That's probably an implementation issues that manifests on your hardware called shadow acne/self intersection. It's explained here[0] 0: https://www.scratchapi

That's probably an implementation issues that manifests on your hardware called shadow acne/self intersection. It's explained here[0] 0: https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-shading/ligth-and-shadows https://www.scratchapixel.com/lessons/3d-basic-rendering/int...