diff --git a/core/assets/shaders/slag.frag b/core/assets/shaders/slag.frag
index 50bdcfd879..5b87b982ab 100755
--- a/core/assets/shaders/slag.frag
+++ b/core/assets/shaders/slag.frag
@@ -6,7 +6,7 @@ precision mediump int;
 //shades of slag
 #define S2 vec3(100.0, 93.0, 49.0) / 100.0
 #define S1 vec3(100.0, 60.0, 25.0) / 100.0
-#define NSCALE 280.0 / 2.0
+#define NSCALE 200.0 / 2.0
 
 uniform sampler2D u_texture;
 uniform sampler2D u_noise;
@@ -24,13 +24,15 @@ void main(){
 
     float btime = u_time / 4000.0;
     float noise = (texture2D(u_noise, (coords) / NSCALE + vec2(btime) * vec2(-0.9, 0.8)).r + texture2D(u_noise, (coords) / NSCALE + vec2(btime * 1.1) * vec2(0.8, -1.0)).r) / 2.0;
-    vec3 color = texture2D(u_texture, c).rgb;
+    vec4 color = texture2D(u_texture, c);
 
-    if(noise > 0.6){
-        color = S2;
-    }else if(noise > 0.54){
-        color = S1;
+    if(color.a > 0.1){
+        if(noise > 0.6){
+            color.rgb = S2;
+        }else if (noise > 0.54){
+            color.rgb = S1;
+        }
     }
 
-    gl_FragColor = vec4(color.rgb, 1.0);
+    gl_FragColor = color;
 }
\ No newline at end of file
diff --git a/core/assets/shaders/tar.frag b/core/assets/shaders/tar.frag
index db5009141a..4ca0e7be97 100644
--- a/core/assets/shaders/tar.frag
+++ b/core/assets/shaders/tar.frag
@@ -21,11 +21,11 @@ void main(){
 
     float btime = u_time / 8000.0;
     float noise = (texture2D(u_noise, (coords) / NSCALE + vec2(btime) * vec2(-0.9, 0.8)).r + texture2D(u_noise, (coords) / NSCALE + vec2(btime * 1.1) * vec2(-0.8, -1.0)).r) / 2.0;
-    vec3 color = texture2D(u_texture, c).rgb;
+    vec4 color = texture2D(u_texture, c);
 
     if(!(noise > 0.54 && noise < 0.58)){
-        color *= 0.6;
+        color.rgb *= 0.6;
     }
 
-    gl_FragColor = vec4(color.rgb, 1.0);
+    gl_FragColor = color;
 }
\ No newline at end of file
diff --git a/core/src/mindustry/graphics/CacheLayer.java b/core/src/mindustry/graphics/CacheLayer.java
index ab354acf1f..6363efae98 100644
--- a/core/src/mindustry/graphics/CacheLayer.java
+++ b/core/src/mindustry/graphics/CacheLayer.java
@@ -8,7 +8,6 @@ import arc.graphics.gl.*;
 import static mindustry.Vars.renderer;
 
 public enum CacheLayer{
-    //TODO water animation breaks when tar/slag is present
     water{
         @Override
         public void begin(){
diff --git a/core/src/mindustry/graphics/Layer.java b/core/src/mindustry/graphics/Layer.java
index 8c223113d2..d6d07d6c5f 100644
--- a/core/src/mindustry/graphics/Layer.java
+++ b/core/src/mindustry/graphics/Layer.java
@@ -23,7 +23,7 @@ public class Layer{
     //things drawn over blocks (intermediate layer)
     blockOver = 35,
 
-    //blocks currently in progress *shaders used* TODO perhaps put shaders into their own category
+    //blocks currently in progress *shaders used*
     blockBuilding = 40,
 
     //ground units
diff --git a/core/src/mindustry/graphics/MinimapRenderer.java b/core/src/mindustry/graphics/MinimapRenderer.java
index 8cc4f981f2..0d6d0df1b5 100644
--- a/core/src/mindustry/graphics/MinimapRenderer.java
+++ b/core/src/mindustry/graphics/MinimapRenderer.java
@@ -135,6 +135,8 @@ public class MinimapRenderer implements Disposable{
     }
 
     public void update(Tile tile){
+        if(world.isGenerating()) return;
+
         int color = colorFor(world.tile(tile.x, tile.y));
         pixmap.draw(tile.x, pixmap.getHeight() - 1 - tile.y, color);