That remaining shadow in front of the tree is probably casted using the light source that is not switched off. The bottom line status bar says there are 8 light sources in the scene.
How did you implemented the colored light sources on the tree?
1) If they are regular cinema omni lights with centileo light tags then by default they will cast shadows on the shadow catcher. In this case you can set shadow catcher matte weight to zero for all such lights.
2) If you have implemented the colored light sources on the tree with the spheres and emission material then they will not produce the shadows for the shadow catcher object and will not affect it. This is a preffered way for render speed for this scene if you don't enable imprortance sampling for such emission materials because their lighting is local.
If you want the shadow catcher object to receive the shadow only from the one light source or Sky HDRI then only this object (using CentiLeo light tag or environment tag) should have shadow catcher / matte weight equal to 1. And all other unwanted light sources should have shadow catcher / matte weight equal to zero.

Hi Vlad! Welcome to CentiLeo! Here we prefer speaking English. Thank you for the question! In the future we will certainly translate CentiLeo to Russian language, the challenging part will be to translate the documentation, there will be lot's of work.

Enable Transmission channel for glass, it has IOR for refraction. Alpha channel has no refraction IOR and has no roughness.

Have a look at this post: https://centileo.com/forum/messages/forum19/message1567/83-centileo-for-cinema-4d-044-available#mess...
And this https://centileo.com/forum/messages/forum19/message1590/83-centileo-for-cinema-4d-044-available#mess...
In short, there can be Filter settings in PV turned on/off. There can be "Send raw AOVs to Picture Viewer" enabled in AOVs tab of CentiLeo render settings.
Just check these options

Do you animate the brightness? How many light sources are there in the scene? Btw, it's not easy to detect the issue without the scene itself.

Hi Ivan.Huang, and welcome here! I know automatic material converter is surely very much needed for us. We will start working on it soon, I hope it will be released in 0.67 release and it will include standard C4D materials, Octane and Redshift to convert from.

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ds wrote: Trying with 4 samples and no de-noising and I notice there's a lot of variation in the lighting where I wouldn't expect from frame to frame. I have importance sampling turned on on the emissive light material, could that be doing it?

Not sure what's wrong there. Do you mean variation as "more noise" without denoiser? That would need more iterations to resolve. Improtance sample On/Off for emissive light has slight difference between them. To get less or no diffrerence between these two options the "light shift" parameter should be zero, it's placed under material "bump" section.

You may test what settings really work for example by testing the animation in lowres just to get quick renders, then apply denoiser. Denoisers behave this way on extreme low sample counts.

It looks like you use denoiser and low sample (iterations) count. That's why it flickers. CentiLeo doesn't use biased techniques inside.

Actually only experiments will help to find the right settings here. On CentiLeo side we will implement a lot of AOVs (extra images), mask images, some funtionality to combine them in the output. It's all possible because we have a very good architecture to support the render and output of really many images at once.

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ds wrote: Ram usage not that bad, when I was rendering before it would immediately crash with the memory error, but now it's fine.

Have you seen these crashes in Cinema+CentiLeo? 17k or 170k polygons is really nothing, so there can be some bug or anything else, maybe a lot of polygons. I would like to investigate there if you can send me your scene that crashes.

Hi S1512, thank you very much for kind word! Welcome here! We work with great enthusiasm! A lot of very important features are on the roadmap. Volumetrics are there too, but they will appear later than other important things

Solution:
This article from Manual describes the way to enable Cinema 4D textures from Asset Browser for CentiLeo:
https://centileo.com/docs/index.php?COURSE_ID=3&LESSON_ID=57&LESSON_PATH=17.57

It looks like you are doing a very good AI progress! Actually I can't believe such cools things are coming to life! Hope to test them at some point.
Blender is a good path, but I would also recommend not to forget Cinema 4D, first of all because it's also very cool and progresses nicelly, and also because CentiLeo is there

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ds wrote: This issue was fixed by lowering the poly count on the models I imported from zbrush.

How many polygons in total? Maybe your loader adds polygons each frame without releasing memory for ther previous frame? If that's some kind of Alembic it looks strange. What is your RAM size and what's the memory consumption in the Windows task manager during the PV render?

Looking forward to see you animations!

Glad, you fixed this! Btw there are also options in C4D file saving something like "Straight Alpha", "Pre-multiplied Alpha".
Also in CentiLeo render options (in AOVs tab) there is "Transparent Background" option that also kills the reflection of background on reflections as far as I remember

Hi RAin3D_! I have fixed the issue with polygon restriction tag names in Chinese language.
Thanks a lot for reporting this issue and giving the files that really helped!

That's fixed! Sorry for that stupid issue, I haven't tested really well in that area

Actually to change the output range of Bitmap image the Map black/white can be changed. They help to scale or invert the image. This is an example of invert:


You can also change the distribution of the values between black and white colors of the image. For example this can be done using CentiLeo gradient node. Just look that middle grey values in the gradient ramp are changed to prefer darker values for the larger part of the input range.

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ssjenforcer wrote: I have the colour texture and glossyness and reflection which I know where to map in the material, but what about metallic?

CentiLeo has roughness, not glossyness. They are reverse to each other. You either reverse the glossyness texture using output black = 1 and output white = 0 or enable "Use glossyness" flag in material settings.
As for metallic - it's not directly supported right now, it can be used to tune behavior of reflection parameters. I will make a slot and a mode for it. Currently the picture of metallic can be assigned to IOR, but the range of bitmap metallic should be adjusted, because for metals the IOR should be larger than one. E.g. you can experiment with metallic bitmap output black = 1.5 and output white = 4.0.
Reflection1 and Reflection2 are absolutelly the same reflection, but there are 2 of them one on top of another one to get more freedom in hand for various metal implementations.

Thank you!
Are you doing machine learning experiments in a separate application to C4D? Or in C4D itself?
I am quite interested in finding a fix to your reported issue.
Btw, in one of your past topics you talked about supporting matrix color attributes https://centileo.com/forum/messages/forum19/message1207/220-if-i-have-a-spherical-field-with-color-r...
This is supported since some time ago: https://centileo.com/news/145/centileo-for-cinema4d-0610/