Why my normal maps padding look all jagged?

[Scudd_Kidd]

low poly MUST have sharp edges or the normal map will introduce bleeding like the normal map you have made. also unlike what you said , the low poly must be on top of the high poly not the opposite, thirdly, there is no need for a subsurface modifier if we use bevels actually most people have to choose between the two to get bevel normals.

Should your low poly mesh use hard edges when baking a normal map?

What happens if you don’t use seams on every hard edge? A common uv mapping tutorial has people mark seams on a cube in a way that won’t separate the faces on the UV map, so the end result is just one island. If I wanted to bake smooth edges on the cube, would that mean I should have an island for each face on the uv map?