Incorrect Shadow Shading

[ilinin]

Hi
I couldn'd find this reports on forum or anywere else.
It looks like Corona incorrectly rendering smoothing groups, when there is transition from round surface to flat.
To compare I've attached Vray render and scenes.

Does anyone knows how to fix it?

[GeorgeK]

Hi ilinin

At first look there is something wrong with your mesh,did you import it by any chance? (see scrnshot_12)

In the next example corona vs vray left hook has smgroup 1 for the straight part and smgroup 2 for the curvature. Not big differences here.

But it is strange that your model behaves differently in Corona, we will take a deeper look at this.

Lastly as a fast solution for your issue, apply turbosmooth on your mesh.

[Frood]

we will take a deeper look at this.

Shadow terminator. Try shift 0.05 for example.


Good Luck

[ilinin]

This mesh was done in max only, but the problem looks  very similar to CAD meshes.

Shadow terminator. Try shift 0.05 for example.

Shadow Terminator solved the problem. Thanks Frood!

[romullus]

Could you show wireframe of the mesh? I never saw shadow terminator issue on similar meshes, would be interesting to know what topology i should avoid.

[GeorgeK]

we will take a deeper look at this.

Shadow terminator. Try shift 0.05 for example.

Nice one thanks!

Could you show wireframe of the mesh? I never saw shadow terminator issue on similar meshes, would be interesting to know what topology i should avoid.

Attaching a screenshot.

[romullus]

Thank you George! I don't see nothing wrong with topology. Will have to keep shadow terminator in mind if i'll see strange shading in the future.

[GeorgeK]

Thank you George! I don't see nothing wrong with topology. Will have to keep shadow terminator in mind if i'll see strange shading in the future.

Apparently this seems to be something with the rotated edge topology and the curvature that it didn't like. I did a quick edge flow and straightening and the issue disappeared like exactly with the tubes I posted on the initial screenshot.

Reported.

(internal id=459035582)

[Frood]

there is something with the rotated edge topology and the curvature that it didn't like

Depending on what you've exactly found or fixed: it may be a suitable fodder for Corona Scene Check if you see any chance that issues like this one could be detected generally :]


Good Luck