diff --git a/src/common/rendering/hwrenderer/data/hw_viewpointuniforms.h b/src/common/rendering/hwrenderer/data/hw_viewpointuniforms.h
index 086d49cf2..58668d563 100644
--- a/src/common/rendering/hwrenderer/data/hw_viewpointuniforms.h
+++ b/src/common/rendering/hwrenderer/data/hw_viewpointuniforms.h
@@ -40,6 +40,8 @@ struct HWViewpointUniforms
 
 	int mLightTilesWidth = 0;
 
+	FVector3 mCameraNormal;
+
 	void CalcDependencies()
 	{
 		mNormalViewMatrix.computeNormalMatrix(mViewMatrix);
diff --git a/src/common/utility/vectors.h b/src/common/utility/vectors.h
index 47eb59793..e13fcea40 100644
--- a/src/common/utility/vectors.h
+++ b/src/common/utility/vectors.h
@@ -710,6 +710,13 @@ struct TVector3
 		*this = *this ^ other;
 		return *this;
 	}
+
+
+	// returns a version with swapped Z/Y
+	constexpr const TVector3 ToXZY() const
+	{
+		return {X, Z, Y};
+	}
 };
 
 template<class vec_t>
diff --git a/src/rendering/hwrenderer/scene/hw_drawinfo.cpp b/src/rendering/hwrenderer/scene/hw_drawinfo.cpp
index c0e8016bf..cc2dd8207 100644
--- a/src/rendering/hwrenderer/scene/hw_drawinfo.cpp
+++ b/src/rendering/hwrenderer/scene/hw_drawinfo.cpp
@@ -356,6 +356,10 @@ void HWDrawInfo::SetViewMatrix(const FRotator &angles, float vx, float vy, float
 	VPUniforms.mViewMatrix.rotate(angles.Yaw.Degrees(), 0.0f, mult, 0.0f);
 	VPUniforms.mViewMatrix.translate(vx * mult, -vz * planemult, -vy);
 	VPUniforms.mViewMatrix.scale(-mult, planemult, 1);
+
+	FRotator unfuckedAngles(angles.Pitch, FAngle::fromDeg(90 - angles.Yaw.Degrees()), angles.Roll);
+
+	VPUniforms.mCameraNormal = FVector3(unfuckedAngles).ToXZY();
 }
 
 
diff --git a/wadsrc/static/shaders/scene/binding_rsbuffers.glsl b/wadsrc/static/shaders/scene/binding_rsbuffers.glsl
index 1ef772200..2f2913c2b 100644
--- a/wadsrc/static/shaders/scene/binding_rsbuffers.glsl
+++ b/wadsrc/static/shaders/scene/binding_rsbuffers.glsl
@@ -18,6 +18,8 @@ layout(set = 1, binding = 0, std140) uniform readonly ViewpointUBO
 	float uClipHeightDirection;
 
 	int uLightTilesWidth;	// Levelmesh light tiles
+
+	vec3 uCameraNormal;
 };
 
 layout(set = 1, binding = 1, std140) uniform readonly MatricesUBO