diff --git a/src/net/torvald/gdx/graphics/Cvec.kt b/src/net/torvald/gdx/graphics/Cvec.kt
index 5f6722bda..035b50452 100644
--- a/src/net/torvald/gdx/graphics/Cvec.kt
+++ b/src/net/torvald/gdx/graphics/Cvec.kt
@@ -445,6 +445,8 @@ class Cvec {
         )
     }
 
+    fun fastLum() = (3*r + 4*g + b)/8f
+
     companion object {
         val WHITE = Cvec(1f, 1f, 1f, 1f)
 
diff --git a/src/net/torvald/terrarum/modulebasegame/IngameRenderer.kt b/src/net/torvald/terrarum/modulebasegame/IngameRenderer.kt
index 375634c6a..2567198b7 100644
--- a/src/net/torvald/terrarum/modulebasegame/IngameRenderer.kt
+++ b/src/net/torvald/terrarum/modulebasegame/IngameRenderer.kt
@@ -528,14 +528,19 @@ object IngameRenderer : Disposable {
                 else
                     blendMul(batch)
 
-                batch.shader = shaderRGBOnly
-                batch.shader.setUniformi("rnd", rng.nextInt(8192), rng.nextInt(8192))
-                batch.shader.setUniformi("u_pattern", 1)
-                batch.draw(lightTex,
+//                if (!KeyToggler.isOn(Input.Keys.F9)) {
+                    batch.shader = shaderRGBOnly
+                    batch.shader.setUniformi("rnd", rng.nextInt(8192), rng.nextInt(8192))
+                    batch.shader.setUniformi("u_pattern", 1)
+                    batch.draw(
+                        lightTex,
                         xrem, yrem,
                         lightTex.regionWidth * lightmapDownsample,
                         lightTex.regionHeight * lightmapDownsample
-                )
+                    )
+//                }
+
+
 
                 // if right texture coord for lightTex and fboRGB are obtainable, you can try this:
                 /*
diff --git a/src/net/torvald/terrarum/worlddrawer/BlocksDrawer.kt b/src/net/torvald/terrarum/worlddrawer/BlocksDrawer.kt
index c8b2182af..f9e81f943 100644
--- a/src/net/torvald/terrarum/worlddrawer/BlocksDrawer.kt
+++ b/src/net/torvald/terrarum/worlddrawer/BlocksDrawer.kt
@@ -5,6 +5,7 @@ import com.badlogic.gdx.Input.Keys
 import com.badlogic.gdx.graphics.*
 import com.badlogic.gdx.math.Matrix4
 import com.jme3.math.FastMath
+import net.torvald.gdx.graphics.Cvec
 import net.torvald.terrarum.*
 import net.torvald.terrarum.App.measureDebugTime
 import net.torvald.terrarum.App.printdbg
@@ -350,7 +351,7 @@ internal object BlocksDrawer {
                             App.tileMaker.fluidToTileNumber(world.getFluid(x, y))
                         else
                             renderTag.tileNumber
-                val tileNumber = if (thisTile == Block.AIR) 0
+                var tileNumber = if (thisTile == Block.AIR) 0
                     // special case: actorblocks and F3 key
                     else if (BlockCodex.hasProp(thisTile) && BlockCodex[thisTile].isActorBlock &&
                              !BlockCodex[thisTile].hasTag("DORENDER") && !KeyToggler.isOn(Keys.F3))
@@ -367,6 +368,12 @@ internal object BlocksDrawer {
                             else -> throw IllegalArgumentException("Unknown mask type: ${renderTag.maskType}")
                         }
 
+                // hide tiles with super low lights, kinda like Minecraft's Orebfuscator
+                val lightAtXY = LightmapRenderer.getLight(x, y) ?: Cvec(0)
+                if (lightAtXY.fastLum() <= 2f / 255f) {
+                    tileNumber = 2 // black solid
+                }
+
                 var thisTileX = tileNumber % App.tileMaker.TILES_IN_X
                 var thisTileY = tileNumber / App.tileMaker.TILES_IN_X