Light passes don't premult correctly Tweet

[ptunstall]

Hey so lighting passes don't premult correctly in compositing. I've linked the HIP file and render below.

SCENE: https://www.dropbox.com/s/lf4w14gpl95jl ... e.zip?dl=0
EXR: https://www.dropbox.com/s/iyfqmgrvfhml5 ... 1.exr?dl=0

[juanjgon]

Hi,

What problem do you have exactly with the light passes? According to the docs, they must be added together to recreate the original render in post.
https://docs.otoy.com/StandaloneH_STA/S ... Passes.htm

Thanks,
-Juanjo

[ptunstall]

Yes traditionally adding them back together has worked. If you were to checkout the exr linked you'll see that doing this reveals an illuminated edge akin to unpremutliplied renders. Even if I premilt them again the edge still shows up.

[juanjgon]

So, did this feature work fine before? Do you know the latest Octane version where it was working fine?

Thanks,
-Juanjo

[ptunstall]

Yes we've used this feature a lot in 4. I haven't used it much since moving to 2018.

[juanjgon]

Sorry, can you please send us the .orbx file from the scene used to render these to light passes? I've been trying to reproduce the problem using your Houdini scene, but somehow I can't get this kind of lighting, so I'm not sure if I can see the same problem here.

Thanks for your help!
-Juanjo

[ptunstall]

sorry for delay:

https://www.dropbox.com/s/0oj5pfpbqheld ... .orbx?dl=0

You can see the issue easily in standalone. Just select ln1 or ln2 in the viewpoint.

I'm using multiple rops and also layers maybe it's something to do with layers?

[ptunstall]

Any info on this?

[juanjgon]

Hope, sorry, not yet. I've sent the scene to the core devs to check it, but I have no news yet.

Thanks,
-Juanjo