z_depth Render Element Problem

[Komposer]

Hi,
I´ve a strange z_depth prob and don´t know if I make a mistake here in setup the RE!?
The scene has some objects, You see it in the channel, and the rest is empty (means black in beauty pass).

When I try to use that image in nuke, there happens strange ugly things with the Z-Tools...
I mean, that the empty space must be black - its far far away...

(When I put a plane behind my objects, the channel becomes darker then the front-objects, because its more far away then the hereos...
...but in this case, I need for all renderlayers an additional layer for only producing the correct zChannel - not good!!!)

Thanks for your hints,
Jörg

(Win 7, Maya 2015, Vray 3.15 nightly from Dez3)

[Komposer]

please help,
I´ve to start rendering as soon as possible.
Nobody have a hint!?

btw...I made a test with the official release 3.00.1 from Okt 16 - it´s the same prob!

[shaio]

Hi,
The white background is caused by the filtering option being OFF. It's a known bug, if you turn it ON the z_depth RE should render fine.

[Komposer]

Ivan, thanks for Your response.
The problem is, that I need unfiltered zChannels for the z-tools!
So, the question is, is it planned to work on this bug?
Cheers, Jörg

[Zdravko.Keremidchiev]

Another approach will be to leave Depth Black to 0 and set the Depth White instead as the Z-Depth channel uses by default.

[Komposer]

thanks for the hint....but...
This inverses the problem only!
Now You get a black back, where white would be the correct one
I hope it will be fixed in the near future.
Cheers

[sharktacos]

If I understand the problem correctly, there is currently a bug in V-Ray that will cause the background to be black even though the far value is white. As a workaround you can create a sphere for the background:

1. In the Maya scene create a primitive sphere and scale it to be super gigantic. If you can't see it in the clipping planes, don't worry. V-Ray still can see it.
2. In the render stats turn off "cast shadows" (so it won't block the lights in your scene)
3. Apply a Surface material to it and set the matte color to black (so it wont affect the alpha)

[Mr.Hoo]

And if you tick "get depth from camera" and "unfiltered" you will get the value of the near clipping plane in the backgound of the zdepth-channel.
I recently reported this behaviour.

Cheers!