A collection of helpers for Terrain math with Unity

TerrainMath.cs

		public static class TerrainMath{
			
			/**
	       * Gets the XBase and width based on bounds input
	       * @param portalBounds The bounds of the Box collider to use
	       * @param terrainBounds The bounds of the terrain collider to use
	       * @return Vector2 Where X is the XBase and Y is the Width
	       * @static
	       */
			public static Vector2 GetXBaseAndWidth(Bounds portalBounds, Bounds terrainBounds){
				float xbase,width;
				if(portalBounds.min.x<terrainBounds.min.x){
					xbase=terrainBounds.min.x;
					width=portalBounds.size.x-(terrainBounds.min.x-portalBounds.min.x);
				}else if(portalBounds.max.x>terrainBounds.max.x){
					xbase=portalBounds.min.x;
					width=portalBounds.size.x-(portalBounds.max.x-terrainBounds.max.x);
				}else{
					xbase=portalBounds.min.x;
					width=portalBounds.size.x;
				}
				
				return new Vector2(xbase,width);
			}
			
			/**
	       * Gets the ZBase and height based on bounds input
	       * @param portalBounds The bounds of the Box collider to use
	       * @param terrainBounds The bounds of the terrain collider to use
	       * @return Vector2 Where X is the ZBase and Y is the Height
	       * @static
	       */
			public static Vector2 GetZBaseAndHeight(Bounds portalBounds, Bounds terrainBounds){
				float zbase,height;
				if(portalBounds.min.z<terrainBounds.min.z){
					zbase=terrainBounds.min.z;
					height=portalBounds.size.z-(terrainBounds.min.z-portalBounds.min.z);
				}else if(portalBounds.max.z>terrainBounds.max.z){
					zbase=portalBounds.min.z;
					height=portalBounds.size.z-(portalBounds.max.z-terrainBounds.max.z);
				}else{
					zbase=portalBounds.min.z;
					height=portalBounds.size.z;
				}
				return new Vector2(zbase,height);
			}
			
			/**
	       * Converts and X coordinate in world space to a terrain coordinate X
	       * @param XPositionToConvert The X position in world space to convert
	       * @param TerrainToUse The terrain to convert the X position to
	       * @return int The converted position
	       * @static
	       */
			public static int ConvertXPositionToTerrainCoordinates(float XPositionToConvert, Terrain TerrainToUse){
				float terraincoordinate = (XPositionToConvert-TerrainToUse.transform.position.x)/TerrainToUse.terrainData.size.x;
				return (int)(terraincoordinate*TerrainToUse.terrainData.heightmapWidth);
			}
			
			/**
	       * Converts and Z coordinate in world space to a terrain coordinate Z
	       * @param ZPositionToConvert The Z position in world space to convert
	       * @param TerrainToUse The terrain to convert the Z position to
	       * @return int The converted position
	       * @static
	       */
			public static int ConvertZPositionToTerrainCoordinates(float ZPositionToConvert, Terrain TerrainToUse){
				float terraincoordinate = (ZPositionToConvert-TerrainToUse.transform.position.z)/TerrainToUse.terrainData.size.z;
				return (int)(terraincoordinate*TerrainToUse.terrainData.heightmapHeight);
			}
		}