diff --git a/c1k3-assets b/c1k3-assets
index 7d2251e..f7c814d 160000
--- a/c1k3-assets
+++ b/c1k3-assets
@@ -1 +1 @@
-Subproject commit 7d2251eae1f15292976067aff58f371a6381046e
+Subproject commit f7c814ddb767627820e47710c2592e7ff9aa8b28
diff --git a/main.c b/main.c
index ad6ee55..496444b 100644
--- a/main.c
+++ b/main.c
@@ -211,7 +211,7 @@ int main(int argc, char* argv[]) {
         return 1;
     }
     SDL_GL_CreateContext(window);
-    // SDL_GL_SetSwapInterval(0);
+    SDL_GL_SetSwapInterval(0);
     // todo, vsync?
 
     game_load();
diff --git a/shader.frag b/shader.frag
index 5e69958..443b49e 100644
--- a/shader.frag
+++ b/shader.frag
@@ -21,14 +21,12 @@
 		// Calculate all lights
 		"vec3 vl = vec3(0,0,0);"
 		"for(int i=0;i<light_count;i+=2) {"
-			"vl+="
-				// Angle to normal
-				"max("
-					"dot("
-						"vn, normalize(l[i]-vp)"
-					")"
-				",0.)*" 
-				"(1./pow(length(l[i]-vp),2.))" // Inverse distance squared
+			"vec3 livp = l[i]-vp;"
+			"float c_len = length(livp);"
+			"float c_dot = dot(vn, normalize(livp));"
+			"if ( c_len > 1024. || c_dot < 0.) { continue; }"
+			"vl+= c_dot *" 
+				"(1./pow(c_len,2.))" // Inverse distance squared
 				"*l[i+1];" // Light color/intensity
 		"}"