[#cinema4d #ProRender ] How to use Light portals?

WusikiJeronii

Hello everyone. How to use light portals in ProRender? I created a plane, added a compositing tag to it and then I turned on the light portal checkbox. But the light portal doesn't work at all. I tried to disable my portal and compare results. And nothing has been changed.  And yes, normals are faced to my interior.

throttlekitty

I'm not familiar with either, but to ask the stupid question first: Do you have a light in the scene, and is it sufficiently bright? Mos of what these do is act a bit like a magnet for light samples to reduce noise without having to get crazy with global settings. 

I couldn't find appropriate docs for ProRender, but according to c4d/Corona, the plane also needs a portal material applied.

WusikiJeronii

throttlekitty said:

I'm not familiar with either, but to ask the stupid question first: Do you have a light in the scene, and is it sufficiently bright? Mos of what these do is act a bit like a magnet for light samples to reduce noise without having to get crazy with global settings. 

I couldn't find appropriate docs for ProRender, but according to c4d/Corona, the plane also needs a portal material applied.

I don't use bright lights and I wanna render a middle-dark room. A scene doesn't get enough lighting 'cos I get a noise.  I need to use portals because of that.
ProRender can't use the portal material. In r20 portal was included in the compositing tag. 
https://help.maxon.net/us/#TCOMPOSITING-COMPOSITINGTAG_GROUPRPR

WusikiJeronii

I've found a solution. But I don't understand why. In my scene, I have a room 5000 cm x 5000 cm. I decrease scale to more real sizes (200 * xxx cm) and it works. Can anyone explain to me how sizes depend on my issue? I think small portals get small intensity.

Animas

Im also not familiar with both software, but tbh, the room that is 50 meters width isn't much of a room and could almost be considered outdoors. Since they say that ProRender is a physically based renderer I have no doubts the room will be most likely dark with just a simple light coming from window (most likely, not sure what the scene or setup is). So when you made the room more physically accurate, the light started to light up the room.

WusikiJeronii

Animas said:

Im also not familiar with both software, but tbh, the room that is 50 meters width isn't much of a room and could almost be considered outdoors. Since they say that ProRender is a physically based renderer I have no doubts the room will be most likely dark with just a simple light coming from window (most likely, not sure what the scene or setup is). So when you made the room more physically accurate, the light started to light up the room.

Maybe but proportions haven't been changed. It was a cube - 50x50x50. Thanks. 
P.S.: I also not familiar with ProRender. It's my first test. And I like that. I think ProRender looks not worse than corona.

Eric Chadwick

paging @BEEFDOCTOR