Object Layer Helper Tweet

[SergKlyosov]

Hi Paride,

Can you please give us a short guide how to properly use this helper?
I'm especially interested in new workflow with include/exclude lights

Thank you

[paride4331]

Hi SergKlyosov,
I'm making it, and I will make some tutorial with all new feature as they will be SDK final.
Regards
Paride

[Rik]

Hi Paride

Did you ever produce this tutorial?

Specifically need to know how to exclude an object from being illuminated.

My scene has a sphere surrounding it with a 360 degree sky to act as the background/backplate for an animation.

I have an Octane daylight illuminating the scene but it also lights up the background sphere.

[Rik]

Any ideas on this Paride?

Exclude an object from daylight?

[paride4331]

HI Rik,
I'm doing it; I'll post it on next Monday or Tuesday.
Regards
Paride

[Rik]

Nice one, thanks

[paride4331]

Hi Rik,
are you referring to these as SergKlyosov asks for?
https://render.otoy.com/forum/viewtopic.php?f=51&t=69888
https://render.otoy.com/forum/viewtopic.php?f=51&t=69866
Regards
Paride

[Rik]

Don't think so.
Just need a light to only illuminate 1 thing.

I have a light which I only want to include a huge sphere around the scene. The sphere has a 360degree diffuse sky mapped on.
This is so I can control the brightness of the sky independently of the daylight.

So also need daylight to exclude the sky sphere.

Edit:
Sigh. It would appear that the sky sphere is stopping the daylight from illuminating anything. Guessing this is because even though I positioned the sun inside the sphere, it's calculated as being outside, no matter how big the sphere.

An octane light inside the sphere will illuminate the scene but then there's no environment illumination.

Edit of edit:
Thinking about this I reckon the problem is the fact that we have adjustable pupils to change 'exposure' instantly in the real world whereas Octane does not.
Don't believe it's possible to have a scene lit well for both internal and external at the same time.
If the daylight or HDRI/exposure looks about right for exteriors then it's too dark for interiors. You can't move inside without changing something to increase the light.
If you increase the daylight/HDRI/exposure so that the interiors are nicely lit, then the extra energy just burns everything outside including the sky to pure white.

That's why I've been trying to have separate control for the brightness of the background so that once the animation moves inside you can darken the background sky so it doesn't burn out when you turn up the daylight/HDRI/exposure to lighten up the inside.

Tried keeping the light levels ok for the external bit and brightening up the inside with interior lights but it doesn't look right. It's not what would happen in reality.

Any ideas?

Edit of edit of edit
This looks useful...
viewtopic.php?f=32&t=72595&p=368673&hilit=hdri#p368673

[Rik]

Would portals help get light inside?

Or am I stuck with animating the exposure and power of the texture backplate on a daylight system?

[paride4331]

Hi Rik,
yes, the human eye succeeds, thanks to its characteristics and the way in which it interacts with the brain, to give us a visual image with an extremely extended dynamic range than that of reflexes.
So it is not possible a photo or a rendering Interior Without Over-Exposed Windows: http://wearesophoto.com/interior-photography-without-over-exposed-windows/.
But we have a trick: you can use 2 suns as in my screenshot. you can use OctaneDaylight or HDRI and then set your backplate as you like, but it's not change your camera exposition.
You can also set reflection or refraction as you like.
I hope it helps.
Regards
Paride