Changes to support coordinate system that use units other than meters.

Obj2Tiles.Test/StagesTests.cs

@@ -47,7 +47,7 @@ public void TilingStage_Tile()
                 Name = Path.GetFileNameWithoutExtension(file)
             }).ToDictionary(item => item.Name, item => item.Bounds);
 
-        StagesFacade.Tile("TestData/Tile1", testPath, 1, new[] { boundsMapper });
+        StagesFacade.Tile("TestData/Tile1", testPath, 1, 100, new[] { boundsMapper });
 
     }
 

Obj2Tiles/Options.cs

@@ -34,6 +34,12 @@ public sealed class Options
 
     [Option("alt", Required = false, HelpText = "Altitude of the mesh (meters)", Default = 0)]
     public double Altitude { get; set; }
+
+    [Option("scale", Required = false, HelpText = "Scale for data if using units other than meters ( 1200.0/3937.0 for survey ft)", Default = 1.0)]
+    public double Scale { get; set; }
+
+    [Option('e',"error", Required = false, HelpText = "Base error for root node", Default = 100.0)]
+    public double BaseError { get; set; }
 
     [Option("use-system-temp", Required = false, HelpText = "Uses the system temp folder", Default = false)]
     public bool UseSystemTempFolder { get; set; }

Obj2Tiles/Program.cs

@@ -82,15 +82,20 @@ private static async Task Run(Options opts)
                     return;
 
                 var gpsCoords = opts.Latitude != null && opts.Longitude != null
-                    ? new GpsCoords(opts.Latitude.Value, opts.Longitude.Value, opts.Altitude)
+                    ? new GpsCoords(opts.Latitude.Value, opts.Longitude.Value, opts.Altitude, opts.Scale)
                     : null;
 
                 Console.WriteLine();
                 Console.WriteLine($" => Tiling stage {(gpsCoords != null ? $"with GPS coords {gpsCoords}" : "")}");
 
+                var baseError = opts.BaseError;
+
+                Console.WriteLine();
+                Console.WriteLine($" => Tiling stage with baseError {baseError}");
+
                 sw.Restart();
 
-                StagesFacade.Tile(destFolderSplit, opts.Output, opts.LODs, boundsMapper, gpsCoords);
+                StagesFacade.Tile(destFolderSplit, opts.Output, opts.LODs, opts.BaseError, boundsMapper, gpsCoords);
 
                 Console.WriteLine(" ?> Tiling stage done in {0}", sw.Elapsed);
             }

Obj2Tiles/Stages/Model/GpsCoords.cs

@@ -5,32 +5,36 @@ public class GpsCoords
     public double Latitude { get; set; }
     public double Longitude { get; set; }
     public double Altitude { get; set; }
+    public double Scale { get; set; }
 
-    public GpsCoords(double latitude, double longitude, double altitude)
+    public GpsCoords(double latitude, double longitude, double altitude, double scale)
     {
         Latitude = latitude;
         Longitude = longitude;
         Altitude = altitude;
+        Scale = scale;
     }
 
     public GpsCoords()
     {
         Latitude = 0;
         Longitude = 0;
         Altitude = 0;
+        Scale = 1;
     }
 
     public double[] ToEcefTransform()
     {
+        var s = Scale;
         var lat = Latitude * Math.PI / 180;
         var lon = Longitude * Math.PI / 180;
         var alt = Altitude;
 
-        const double a = 6378137;
-        const double b = 6356752.3142;
-        const double f = (a - b) / a;
+        var a = 6378137.0/s;
+        var b = 6356752.3142/s;
+        var f = (a - b) / a;
 
-        const double eSq = 2 * f - f * f;
+        var eSq = 2 * f - f * f;
 
         var sinLat = Math.Sin(lat);
         var cosLat = Math.Cos(lat);
@@ -63,9 +67,17 @@ public double[] ToEcefTransform()
             0, 0, 0, 1
         };
 
+        var scale = new double[]
+        {
+            s, 0, 0, 0,
+            0, s, 0, 0,
+            0, 0, s, 0,
+            0, 0, 0, 1
+        };
+
         var mult = MultiplyMatrix(res, rot);
 
-        return ConvertToColumnMajorOrder(mult);
+        return MultiplyMatrix(ConvertToColumnMajorOrder(mult), scale);
     }
 
     public static readonly double[] rot = {
@@ -112,6 +124,6 @@ public static double[] MultiplyMatrix(double[] m1, double[] m2)
 
     public override string ToString()
     {
-        return $"{Latitude}, {Longitude}, {Altitude}";
+        return $"{Latitude}, {Longitude}, {Altitude}, {Scale}";
     }
 }

Obj2Tiles/Stages/TilingStage.cs

@@ -11,7 +11,7 @@ namespace Obj2Tiles.Stages;
 
 public static partial class StagesFacade
 {
-    public static void Tile(string sourcePath, string destPath, int lods, Dictionary<string, Box3>[] boundsMapper,
+    public static void Tile(string sourcePath, string destPath, int lods, double baseError, Dictionary<string, Box3>[] boundsMapper,
         GpsCoords? coords = null)
     {
 
@@ -29,7 +29,7 @@ public static void Tile(string sourcePath, string destPath, int lods, Dictionary
 
         // Don't ask me why 100, I have no idea but it works
         // https://github.com/CesiumGS/3d-tiles/issues/162
-        const int baseError = 100;
+        //const int baseError = 100;
 
         // Generate tileset.json
         var tileset = new Tileset

README.md

@@ -32,6 +32,8 @@ You can download precompiled binaries for Windows, Linux and macOS from https://
   --lat                  Latitude of the mesh
   --lon                  Longitude of the mesh
   --alt                  (Default: 0) Altitude of the mesh (meters)
+  -e, --error            (Default: 100), baseError value for root node
+  --scale                (Default: 1), scale for data if using units other than meters ( 1200.0/3937.0 for survey ft)  
 
   --use-system-temp      (Default: false) Uses the system temp folder
   --keep-intermediate    (Default: false) Keeps the intermediate files (do not cleanup)