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render movie with transparent background


I am looking to render an animation but I do not want to render the background, only the mesh. Is there a way of doing this?

similar as to when you save something in photoshop as a PNG. file you can have no background colour.

I know you can save renders as png image sequence but have tried this. it doesn't work.

I also cannot just remove the background colour in photoshop after because there are emissive materials so the black background can not be totally removed. Also I will need it removed from every frame...

Please see the images to get a better idea of my problem. alt text alt text

Product Version: UE 4.17
18.png (402.8 kB)
19.png (442.9 kB)
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asked Sep 18 '17 at 09:29 PM in Rendering

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You could split the image into its individual render passes and use a tool like Nuke or After Effects to composite them after you're done rendering.

UE4 Renderpass Documentation

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answered Sep 19 '17 at 07:30 AM

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avatar image Ryan_architect Sep 19 '17 at 10:13 PM

Are there any ways to render a mesh and material without a background in UE4? I do not want to have to use other software if i dont have to.

avatar image Schnittbrot Sep 20 '17 at 07:36 AM

There's this one guy trying chroma keying in UE4 using media textures, but you'd still have the same problem concerning your emissive materials.

Rendering this with Sequencer and combining your passes afterwards is your best shot I fear.

I've done some searching and rendering with an embedded Alpha channel still is an unsupported feature.

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