where is Z-coverage ?

[theo]

looks like the coverage (or z-coverage) g-buffer channel is missing from vray.
this makes most of the other channel useless when compositing.

[blinkimage]

isn't it under the 'G-Buffer/Color mapping' rollout?

[theo]

exactly .. the coverage channel is missing from the g-buffer rollout !
that's what I meant

[theo]

now if anyone has more info or trick on how to get a z-coverage channel from vray I'd be glad to know.
for me without coverage; zvalue,objects or materials channels are totaly useless...

I don't understand how this didn't get in the top5 request until now..unless I missed something.

I have to add, that would make us very sad having to use another production renderer..

thanks in advance.

[harakys]

yeah, i have the same problem with the special camera type from vray, he doesn't render the z-coverage, so that was impossible to create a dof in post-production.

But, with some tricks, you can have a render of the z-coverage, just select all your objects and give us a standart material with a falloff shader (type: blend distance) into the diffuse slot and instance it into the self-illumination slot (check to use the color in self-illumination slot). Then Turn off all your lights and the GI calculation. Now you can render your scene and you will have a faked z-coverage picture...

Welcome into the world of Mac Guyver

[theo]

i have the same problem with the special camera type from vray

are you sure you don't mean z-depth instead of z-coverage ?
apparently coverage is absent from vray g-buffer channels no mater what camera you use..

the coverage channel stores anti-aliasing data at the edges of objects in the scene.
and is therefore essential for any postproduction job using the z-depth channel or materials channel or objects channel etc...
without it, no proper depth blur, no depth fog, no texture replacing, no material colorcorrecting etc.. without aliasing artifacts