diff --git a/wadsrc/static/shaders/glsl/material_normal.fp b/wadsrc/static/shaders/glsl/material_normal.fp
index add1288129..b74bd596ff 100644
--- a/wadsrc/static/shaders/glsl/material_normal.fp
+++ b/wadsrc/static/shaders/glsl/material_normal.fp
@@ -35,11 +35,24 @@ vec3 lightContribution(int i, vec3 normal)
 	}
 }
 
+float lightLevelContrastAttenuation(vec3 normal)
+{
+	vec3 lightdir = vec3(0.55708601453, -0.7427813527, 0.37139067635);
+	return clamp(dot(lightdir, normal), 0.0, 1.0);
+}
+
 vec3 ProcessMaterialLight(Material material, vec3 color)
 {
 	vec4 dynlight = uDynLightColor;
 	vec3 normal = material.Normal;
 
+	if (normal != vec3(0.0))
+	{
+		float lightLevelContrastStrength = 0.25;
+		dynlight.rgb += color * lightLevelContrastAttenuation(normal) * lightLevelContrastStrength;
+		color *= 1.0 - lightLevelContrastStrength;
+	}
+
 	if (uLightIndex >= 0)
 	{
 		ivec4 lightRange = ivec4(lights[uLightIndex]) + ivec4(uLightIndex + 1);
diff --git a/wadsrc/static/shaders/glsl/material_pbr.fp b/wadsrc/static/shaders/glsl/material_pbr.fp
index 6859c28bbc..e0a45eb495 100644
--- a/wadsrc/static/shaders/glsl/material_pbr.fp
+++ b/wadsrc/static/shaders/glsl/material_pbr.fp
@@ -80,6 +80,36 @@ vec3 ProcessMaterialLight(Material material, vec3 ambientLight)
 
 	vec3 Lo = uDynLightColor.rgb;
 
+	if (N != vec3(0.0))
+	{
+		float lightLevelContrastStrength = 0.25;
+
+		vec3 L = vec3(0.55708601453, -0.7427813527, 0.37139067635);
+		float attenuation = clamp(dot(N, L), 0.0, 1.0);
+		if (attenuation > 0.0)
+		{
+			vec3 H = normalize(V + L);
+
+			vec3 radiance = ambientLight.rgb * attenuation * lightLevelContrastStrength;
+
+			// cook-torrance brdf
+			float NDF = DistributionGGX(N, H, roughness);
+			float G = GeometrySmith(N, V, L, roughness);
+			vec3 F = fresnelSchlick(clamp(dot(H, V), 0.0, 1.0), F0);
+
+			vec3 kS = F;
+			vec3 kD = (vec3(1.0) - kS) * (1.0 - metallic);
+
+			vec3 nominator = NDF * G * F;
+			float denominator = 4.0 * clamp(dot(N, V), 0.0, 1.0) * clamp(dot(N, L), 0.0, 1.0);
+			vec3 specular = nominator / max(denominator, 0.001);
+
+			Lo += (kD * albedo / PI + specular) * radiance;
+		}
+
+		ambientLight *= 1.0 - lightLevelContrastStrength;
+	}
+
 	if (uLightIndex >= 0)
 	{
 		ivec4 lightRange = ivec4(lights[uLightIndex]) + ivec4(uLightIndex + 1);
diff --git a/wadsrc/static/shaders/glsl/material_specular.fp b/wadsrc/static/shaders/glsl/material_specular.fp
index 60a39ab1e4..ca38f9d1b8 100644
--- a/wadsrc/static/shaders/glsl/material_specular.fp
+++ b/wadsrc/static/shaders/glsl/material_specular.fp
@@ -34,6 +34,20 @@ vec2 lightAttenuation(int i, vec3 normal, vec3 viewdir, float lightcolorA)
 	return vec2(attenuation, attenuation * specularLevel * pow(specAngle, phExp));
 }
 
+vec2 lightLevelContrastAttenuation(vec3 normal, vec3 viewdir)
+{
+	vec3 lightdir = vec3(0.55708601453, -0.7427813527, 0.37139067635);
+	float attenuation = clamp(dot(lightdir, normal), 0.0, 1.0);
+
+	float glossiness = uSpecularMaterial.x;
+	float specularLevel = uSpecularMaterial.y;
+
+	vec3 halfdir = normalize(viewdir + lightdir);
+	float specAngle = clamp(dot(halfdir, normal), 0.0f, 1.0f);
+	float phExp = glossiness * 4.0f;
+	return vec2(attenuation, attenuation * specularLevel * pow(specAngle, phExp));
+}
+
 vec3 ProcessMaterialLight(Material material, vec3 color)
 {
 	vec4 dynlight = uDynLightColor;
@@ -42,6 +56,15 @@ vec3 ProcessMaterialLight(Material material, vec3 color)
 	vec3 normal = material.Normal;
 	vec3 viewdir = normalize(uCameraPos.xyz - pixelpos.xyz);
 
+	if (normal != vec3(0.0))
+	{
+		float lightLevelContrastStrength = 0.25;
+		vec2 lightLevelAttenuation = lightLevelContrastAttenuation(normal, viewdir) * lightLevelContrastStrength;
+		dynlight.rgb += color * lightLevelAttenuation.x;
+		specular.rgb += color * lightLevelAttenuation.y;
+		color *= 1.0 - lightLevelContrastStrength;
+	}
+
 	if (uLightIndex >= 0)
 	{
 		ivec4 lightRange = ivec4(lights[uLightIndex]) + ivec4(uLightIndex + 1);