Hi folks. I’m new to doing 3D in Unity but not new to Unity.
I’ve made a box (with only 6 sides/polygons) in 3ds Max and exported it as an fbx. I’ve dropped it in the Asset folder my Unity project and then from there dropped it in my scene.
Can you see all those diagonal line marks near the edges of my box? What are they and how do I get rid of them? The geometry there is one flat polygon so not sure whats going on here.
Thanks
It’s shadow acne, play with the settings of the light in your scene.
Shadow Acne lol. So is this like sub-polygons creating shadows in my model or something?
Nope, it’s the object surface shadowing itself. By increasing the light bias and/or normal bias (see: https://docs.unity3d.com/540/Documentation/Manual/ShadowOverview.html), you tell Unity that receivers closer than the bias value to the occluder should not be shadowed.
If shadow maps had infinite resolution (which they don’t), shadow acne would not be an issue. But hey, in the digital world, we have to deal with the discrete nature of things.
There’s a lot of funny names for common graphical artifacts. “Shadow acne”, and its opposite “Peter panning” (which happens when the bias is too large, giving the impression that objects are floating above the floor because there’s no contact shadows) are fine examples 
