 4.13

[Mark Galavan]

It's coming in 4.13

Thanks for the update!

[je.fish]

It's coming in 4.13

I've just started to play around with sequencer export in 4.13.1 and noticed it didn't render out an alpha which lead me to this thread. i wondered if i have to activate rendering the alpha somewhere or is the feature still missing?