Godot Normal Strength Node

This is an addon for Godot 4 that adds the NormalStrength node to the visual shader system. This node lets you control normal map strength.

Method

Unpack normal map.

vec3 normal = vec3(%s * 2.0 - 1.0);

Multiply X & Y with input scalar value, then repack the normal map.

vec3 normal_strength = vec3(normal.xy * %s, normal.z) * 0.5 + 0.5;
%s = normal_strength;

For normalize set to yes,

%s = normalize(normal_strength);

Installation

You can get it from the Asset Store in editor.
Or extract the zip file and copy the folder to your project. You'll need to restart the editor for the node to appear in visual shader.