Share some interesting things 
really like your shader, and I’m trying to integrate it with a regular scene. The goal is to make them visually consistent within the same lighting environment (previously I set up lighting channels to make them work together) and under the condition that Lumen is enabled.
Increase the direct light for other shading models in DeferredLightPixelShaders.usf.
#endif // USE_ADAPTIVE_VOLUMETRIC_SHADOW_MAP
float4 Radiance = GetDynamicLighting(DerivedParams.TranslatedWorldPosition, DerivedParams.CameraVector, ScreenSpaceData.GBuffer, ScreenSpaceData.AmbientOcclusion, LightData, LightAttenuation, Dither, uint2(InputParams.PixelPos), SurfaceShadow);
if (ScreenSpaceData.GBuffer.ShadingModelID != SHADINGMODELID_CLEAR_COAT)
{
Radiance*=4;//Multiplying directly seems a bit reckless?
}
OutColor += Radiance;
#endif // SUBTRATE_GBUFFER_FORMAT==1
Exclude the Lumen ambient light received by SelShader in DiffuseIndirectComposite.usf.
// Accumulate lighting into the final buffers
#if SUBTRATE_GBUFFER_FORMAT==0
if (Material.GBufferData.ShadingModelID != SHADINGMODELID_CLEAR_COAT)
{
IndirectLighting.Specular *= GetSSSCheckerboadSpecularScale(PixelPos, Material.bNeedsSeparateLightAccumulation);
FLightAccumulator LightAccumulator = (FLightAccumulator)0;
LightAccumulator_Add(
LightAccumulator,
IndirectLighting.Diffuse + IndirectLighting.Specular,
IndirectLighting.Diffuse,
1.0f,
Material.bNeedsSeparateLightAccumulation);
OutAddColor = LightAccumulator_GetResult(LightAccumulator);
}
#endif // SUBTRATE_GBUFFER_FORMAT==0
Under the same directional light source, they no longer appear visually separated:
Now, with exposure turned off and light intensity set to 1, they no longer appear to be from two different worlds.
This is what I got:
Ordinary objects can receive Lumen ambient light from the SelShader
Use FaceMap in unreal engine 
：
Just look at the changes in facial shadows
Facemap looks like this:
// ==== Inputs ====
// Input(0): LightDir (float3) - 世界空间下的太阳方向（指向光线方向）
// Input(2): UV (float2) - 原始纹理UV
// Input(3): OffsetAngle (float) - 角度偏移值（弧度）
// ==== Output ====
// float3(x: 新UV.x, y: 新UV.y, z: 输出值)
// 预定义常量
static const float EPSILON = 1e-6f;
static const float HALF_PI = 1.5708f;
static const float TWO_PI = 6.283185307f;
// --- 1. 物体旋转计算 ---
float3x3 WtoL = LWCToFloat(GetPrimitiveData(Parameters.PrimitiveId).WorldToLocal);
// 使用更快的长度计算并避免分支
float sy_sq = WtoL[0][0] * WtoL[0][0] + WtoL[1][0] * WtoL[1][0];
float sy = sqrt(sy_sq);
// 直接计算偏航角，避免完整欧拉角转换
float Yaw = (sy_sq < EPSILON * EPSILON) ? 0.0f : atan2(WtoL[1][0], WtoL[0][0]);
// 角度规范化
Yaw = fmod(fmod(Yaw, TWO_PI) + TWO_PI, TWO_PI);
// --- 2. 太阳方向计算 ---
// 假设LightDir已归一化，直接使用xy分量
float3 SunDir = float3(-LightDir.x, -LightDir.y, 0.0f);
// --- 3. 角度计算---
float cosYaw, sinYaw;
sincos(Yaw, sinYaw, cosYaw);
// 直接计算点积和叉积
float dotVal = cosYaw * SunDir.x + sinYaw * SunDir.y;
float crossVal = cosYaw * SunDir.y - sinYaw * SunDir.x;
// 计算角度并应用偏移
float angle = atan2(crossVal, dotVal) + OffsetAngle + HALF_PI;
// --- 4. 输出值计算 ---
float sinAngle, cosAngle;
sincos(angle, sinAngle, cosAngle);
float value = mad(-0.5f, cosAngle, 0.5f);
// --- 5. UV翻转 ---
float2 NewUV = float2(
lerp(UV.x, 1.0f - UV.x, sinAngle > 0.0f),
UV.y
);
// --- 6. 输出结果 ---
return float3(NewUV, value);
@Envieous Is it possible to show a transition area at the boundary between light and dark areas?
