fixed stuck pixels

fixed fall speed
improved naming

Scripts/Elements/Element.cs

@@ -88,13 +88,13 @@ public class Element{
         else if (Chunk.IsEmpty(Position + randomDirection * VERTICAL_OPPOSITE))
             Chunk.Swap(this, Position + randomDirection * VERTICAL_OPPOSITE);
 
-        if (GD.Randi() % MAX_DIFFUSE_SPEED > DiffuseSpeed) return; // descend slower
-
-        if (Chunk.Get(Position + randomDirection)?.Density < Density)
+        // density check
+        if (Chunk.Get(Position + Vector2I.Down)?.Density < Density)
             Chunk.Swap(this, Position + Vector2I.Down);
+        else if (Chunk.Get(Position + Vector2I.Down + randomDirection)?.Density < Density)
+            Chunk.Swap(this, Position + Vector2I.Down + randomDirection);
     }
 
-    /// <returns>-1, 0 or 1</returns>
     protected Vector2I RandomDirectionDown() {
         int randomDirection = GD.Randi() % 2 != 0 ? 1 : -1;
 
@@ -102,6 +102,13 @@ public class Element{
             + (GD.Randi() % 2 != 0 ? Vector2I.Zero : Vector2I.Right * randomDirection);
     }
 
+    /// <returns>-1, 0 or 1</returns>
+    protected Vector2I RandomDirection() {
+        int randomDirection = GD.Randi() % 2 != 0 ? 1 : -1;
+
+        return (GD.Randi() % 2 != 0 ? Vector2I.Zero : Vector2I.Right * randomDirection);
+    }
+
     protected Color AddColorVariance(Color baseColor) {
         Color c = baseColor;
         c.R += (GD.Randf() - 1) * MAX_COLOR_VARIANCE;
@@ -128,7 +135,7 @@ public class Element{
         MarkForUpdate();
     }
 
-    public bool MarkedForUpdate() {
+    public bool IsMarkedForUpdate() {
         return markedForUpdate;
     }
 

Scripts/Level.cs

@@ -30,7 +30,7 @@ public class Level {
 
         GD.Print($"Generating level ({sizeX}:{sizeY}) with {chunksPerX*chunksPerY} chunks ({chunkResX} * {chunkResY})");
 
-        image = Image.Create(sizeX, sizeY, false, Image.Format.Rgb8);
+        image = Image.CreateEmpty(sizeX, sizeY, false, Image.Format.Rgb8);
 
         chunks = new Chunk[chunksPerX, chunksPerY];
         int index = 0;
@@ -165,7 +165,7 @@ public class Level {
                     for (int y = 0; y < chunkResY; y++) {
                         // TODO: multithreading here! use Chunk.DrawLevel() and stitch images together
 
-                        if (chunks[cx, cy].Elements[x, y].MarkedForUpdate()) {
+                        if (chunks[cx, cy].Elements[x, y].IsMarkedForUpdate()) {
                             image.SetPixel(cx * chunkResX + x, cy * chunkResY + y, chunks[cx, cy].Elements[x, y].Color);
                             chunks[cx, cy].Elements[x, y].MarkForUpdate(false);
                         }

Scripts/Main.cs

@@ -36,10 +36,10 @@ public partial class Main : Node2D {
 
 	public override void _PhysicsProcess(double delta) {
 		base._PhysicsProcess(delta);
-		Level.Update();
 	}
 
 	public override void _Process(double delta) {
+		Level.Update();
 		mLevelDrawer.Texture?.Dispose();
 		mLevelDrawer.Texture = ImageTexture.CreateFromImage(Level.DrawLevel());
 	}