I added a landmass and applyed a material to it without falloff. And it results in angles appearing along the spline line.
Is there a way to have the texture go along with spline and not cause this?
Did you figure this out?
The angles are the result of the pixellation effect of the painted item.
You would need to change the material and merge it with the base layer in a different way - using a height texture or using a completely different image to goverb the portion that ranges between .1 ans .9 alpha of the layer above.
Its not simple. But it is doable.
Aletrnatives could be making the landscape smaller.
The smaller the landscape the less you should be able to see solid pixels.
And ofc, you can always touch up the paint manually?