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Alpha Channel Scene

transparant background

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#1 The Q

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Posted 09 February 2018 - 04:45 PM

How do I  create a alpha channel for the background in V-Ray?

 

Thanks.

Q



#2 Andrew West

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Posted 10 February 2018 - 03:24 PM

 Vray Settings- Settings- Environment- Background-Color- use project color.  Make sure you check the Render Elements box to get all the channels you want.  It will add anything from Alpha to Reflections and Depth.  I separate out my channels for later composite.

A thing of note here:  The program gets its ambient light from the sky settings and if you have none since you are doing an alpha background you will have no ambient.  If you want to add ambient check the Environment Overides setting and click on GI (skylight).  Make it a sky and make the multiplier 3.  It will not show up in your render but the light will. 


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#3 cphfmz

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Posted 14 February 2018 - 09:09 AM

And how about other VBF channels such as Render ID and Material ID - is this possible?

 

Thanks.



#4 Justin Montoya

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Posted 14 February 2018 - 12:38 PM

To get the VFB channels you need to enable the Render Elements in the VRay Settings palette.  

 

Then once you render, you can export or even copy and paste each channel from the VFB to use in Photoshop.  You can also save ALL the available channels in a single layered EXR file for compositing in Photoshop.

 

I just did a quick text to confirm:

 

Attached File  PS-exr.JPG   69.63KB   1 downloads

 

More info on how to use the VFB  -

 

 


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#5 cphfmz

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Posted 16 February 2018 - 04:19 AM

Thanks very much, Justin. 

I have found it!



#6 timgarner_10

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Posted 20 February 2018 - 12:06 PM

   Glad I found this post, I've been trying to figure it out for a while now.

 

   Now does anyone know how to have a transparent floor for shadows / reflections in vray? For instance in FormZ I used to create a new renderzone material for a floor and under the "color" tab I'd select "background", then under "reflection" tab I'd select "catcher". In the "catcher options" you could then adjust the shadow intensity & if you want the floor to have any reflectivity. Then once rendered you could export image as a PNG and open it in Photoshop as an alpha channel but shill have shadows/ reflections on a transparent floor. The reason I'd like an alpha (transparent) background & floor is because we have custom backgrounds & pages with our company logo, page numbers, notes, etc. that have been created in Photoshop. So it's nice to just drop my .png rendered images into these pages and be able to scale / move them around & add my notes.






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