OpenEXR with ObjectID's

#1

Hi,

I haven’t found a way in fusion to access individual Object ID rendered out from 3dmax.

Say I make a box set it to objectID 1 and a cylinder and set it to ID 2.

I then render out to 32bit bit uncompressed openEXR and add ObjectID in the channel setting.

In fusion how is it possible to access ID1 and ID2 seperately? Under the format tab of the loader I can access the object ID but it looks like the same white matte for all the ID’s together and not a different coloring per ID. Tried with channel boolean as well with no luck.

Thanks for the help!

edit
Problem solved! It appears that there is still very a slight variation in the RGB values which I didn’t notice before. It all looks like full white but can still tweaked and seperated with some color correction.

#2

Hi Dreamie,

Could you provide an example of how you went about seperating the objects using colour correction? I’d be extremely interested in how you done it!

Thanks!

#3

No problems,

My mistake was that I forgot a float in a value like that means value between 0 to 1. Another forum helped me remember that. :slight_smile:

So if you look at teh RGB values you’ll see that each ID has a corresponding RGB value so ID 1 means RGB 1:1:1

If you do almost any color manipulation you’ll be able to range out those colors.

In order to matte out different masks from those values… There many many ways. I found it easiest to add a float16 background with the same ID color and mask out it’s difference.

I made a quick comp here:
http://www.sendspace.com/file/nm78di
It’s pretty straight forward. :slight_smile:

#4

I saw the comp…

I hope you know that most tools can use the ID’s directly out of the loader to isolate their effect right?
I mean, the comp you suggested is fine, but it is way redundant considering there is a simpler way of doing this.

For example:

> Open the same comp
> pipe the loader to a CC tool
> go to the “common Controls” Tab of the CC tool (radioactive icon)
> check “Use Object”
> click and hold the “Pick…” button and drag it onto your image to pick the desired object.
> tweak the CC and behold the isolation…

This is the most efficient way of doing this, so hope it helps.

#5

Yes that’s pretty useless! I did actually reminded in that few days after I sent my reply here. . I used it in fusion’s early days but since then didn’t really have a use for that so I guess I totally forgot it’s there. Had no reply from that guy who asked for it so I didn’t see a point to notice that…

#6

I wouldn’t say your method was useless, but I was just pointing out a more efficient method.:slight_smile:

#7

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