[TASK] Initial commit with basic product setup

Assets/Mapbox SDK/Mapbox/Unity/MeshGeneration/Modifiers/MeshModifiers/SnapTerrainRaycastModifier.cs

@@ -0,0 +1,54 @@
+namespace Mapbox.Unity.MeshGeneration.Modifiers
+{
+	using Mapbox.Unity.Map;
+	using Mapbox.Unity.MeshGeneration.Data;
+	using UnityEngine;
+
+	[CreateAssetMenu(menuName = "Mapbox/Modifiers/Snap Terrain Raycast Modifier")]
+	public class SnapTerrainRaycastModifier : MeshModifier
+	{
+		private const int RAY_LENGTH = 50;
+
+		[SerializeField]
+		private LayerMask _terrainMask;
+		private double scaledX;
+		private double scaledY;
+
+		public override ModifierType Type
+		{
+			get { return ModifierType.Preprocess; }
+		}
+
+		public override void Run(VectorFeatureUnity feature, MeshData md, UnityTile tile = null)
+		{
+			scaledX = tile.Rect.Size.x * tile.TileScale;
+			scaledY = tile.Rect.Size.y * tile.TileScale;
+
+			foreach (var sub in feature.Points)
+			{
+				for (int i = 0; i < sub.Count; i++)
+				{
+					var h = tile.QueryHeightData((float)((sub[i].x + md.PositionInTile.x + scaledX / 2) / scaledX), (float)((sub[i].z + md.PositionInTile.z + scaledY / 2) / scaledY));
+
+					RaycastHit hit;
+					Vector3 rayCenter =
+						new Vector3(sub[i].x + md.PositionInTile.x + tile.transform.position.x,
+							h + RAY_LENGTH / 2,
+							sub[i].z + md.PositionInTile.z + tile.transform.position.z);
+
+
+
+					if (Physics.Raycast(rayCenter, Vector3.down, out hit, RAY_LENGTH * 5, _terrainMask))
+					{
+						sub[i] += new Vector3(0, hit.point.y + md.PositionInTile.y - tile.transform.position.y, 0);
+					}
+					else
+					{
+						// Raycasting sometimes fails at terrain boundaries, fallback to tile height data.
+						sub[i] += new Vector3(0, h, 0);
+					}
+				}
+			}
+		}
+	}
+}