First of all, I have been using Corona via 3ds max for a long time and I would like to mention a few things I have experienced.
Recently, while browsing a model sales page, I saw very nice rendering photos and wanted to examine the profile of the person who made them. Frankly, I was surprised because we were both using corona render, but my renders were not even close to his renders.
When I looked into it a little more, I realized that it was using corona through Cinema 4d and I wanted to focus on that and try it.
(I would like to say that there are minor differences in lighting and camera settings, but I don’t think much will change)
I wanted to share the results with you and the corona team.
These are just preview images of the library, I mean can you show the material settings, bump strength, material values etc. Since you are using Cosmos assets then that might be an issue that the Corona team can investigate since I use my own libraries.
Make sure that all scene components are matching as close as possible, that includes render setup, material settings, texture filtering, lighting, camera angles and so on. Otherwise your comparison is pretty much meaningless. Overall, i think some tiny differences might be expected, due to some specifics of renderer integration in a DCC, but if you’re proficient user in all the programs that you’re comparing, you should be able to get virtually indistinguishable result.
Yeah my first thought is the normal/bump value might be 0.3 in 3dsmax compared to 1.0 but its just a wild guess if it was converted from Vray. Without seeing the material setup and matched settings/lighting etc its a bit hard to tell at this point.
I recreated the scenes and tried to make them similar.
I share the results with you.
I would also like to point out this.
Materials, lights etc. I did everything using corona.
I did not use materials from Vray.
I did not change any settings of 3ds Max and Cinema 4d, they are the original settings.
I think the problem is caused by the poor specifications of my computer and the limitations of the applications (3ds-c4d).
In regards to my comment about Vray conversion, I wasn’t talking about you converting it I was referring to how Cosmos converted it, if that’s the case.
Where are the material settings? Most of these screenshots are irrelevant. Check the attached images. You should show both for 3dsmax/c4d. bump/normal settings may be different between the two if Cosmos didn’t interpret them correctly, they should be 1.0 or 100%, not 0.3 or 30% if that’s the case.
Materials look fine to me. How are you matching your lighting? I can see your backdrop, highlights/shadows look different. Can you just render both with the same light, a skylight with 255 white light. Does it still look different?
Bump seems much stronger in your C4D version than in 3ds Max. At first i thought that maybe it’s because of wrong gamma, but since you’re not using normal maps, but rather old fashioned bump maps, that should not be the case. I never used C4d, so i can’t possibly know that, but maybe 1.0 bump in 3ds Max does not equal to 100% in C4D? Also, do you use Corona bitmaps in both DCCs?
Edit: try to eliminate difference in lighting, it’s clearly visible that this part is not matched on your side. Maybe it would be better to completely disable environment lighting in both programs, so there would be less variables.
Apart from obvious difference in bump strength, i think the two renders are fairly similar, isn’t? There are some visible difference in shading, so maybe Corona uses different default BRDF models in both DCCs, or maybe your materials are not exactly identical.
I think it’s true for normal maps, but not necessarily so for bump maps. Anyway, someone from the team should definitely know the answer.
