There is a OBJ model.It has two normal textures,one is normal texture,and the other is detailNormal texture.
I want to ask if there has any method to blend normal texture and detailNormal texture?
three.js only supports a single value for normalMap. So you need a custom shader or an enhanced version of MeshStandardMaterial(via onBeforeCompile()) that can handle two normal map inputs. In your shader, you can sample both maps in the fragment shader and mix the respective values before usage.
But I do not know how to load map, AOMap,roughnessMap or other map when using shaderMaterial.
And it dose not have light and shadow.
I am trying to use ```
THREE.UniformsUtils.merge
Can you give me some hints?
(2)I found a case,[materials_nodes](https://threejs.org/examples/webgl_materials_nodes.html),I don’t know if this method can blend two textures?