OTOY Forums

Hurricane046 wrote:Well we're trying to achieve this desired "grouping" in one render. Beauty + all the desired masks in crypto. Using ocol with red, green and blue channels doesn't give you that many groups to work with.

So far I haven't found a way to tell crypto "yo, group these 5 objects for me into one mask and these 13 objects into another mask and so on...". Using CryptoMaterialNodeName is a stable way that doesn't change seed BUT it's not great for many other cases because the user can't group stuff together as he wishes (renaming materials to force a crypto group seems like a crazy way to do it).

Powel2097 wrote:Hi ,

in the latest 2020.1.2 when enabling cryptomattes I only get transparent images.
Sometimes with edges where the motionblur appears. the rest is transparent.

When switching back to 2020.1.1 it works as expected.

It happens in every scene. Even with a simple box in it.

EDIT:
I just noticed it is also happening in 2020.1

frankmci wrote:

KeeWe wrote:No, I just started the rendering again. If I can spare some time, I'll try some scenarios.

But even if I change the Objects or material count, isn't it possible to maintain the already given color plaette? Say my scene is finished but the client wants one more treet far in the back. I think its a no go if adding the object screws up my entire Postwork I already did, there has to be a solution. I can't believe big studios could work with this limitation.

Maybe other users could share there experiences with cryptomattes...?

aoktar wrote: I didn't see this case on my sample scenes. Have you changed the count of objects in the scene while rendering?

Yup, I can confirm this. Simply re-sending the exact same scene to Octane generates completely new Cryptomatte colors. It's quite a pain having to re-assign the mattes every time a new render is updated in AE, so for the most part, we don't bother with Cryptomatte. The crypto passes are there in the picture viewer in C4D.

Here's a sample for what it's worth, Ahmet.