Object ID & Material ID render pass

[zoulag3d]

Hi,

I have a rather simple scene, 4 boxes and a curved gound plane as my backdrop. What I want is to make a render pass from the Object ID or the Material ID for compositing purposes. I set up the Material IDs (all the same for the 4 boxes and a different one for the backdrop), but when I rendered the pass, the 4 boxes have different colors. The same happen with the Object IDs. Then I tried configuring the Object Layer IDs from the Octane properties (right mouse click on the selected object --> Octane properties), but nothing changed. I also tried with the "Movable Proxy" option checked and it gave me different colors for all the objects once again. I noticed though, that by rendering a Layer ID pass it gave me the correct results.
I 'd like to know what am I doing wrong and what is the correct procedure for creating Object and Material IDs.
I am using the version 3.0-3.13 of the plugin.

Thank you for your support.

[ThaRaven]

assign the same material to all boxes? then all have the same material id

[zoulag3d]

Yes I did. All 4 boxes have the same Mat ID.
Thanks man for replying.

[ThaRaven]

just tried it.. when i assign "the Same" Material to all Boxes, then all show the Same Coller when i pick Material ID from the Render Rollout

[zoulag3d]

Sorry, I got confused. The 4 boxes have different materials, but the same Material ID.

edit:
The 4 boxes have different wrapping.

[ThaRaven]

would'nt it be easyer to use Render Layer, and use the "Render Layer Mask" Pass? or the Render Layer ID
Select all Boxes and Rightclick "Octane Properties" set them to Renderlayer 2 or someting..

[zoulag3d]

That's what I did, as a workaround for the Object IDs. But my main goal was to have an extra pass from the Material IDs because the material of the boxes have 2 different materials under a Mix Material, a glossy one and a diffuse one.


Beauty (from mental ray)


Material ID (from mental ray)

Octane has the option to render the Material IDs, under Render Elements ---> Info Pass: Material ID.
1. I'm doing something wrong here, and if so, what is the correct workflow to achieve this.
2. Is this a bug?
3. If it is a bug, is there a workaround?
4. If it is a bug, can the developers fix it in the next version of the plugin?
It is crucial to be able to render all kind of masks for the compositor to work for the final render output.

[paride4331]

Hi zoulag3d,
You could solve the issue using the IOR layer.
Using a big difference of IOR between a material and another, you will have a black and white layer more contrasted.
I hope it can help you
Regards
Paride

[zoulag3d]

Clever!
Thanks for your reply