Tilemaps.Components.StaggeredTileToWorldY is a new function that converts a staggered Y coordinate to a world coordinate.

src/tilemaps/components/StaggeredTileToWorldY.js

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+/**
+ * @author       Richard Davey <rich@photonstorm.com>
+ * @copyright    2020 Photon Storm Ltd.
+ * @license      {@link https://opensource.org/licenses/MIT|MIT License}
+ */
+
+/**
+ * Converts from staggered tile Y coordinates (tile units) to world Y coordinates (pixels), factoring in the
+ * layers position, scale and scroll.
+ *
+ * @function Phaser.Tilemaps.Components.StaggeredTileToWorldY
+ * @since 3.50.0
+ *
+ * @param {integer} tileY - The y coordinate, in tiles, not pixels.
+ * @param {Phaser.Cameras.Scene2D.Camera} [camera=main camera] - The Camera to use when calculating the tile index from the world values.
+ * @param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon.
+ *
+ * @return {number} The Y location in world coordinates.
+ */
+var StaggeredTileToWorldY = function (tileY, camera, layer)
+{
+    var tileHeight = layer.baseTileHeight;
+    var tilemapLayer = layer.tilemapLayer;
+    var layerWorldY = 0;
+
+    if (tilemapLayer)
+    {
+        if (camera === undefined) { camera = tilemapLayer.scene.cameras.main; }
+
+        layerWorldY = (tilemapLayer.y + camera.scrollY * (1 - tilemapLayer.scrollFactorY));
+
+        tileHeight *= tilemapLayer.scaleY;
+    }
+
+    return layerWorldY + tileY * (tileHeight / 2);
+};
+
+module.exports = StaggeredTileToWorldY;