Chaos Corona for Cinema 4D > [C4D] General Discussion

Comparison between 3DS Max 2023 and Cinema4D 2023

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MircoTosti Studio:
Good morning lads,

out of curiosity I did a comparison test between the C4D and MAX render engine and I noticed some really substantial differences on which I ask for your opinion (same scene, model, render settings, light, same camera parameters, materials, etc. etc.. scenes perfectly identical in all respects):

- render times are significantly reduced in 3DS Max, from 95 seconds to 72 seconds ... Corona in 3DS Max is 25% (and more) faster than C4D.
- the rendering of shadows and lights is totally different, in 3DS Max the light bounces are much more calibrated and even inside the rooms a completely better light reaches.

Can anyone explain to me why this is all happening?

TomG:
I am not sure those differences in the shadows are different GI calculations (because those are shared between both versions) - may be more to do with color calibration type stuff.

maru:
To make it easier to reliably compare images, please either attach them separately (see attachments here), or put them in some kind of slider like this:
1 - https://corona-renderer.com/comparer/qNDZ08
2 -  https://corona-renderer.com/comparer/qA6bKR

One major difference I can see is that one image is darker than the other. Other than that, they are very similar in terms of noise and quality.
The difference might be caused by:
- different tone mapping
- different secondary GI cache calculation
Another thing is that the clouds have a different pattern, and they affect environment lighting, so this can explain the difference in brightness. I suspect the scene setup between the two platforms is not identical.

Also, we would need to know a bit more about your tests, for example: Which exact version of Corona for 3ds Max and for C4D did you use? What is your CPU model? Were you doing some additional tasks in the background while rendering? (for example browsing the internet) Are your CPU temperatures within the acceptable range so that there is no throttling?

And lastly (and maybe the most importantly), rendering for just a bit over a minute does not give us a good understanding of real rendering performance. Using a pass limit (for example 100 passes) and then comparing the render times to reach this number of passes would be more accurate.



I think the "OMG" is not really applicable here. :)

MircoTosti Studio:
Hi guys, thanks for your fast reply.

Excuse me if I allow myself to make some clarifications because perhaps you have not paid attention to the posted images and what is written inside them:
- one situation is with "shadows active and affected" by clouds..
- one situation is with "shadows unaffected" by clouds..
- the mapping of the tones and the colors are IDENTICAL.. don't say that the color changes the tone or anything else, because I wrote from the beginning that all the settings and the parameters are the SAME, the scene, the materials and the settings are all perfectly identical ..
- in the situation where the shadows are not influenced by the clouds, there is always a notable difference in yield and times..

Both versions (3dsmax and c4d) are with the release 3 apr 2023 (as stated in the upper part of VFB).
Both tests were done by rendering ONLY the scene, without doing anything else otherwise it wouldn't make sense to make a comparison.
The machine is equipped with a Ryzen 7950x processor and 192GB of DDR5 ram, with the operating temperatures of the cpu during the rendering phase are constant at 69°/70° with 100% use for both 3dsmax and c4d.

I'll immediately do the test render with 100 passes and post both the times and the yields. Let's get to the bottom of it now!

Question: If the motor is the same, the version of the crown is the same, how can it calculate the secondary GI differently to such an extent that it changes the rendering of the scene?

maru:
Clouds do affect scene lighting. They are like an HDRI. Even if you disable their shadows, they still affect lighting, reflections, refractions, etc.
As you can see here, the clouds are different in your 3ds Max and C4D images:
https://forum.corona-renderer.com/index.php?action=dlattach;topic=40037.0;attach=183234;image
https://forum.corona-renderer.com/index.php?action=dlattach;topic=40037.0;attach=183236;image

If the clouds are different, then the lighting is different = you will not get identical results.

As to this question:

--- Quote ---Question: If the motor is the same, the version of the crown is the same, how can it calculate the secondary GI differently to such an extent that it changes the rendering of the scene?
--- End quote ---
The UHD Cache is biased and by default it is recalculated from scratch for each frame. You can get different UHD Cache pattern (different brightness, some hardly visible splotches) even if you re-render exactly the same frame multiple times. If you want to get rid of this factor, you can switch to Path Tracing as both the primary and the secondary GI solver, but then you will not be using the default settings any more.

Some minor differences between the rendered frames are expected. I am not saying that it is exactly what we are observing here, but it could be it.

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