How can I render a COP as background of camera?

[Masoud]

Hello;

I would like to render a COP as background color of my camera. I set:

op:/img/comp1/Gradient_OUT

in my camera background image tab, but it doesn't works.

Any idea?

 

Thanks.

Edited November 4, 2019 by Masoud

[evanrudefx]

hmm works fine for me. Have tried making sure display background is turned on/does it work with a normal file?

[Masoud]

  On 11/4/2019 at 6:38 PM, ejr32123 said:

hmm works fine for me. Have tried making sure display background is turned on/does it work with a normal file?

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But it is just in view-port, not in render!

[LucaScheller]

If you're using mantra you can add the same expression in the background display options of the renderview. You can open these by pressing the "d" key in the render view. For other render engines it depends on the support of COP networks and the COP syntax. 

Edited November 7, 2019 by LucaScheller

[Masoud]

Thanks LucaScheller;

But when I render it, this background is not included in rendered image

Edited November 10, 2019 by Masoud

[Masoud]

Is it possible?

[evanrudefx]

I am not sure why it doesnt work when you load from cop. It does work when you load from a file. You could just save out the cop to file then load it as back ground image.

[Masoud]

  On 11/11/2019 at 3:42 PM, ejr32123 said:

I am not sure why it doesnt work when you load from cop. It does work when you load from a file. You could just save out the cop to file then load it as back ground image.

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Hmmm, not good idea.

[evanrudefx]

why? Also, why not just add it in post? I wonder if the cop not rendering is a bug

Edited November 12, 2019 by ejr32123

[Masoud]

  On 11/12/2019 at 4:02 PM, ejr32123 said:

why? Also, why not just add it in post? I wonder if the cop not rendering is a bug

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In final step, I'll use post to composite background, but when I need to test my scene, I would like to see the background in Houdini renders.