Matt shadow inconsistent behavior

[geo_n]

Not sure if this has been reported.

Octane renderer still renders objects with disabled cast shadow property on matt objects.
I have a big flat poly set with matt material with two overhanging reflector poly with cast shadow unchecked.


Octane overrides object properties of the reflectors and enables cast shadow in alpha.


Converting to lw and making big poly have shadow catcher node lw renders it with correct alpha.

[mikefrisk]

I do not believe Octane sees the "cast shadow" option, everything casts a shadow if its in the scene no matter what. Your only current option would be to remove it from the scene or uncheck it in the scene editor.

[FrankPooleFloating]

Umm, geo_n, I know we have had our differences and all, but it is my experience that [x] Cast Shadow only applies to Octane lights... not HDRI/ambient... Hope this helps.

[geo_n]

This is a bug in octane core. Its just broken from another thread I saw. And its only busted for matt shadow from what I remember.

http://render.otoy.com/forum/viewtopic. ... ty#p201250

"The shadow visibility doesn't work, if checked or unchecked the shadow is always visible for the visible or invisible object."

I'm using the octane sun system with no hdri contribution there shouldn't be shadows there even without importance sampling. In any case we need full control per object properties because there are many instances that a scene will have reflection cards, fake environment generator, etc. We're doing vfx afterall its better and faster to fake reality.
Frank, don't worry about it. Difference in pov that's all.

[FrankPooleFloating]

Roger that. But these were exactly the kind of shadows in alpha on matte that I was mystified about...

[geo_n]

Matt materials in most appz usually have the shadows in it but it shouldn't have the shadows of objects that are purposely set not to cast shadows. I had to move the sun direction in that scene so the reflection card's shadows will not be seen on the matt plane.
But this is a big limitation if we use domes for environment and can't exclude it to cast shadows.