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andrewbirch

Alpha Channel Backgrounds

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Hi Folks, any chance that renderworks backgrounds can render out an alpha channel with the render ? i.e. instead of choosing a typical background option, I choose the entire background to be a black alpha.

I asked about this years ago, and it would be extremely useful.

Edited by andrewbirch

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No way to do it in VW. Not that I know of. If you have Cinema4D you can bring it in and easily do that. Who knows, maybe in September ...

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Yes,

Render a Viewport without a Background and

give it a None Fill.

You can either Underlay other imagery/geometry or copy & paste directly into Photoshop.

ubbthreads.php?ubb=download&Number=9322&filename=2%20Viewports%20with%20None%20Fill.png

ubbthreads.php?ubb=download&Number=9323&filename=Into%20PS.png

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Interesting. I had no idea you could do that. I'll have to give it a try. Do you have to copy/paste or can you export as png or tiff?

Although technically it's a transparent background, not an alpha channel. But if it works it's just as good (I actually prefer transparent backgrounds over true alpha channels).

Edited by Monadnoc

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When using this method, I suggest turing off anti-aliasing in the render options. Giving a viewport no fill via the Attribute palette simply makes any pure white areas transparent. This means aniti-aliasing (that blends the edges of the model with the white background) will cause a halo effect around the model. Also, keep in mind that ALL pure white areas become transparent. This means any parts of the model that render white will turn transparent.

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