Problem with landscape material lighting and normal maps

Development Rendering
1

Hi!
I’ve created a complex material wich uses allegorithmic substance textures and landscape layers to blend the different textures.
As you can see in the screenshots below I have a problem when the normal map channel is activated and has a texture connected. Without normal map the lighting is correctly displayed, but as soon as I had a normal map the lighting gets a lot darker but only in some zones.

Does anyone know how to overcome this problem?
I’ve already tried by disabling the normal maps baking by lightmass, using a dynamic sun light and adding a flat normal map to the shader.

Thank you,
Davide

Without normal map
d4710650d18ea1c49dc491c1a4632cc23cb4ca8f.jpeg

With normal map
04983cc95bdd2b09cbb1707cd95a68806a69ac43.jpeg

Without normal map
36ba922d42a2e98da1d892007693ffec58733f5f.jpeg

With normal map
a7eb3dcaaa9de284af84fc04226a01f585ab6f8c.jpeg

2

Maybe the normal map is way to powerful, can you post it?

3

Or it is not being sampled as a normal map. When you select the normal map nodes in the material, do they say “normal” under type?

4

Problem resolved!
It was the “Use DXT5 Normal Maps” enabled in the project settings. I’ve disabled it and now it’s all ok!

Thank you guys!