How to effectively composite in Octane?

[rodross]

So I need a specific color to come through all of my refraction and transparency. All of our projects are rendered on an 80% white endless background.

If I use a big plane as a backplate to get that gray into the refractions and transparency, that's ok, but I'm stuck without being able to alpha out the backplate.

Then if I need floor shadows, I can use a matte plane under the product, however, it will show through the HDRI...even if I have a backplate plane with 80% gray. I've tried using the object tag and checking off camera visibility while leaving shadow visibility on. I've tried two skies, nothing works.

[aoktar]

one picture is worth than many words? are you happy to show something for problem?

[rodross]

[rodross]

I hope that pic helps. I forgot to label that you're seeing the HDRI on sky object behind the shadow catcher, instead of the backplate, but I think that's pretty obvious.

In c4d, I had a floor object as a compositing BG and a BG object, all with 80% gray material on them. As well, I switched off GI reception on the floor so I wouldn't get HDR blotches. I can't seem to replicate a similar endless background setup in Octane.

[aoktar]

my solution is mixing hdr and some color on ground

[rodross]

Oh nice, yea that should work! Thanks!

[rodross]

RotX and RotY seems to break when not just using an imagetexture. Is that happening for you as well when you do this? I actually can't even seem to rotate the sky manually either.

[aoktar]

RotX and RotY seems to break when not just using an imagetexture. Is that happening for you as well when you do this? I actually can't even seem to rotate the sky manually either.

rotX and rotY is rotation shortcut for internal tranform node. You can create a transform node in imagetexture to do manually

[rodross]

That doesn't seem to work on any axis but the Z, if you're talking about going into the image texture and using the UV Transform. How do I get my XY rotational access back?

[rodross]

Scratch that, I didn't see the T.X and T.Y. Thanks again