Is it ok two polygon cross each other?

[orlagno 0]

I'm about to start modeling for arma3, and ther is a question I didn't find any clear answer for that.

For example let's think we have a cylinder and all faces normals are toward inside, now if we wana fill the middle of cylinder with a circle facing toward where we looking inside. Now the question is if it doesn't matter how it look from outside cylinder ( assuming we are inside or we don't care about outside ) what's the better option ?

1. Fill the middle of cylinder with a circle ( made of some polygons and exactly fitting its outside edges to the cylinder inner faces ).

2. Fill the middle of cylinder with a plate ( 4 vertex) that is bigger than cylinder and cutting it with 90 degrees.

 

Both ways when we looking inside cylinder it's a circle at the end , but about option number 2 , how is it going to render ingame actually? Is it going to be glitchy around where polygons go through each other without a edge separating them or it going to look like fine just like option 1 ?

 

I hope I could explained exactly what's in my mind, tnx for answering 🙏

[HorribleGoat 1473]

It would work fine both ways.

[x3kj 1247]

The description for this situation is "intersecting geometry". If the angle between the plates that penetrate each other is 90° its usually no problem.  If the angle is small however, z-fighting (flickering) can occur at the edge