diff --git a/src/lightmapper/glsl/trace_light.glsl.h b/src/lightmapper/glsl/trace_light.glsl.h
index 20800d6..b36b94a 100644
--- a/src/lightmapper/glsl/trace_light.glsl.h
+++ b/src/lightmapper/glsl/trace_light.glsl.h
@@ -71,8 +71,8 @@ vec4 TracePointLightRay(vec3 origin, vec3 lightpos, float tmin, vec4 rayColor)
 		// Blend with surface texture
 		rayColor = BlendTexture(surface, GetSurfaceUV(result.primitiveIndex, result.primitiveWeights), rayColor);
 
-		// Stop if it isn't a portal, or there is no light left
-		if (surface.PortalIndex == 0 || rayColor.r + rayColor.g + rayColor.b <= 0.0)
+		// Stop if there is no light left
+		if (rayColor.r + rayColor.g + rayColor.b <= 0.0)
 			return vec4(0.0);
 
 		// Move to surface hit point
diff --git a/src/lightmapper/glsl/trace_sunlight.glsl.h b/src/lightmapper/glsl/trace_sunlight.glsl.h
index 4febd86..e7cc26c 100644
--- a/src/lightmapper/glsl/trace_sunlight.glsl.h
+++ b/src/lightmapper/glsl/trace_sunlight.glsl.h
@@ -54,12 +54,16 @@ vec4 TraceSunRay(vec3 origin, float tmin, vec3 dir, float tmax, vec4 rayColor)
 
 		SurfaceInfo surface = GetSurface(result.primitiveIndex);
 
+		// Stop if we hit the sky.
+		if (surface.Sky > 0.0)
+			return rayColor;
+
 		// Blend with surface texture
 		rayColor = BlendTexture(surface, GetSurfaceUV(result.primitiveIndex, result.primitiveWeights), rayColor);
 
-		// Stop if it isn't a portal, or there is no light left
-		if (surface.PortalIndex == 0 || rayColor.r + rayColor.g + rayColor.b <= 0.0)
-			return rayColor * surface.Sky;
+		// Stop if there is no light left
+		if (rayColor.r + rayColor.g + rayColor.b <= 0.0)
+			return vec4(0.0);
 
 		// Move to surface hit point
 		origin += dir * result.t;