Cylindrical cut - strange shading

Kowalski

Hello, i need your help.
I created a cylinder and cut a box shaped hole.
When i fixed the topology and rendered, i noticed this weird shading problem.
Any ideas, what to do?
Thankss.

In Viewport




In render

Dethling

The problem are the support lines.
Your corner consists of four edges, but only two go all around the cylinder, this creates a pinch.

I would extend all horizontal edges around the cylinder and would see if I can also put the vertical edges the whole way down.
This will probably create some pinch in the cylinder, too, but with a little bit tweaking (while "show end result" is active) you should be able to reduce it.

Also rember depending on the scale of the object and where it is in your model (and what the model is for) not everything has to be 100% clean/correct.

Kowalski

I thought about it too, but it is difficuilt to keep the cylindrical shape with all these support edges :P but thanks a lot for help, i see that problem now.

Lazerus Reborn

Just a heads up since a few of these threads are creeping into General, Technical Talk is a solid choice for questions like this. (Not trying to step on toes, you're just more likely to get answers there )

EarthQuake

Not only that, but we have a thread dedicated to these issues here: http://www.polycount.com/forum/showthread.php?t=56014&page=139