Smoothing issue with Normal Tag and Phong Tag

[mpta]

Hi,

When i want to render the object with Normal Tag and Phong Tag (I need both) it doesn't render properly.
There are some smoothing issues close the the edges. Other render engines works fine so it's Corona issue (can't test it in 3Dsmax)
I need to keep Normal Tag and Phong Tag because it's Nurbs data converted to poly (FBX) then imported to C4D.



Best,
Mac

[Beanzvision]

Hi there, are you able to share the file with us? Either here or via our private uploader https://corona-renderer.com/upload

Thanks,

[Beanzvision]

Can you also try to do a final render (not IR) and show the result? Is it the same as IR?

Thanks,

[mpta]

Hi,

I am sorry but I can't share it. It also happens when I try to final render.
Please try to test with any more complex cad data converted to FBX and imported to C4D with Normal Tag.
I am sure it will be the same issue. It was not only on this part. It's almost on every object with hard edges. It happens only next to the edges so big smooth surface is not affected.

Best,
Mac

[jgrundmeier]

Ran into this issue as well, only happens in IR. Final render seems to be fine.
R20.028 / Corona DailyBuild Oct 10 2018

[Beanzvision]

If it's just the IR then this is a known issue to us. Any chance we can study this model? We have a private uploader (for our eyes only), link is in my signature below. Thanks

[jgrundmeier]

If it's just the IR then this is a known issue to us. Any chance we can study this model? We have a private uploader (for our eyes only), link is in my signature below. Thanks

I can upload the file tonight. Thank you

[Beanzvision]

If it's just the IR then this is a known issue to us. Any chance we can study this model? We have a private uploader (for our eyes only), link is in my signature below. Thanks

I can upload the file tonight. Thank you

Perfect, Thanks!

[mpta]

Ok I've uploaded the part as fbx.
Thanks

[Beanzvision]

Thanks, I'll take a look!

[Beanzvision]

I did notice that even before rendering that the mesh was having a problem from the import. Or maybe the problem is from where it came from and the way it was exported? I opened/rendered this in both Max and C4D. Max had a better time handling/rendering this file than Cinema did. I'm not sure why that is. But I don't think it's Corona related though. If it were, then I think both IR's would display artifacts. No amount of adjusting, removing or replacing the normals and phong tag seemed to fix this. If you can shed some light on where it was created and how it was exported, that would be great.

Max:


C4D:

[mpta]

Hi,
When you import to C4D please make sure that you uncheck "Convert Normals to Phong Tag Edge Bkreaks" and keep "Normals" checked.
please try to render with just sun and sky and pls use low glossy material.

[mpta]

Can I ask for an update please?
Were you able to recreate an issue?

[Beanzvision]

Hi, where are the original models coming from? What program exactly?

[Beanzvision]

Okay, after some more testing and importing your file with a variety of different settings other than the default. I found this combination to be the best and without any artifacts.