add Axis class and rearrange utils dir

thermion_dart/lib/src/utils/src/axis.dart

@@ -0,0 +1,44 @@
+import 'dart:typed_data';
+
+import 'package:vector_math/vector_math_64.dart';
+
+import '../../viewer/viewer.dart';
+
+class Axis {
+  final ThermionViewer _viewer;
+  final ThermionEntity xAxis;
+  final ThermionEntity yAxis;
+  final ThermionEntity zAxis;
+
+  Axis._(this.xAxis, this.yAxis, this.zAxis, this._viewer);
+
+  static Future<Axis> create(ThermionViewer viewer) async {
+    final xAxis = await viewer!.createGeometry(
+        Geometry(Float32List.fromList([0, 0, 0, 10, 0, 0]), [0, 1],
+            primitiveType: PrimitiveType.LINES),
+        materialInstance: await viewer!.createUnlitMaterialInstance());
+    final yAxis = await viewer!.createGeometry(
+        Geometry(Float32List.fromList([0, 0, 0, 0, 10, 0]), [0, 1],
+            primitiveType: PrimitiveType.LINES),
+        materialInstance: await viewer!.createUnlitMaterialInstance());
+    final zAxis = await viewer!.createGeometry(
+        Geometry(Float32List.fromList([0, 0, 0, 0, 0, 10]), [0, 1],
+            primitiveType: PrimitiveType.LINES),
+        materialInstance: await viewer!.createUnlitMaterialInstance());
+
+    await viewer!.setMaterialPropertyFloat4(
+        xAxis, "baseColorFactor", 0, 1.0, 0.0, 0.0, 1.0);
+    await viewer!.setMaterialPropertyFloat4(
+        yAxis, "baseColorFactor", 0, 0.0, 1.0, 0.0, 1.0);
+    await viewer!.setMaterialPropertyFloat4(
+        zAxis, "baseColorFactor", 0, 0.0, 0.0, 1.0, 1.0);
+    return Axis._(xAxis, yAxis, zAxis, viewer);
+  }
+
+  Future setTransform(Matrix4 transform) async {
+    await _viewer.setTransform(xAxis, transform);
+    await _viewer.setTransform(yAxis, transform);
+    await _viewer.setTransform(zAxis, transform);
+    
+  }
+}

thermion_dart/lib/src/utils/src/dart_resources.dart

@@ -3,7 +3,7 @@ import 'dart:io';
 
 import 'package:ffi/ffi.dart';
 
-import '../viewer/src/ffi/src/thermion_dart.g.dart';
+import '../../viewer/src/ffi/src/thermion_dart.g.dart';
 
 class DartResourceLoader {
   static final _assets = <int, Pointer>{};

thermion_dart/lib/src/utils/src/geometry.dart

@@ -1,7 +1,7 @@
 import 'dart:math';
 import 'dart:typed_data';
 
-import '../../thermion_dart.dart';
+import '../../../thermion_dart.dart';
 
 class GeometryHelper {
   static Geometry sphere({bool normals = true, bool uvs = true}) {

thermion_dart/lib/src/utils/utils.dart

@@ -0,0 +1,4 @@
+library;
+
+export 'src/geometry.dart';
+export 'src/axis.dart';

thermion_dart/lib/src/viewer/src/ffi/src/ffi_camera.dart

@@ -2,7 +2,7 @@ import 'dart:ffi';
 
 import 'package:vector_math/vector_math_64.dart';
 
-import '../../../../utils/matrix.dart';
+import '../../../../utils/src/matrix.dart';
 import '../../thermion_viewer_base.dart';
 import 'thermion_dart.g.dart' as g;
 

thermion_dart/lib/src/viewer/src/ffi/src/ffi_gizmo.dart

@@ -3,7 +3,7 @@ import 'dart:ffi';
 
 import 'package:thermion_dart/src/viewer/src/ffi/src/thermion_dart.g.dart';
 
-import '../../../../utils/gizmo.dart';
+import '../../../../utils/src/gizmo.dart';
 import '../../../viewer.dart';
 
 class FFIGizmo extends BaseGizmo {