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DasFrodo

Redshift AO Node incorrect result when rendering

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Hi everybody,

 

I'm currently working on some more complex shader setups to get used to the Redshift Material system. I'm now facing an issue that I cannot figure out. The AO node / shader has some weird behaviour when I do the final renders (render in picture manager) of my scene. It does render correctly in the IPR, which is the weird part. Best explained with two pictures:

Cinema_4D_Mdv1foeZvZ.thumb.png.272165b5c0a44a11eabe409c6539dabd.png

In the IPR the AO shades across multiple objects, as expected

Cinema_4D_Lq1ArDD4Gk.thumb.png.5b87c0aad0b5ddb1c56f1947a9c23a77.png

In the Picture Viewer the AO does seem to ignore certain objects in the scene and doesn't shade them at all. It DOES include them in the calculations of neigbouring objects but it does not shade them.

 

I can't find any rhyme or logic to this.

  • If I render multiple times it does always look the same
  • I can't find any logic in which objects get shaded and which don't
  • Normal orientations on all objects are fine
  • There is no modifiers / generators / ... on any of the objects. These are all pure polygonal objects

 

I have attached a reduced scene file.

 

Does any of you have any clue why this is happening?

 

[EDIT] Just noticed that the error goes away if I enable automatic sampling in the experimental system settings. So it seems like it has something to do with sampling?

[EDIT2] Okay, what the hell is going on? If I set Unified Sampling to 16 16 it renders correctly, but if I set it to 16 64 for example it screws up again?

[EDIT3] Updating Redshift from 3.0.20 to 3.0.22 didn't fix it unfortunately...

 

Old_Car.zip

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Alright, this is more than likely a bug or there is something fundemantel about Redshift that I do not understand. I will post this over in the Redshift forums and see what they say. I'll update here.

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I got couple of errors while loading scene, maybe due 2.6.54Demo version of Redshift...

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Definitely. 2.6 is way too old. They switched to an entirely new shading core recently as far as I understood.

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I was downloaded this demo maybe 3weeks ago

And it only allow this version as demo as I check now

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Yeah the Demo they offer on the website is sadly by far not the newest version... it doesn't have the MAXON Noise, for example 😕

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MAXON Noise?

...It´s not in other thread? :-)

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Yep, MAXON Noise! Redshift integrated all the noises that C4D has in their native material system.

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Already got an answer in the Redshift Forums!

Apparently it undersamples AO by default in the Bucket Render, so you have to massively increase the AO samples, either in the global sample override (got mine up to 1024 now) or in the material. Working perfectly now!

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