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Cinema 4d plugin Spots light, ambient oclusion problem.

PostPosted: Sun Apr 11, 2021 11:45 pm
by Adiaz
Hello everybody.

First of all I'm sorry, I can't put this post where it belongs but it just lets me open a new post in this group.

My problem is that when I use octane inside cinema 4d and put a spotlight, the beam from that spotlight leaves a black spot in the ambient occlusion, I understand that this is because by default this type of light creates a fog, but I am not capable to deactivate the fog or get me to remove that black beam in the ambient occlusion.

Someone could tell me how it can be solved

Thank you very much, greetings.

Re: Cinema 4d pluging Spots light, ambient oclusion problem.

PostPosted: Mon Apr 12, 2021 6:22 am
by bepeg4d
Hi,
you need to remove the Scattering medium node in the attributes of the Spotlight, or adjust its values to have a more correct volumetric effect:
![](download/file.php?id=83698&mode=view)

ciao Beppe

Re: Cinema 4d plugin Spots light, ambient oclusion problem.

PostPosted: Mon Apr 12, 2021 9:35 am
by Adiaz
Thanks for answering so quickly.

I think the error is there, but in light settings I do not get the light medium options. Also if I get into the nodes I get the nodes without links, and even if I delete them I still have the same problem. Here I leave you screenshots of the ambient occlusion (Sorry, I don't know how to upload them directly to the forum)

https://ibb.co/RQrhMwW

https://ibb.co/N1f4kpX

Thank you so much

Re: Cinema 4d plugin Spots light, ambient oclusion problem.

PostPosted: Tue Apr 13, 2021 7:43 am
by bepeg4d
Ok, now the issue is more clear.
The solution is to replace the Volume SpotLight with a normal Area Light with reduced dimensions, and add the new Spotlight Distribution node in the Distribution pin:
E1DDD0BA-E110-4BA9-9F9B-6E5511382F54.jpeg


Here is an example scene:
SpotDistribution.zip
(73.17 KiB) Downloaded 30 times


ciao Beppe

Re: Cinema 4d plugin Spots light, ambient oclusion problem.

PostPosted: Tue Apr 13, 2021 9:07 am
by Adiaz
bepeg4d wrote:Ok, now the issue is more clear.
The solution is to replace the Volume SpotLight with a normal Area Light with reduced dimensions, and add the new Spotlight Distribution node in the Distribution pin:
E1DDD0BA-E110-4BA9-9F9B-6E5511382F54.jpeg


Here is an example scene:
SpotDistribution.zip


ciao Beppe



Many thanks. With this it is solved!

Thanks for the speed when answering.