OTOY Forums

Hello everyone, hope I am not posting a "new but very old" topic. My goal is to render an interior scene, as the sample below, being able to re-render *only* some materials several times (say for example, the floor), without needing to re-render the whole scene. In other words, is there a trick to render the floor, replacing the parquet with tiles for example, but hiding all the other elements?
ps: while writing down my question, I feel like the answer is no! But maybe you can suggest me some undreamed-of solutions

- change a kernel to deep_chennel_kernel
- choose type: Material ID
- lets it render for 2000 s/px
- copy the render to clipboard
- Photoshop: FILE->NEW and paste the render
- you can now make a selection of every material easily by the magic wand tool

Depending on why you want this, I would like this too. I find it would be useful to render 'elements' of the scene, either by rendering only one surface or rendering an area of the image. I want this for setting up materials better. But that might not be why you want it.

a render region feature would definately help here

and what about a render region masked by id materials numbers?
ciao beppe

That's the point! Yes A2Zen, you can work with post-production in Photoshop using material id pass, and I use this feature quite a lot... However, what I am looking for is a way to render a specific element (say a couch for example) with different materials (re-calculating the material specs as reflections, refractions, etc.) without having to re-render the whole scene, avoiding hours and hours of rendering just for one single material change...

As I can see so far, there is no way ( Thanks guys!
Marco

If render region would be ready then you could at least combine that with the material ID pass in post and select the specific render region out of the rectangular region.

That's right Refracty, that would be good enough to save time on renders and isolate parts I want to render more times..

I think the problem with the just re rendering a certain element is that the lighting and color of the surrounding objects is based on that object, so if it was a bright red, the surrounding scene will look different than if it were a white couch.

Because the way Octane works, I can't see them really trying to implement this any time soon.

However, a render region feature will obviously do almost exactly what you want. Just need to make sure it doesn't crop the image, but keeps the overall size with a transparent PNG so you can easily composite it.

I think rerendering a specific object / material should not be a problem with unbiased rendering because it is like render region with a non rectangular shape. But if you wanne hide things and still showing shadows or reflections it gets tricky...