more specific exceptions

DUI3-DX/Converters/ArcGIS/Speckle.Converters.ArcGIS3/Geometry/ISpeckleObjectToHost/ArcToHostConverter.cs

@@ -24,10 +24,10 @@ public ArcToHostConverter(
   public ACG.Polyline Convert(SOG.Arc target)
   {
     if (
-      target.plane.normal.x != 0 || target.plane.normal.y != 0 || target.plane.xdir.z != 0 || target.plane.ydir.z != 0
+      target.startPoint.z != target.midPoint.z || target.startPoint.z != target.endPoint.z 
     )
     {
-      throw new ArgumentException("Only 2d-Arc shape is supported");
+      throw new ArgumentException("Only Arc in XY plane are supported");
     }
     ACG.MapPoint fromPt = _pointConverter.Convert(target.startPoint);
     ACG.MapPoint toPt = _pointConverter.Convert(target.endPoint);

DUI3-DX/Converters/ArcGIS/Speckle.Converters.ArcGIS3/Geometry/ISpeckleObjectToHost/CircleToHostConverter.cs

@@ -32,7 +32,7 @@ public ACG.Polyline Convert(SOG.Circle target)
       target.plane.normal.x != 0 || target.plane.normal.y != 0 || target.plane.xdir.z != 0 || target.plane.ydir.z != 0
     )
     {
-      throw new ArgumentException("Only 2d-Circle shape is supported");
+      throw new ArgumentException("Only Circles in XY plane are supported");
     }
 
     // create a native ArcGIS circle segment

DUI3-DX/Converters/ArcGIS/Speckle.Converters.ArcGIS3/Geometry/ISpeckleObjectToHost/EllipseToHostConverter.cs

@@ -27,35 +27,35 @@ public ACG.Polyline Convert(SOG.Ellipse target)
     // dummy check
     if (target.firstRadius == null || target.secondRadius == null)
     {
-      throw new ArgumentException("Invalid Ellipse provided");
+      throw new ArgumentException("Ellipse is missing the first or second radius");
     }
     if (
       target.plane.normal.x != 0 || target.plane.normal.y != 0 || target.plane.xdir.z != 0 || target.plane.ydir.z != 0
     )
     {
-      throw new ArgumentException("Only 2d-Ellipse shape is supported");
+      throw new ArgumentException("Only Ellipses in XY plane are supported");
     }
 
     ACG.MapPoint centerPt = _pointConverter.Convert(target.plane.origin);
     double scaleFactor = Units.GetConversionFactor(target.units, _contextStack.Current.SpeckleUnits);
 
     // set default values
     double angle = Math.Atan2(target.plane.xdir.y, target.plane.xdir.x);
-    double majorAxeRadius = (double)target.firstRadius;
-    double minorAxisRatio = (double)target.secondRadius / majorAxeRadius;
+    double majorAxisRadius = (double)target.firstRadius;
+    double minorAxisRatio = (double)target.secondRadius / majorAxisRadius;
 
     // adjust if needed
     if (minorAxisRatio > 1)
     {
-      majorAxeRadius = (double)target.secondRadius;
+      majorAxisRadius = (double)target.secondRadius;
       minorAxisRatio = 1 / minorAxisRatio;
       angle += Math.PI / 2;
     }
 
     ACG.EllipticArcSegment segment = ACG.EllipticArcBuilderEx.CreateEllipse(
       new ACG.Coordinate2D(centerPt),
       angle,
-      majorAxeRadius * scaleFactor,
+      majorAxisRadius * scaleFactor,
       minorAxisRatio,
       ACG.ArcOrientation.ArcCounterClockwise,
       _contextStack.Current.Document.Map.SpatialReference