properly free memory in model/view matrix getters

example/lib/scene_menu.dart

@@ -1,3 +1,5 @@
+import 'dart:math';
+
 import 'package:flutter/material.dart';
 
 import 'package:flutter_filament/filament_controller.dart';
@@ -105,6 +107,12 @@ class _SceneMenuState extends State<SceneMenu> {
         },
         child: const Text("Move camera to shapes asset"),
       ),
+      MenuItemButton(
+        onPressed: () {
+          widget.controller!.setCameraRotation(pi / 4, 0.0, 1.0, 0.0);
+        },
+        child: const Text("Rotate camera 45 degrees around y axis"),
+      ),
       MenuItemButton(
         onPressed: () {
           setState(() {

lib/filament_controller.dart

@@ -348,7 +348,7 @@ abstract class FilamentController {
   Future<Matrix4> getCameraViewMatrix();
 
   ///
-  /// Set the camera position in world space.
+  /// Set the camera position in world space. Note this is not persistent - any viewport navigation will reset the camera transform.
   ///
   Future setCameraPosition(double x, double y, double z);
 
@@ -374,7 +374,7 @@ abstract class FilamentController {
       double aperture, double shutterSpeed, double sensitivity);
 
   ///
-  /// Rotate the camera by [rads] around the given axis.
+  /// Rotate the camera by [rads] around the given axis. Note this is not persistent - any viewport navigation will reset the camera transform.
   ///
   Future setCameraRotation(double rads, double x, double y, double z);
 

lib/filament_controller_ffi.dart

@@ -992,7 +992,9 @@ class FilamentControllerFFI extends FilamentController {
       throw Exception("No viewer available");
     }
     var arrayPtr = _lib.get_camera_view_matrix(_viewer!);
-    return Matrix4.fromList(arrayPtr.asTypedList(16));
+    var viewMatrix = Matrix4.fromList(arrayPtr.asTypedList(16));
+    calloc.free(arrayPtr);
+    return viewMatrix;
   }
 
   @override
@@ -1001,7 +1003,9 @@ class FilamentControllerFFI extends FilamentController {
       throw Exception("No viewer available");
     }
     var arrayPtr = _lib.get_camera_model_matrix(_viewer!);
-    return Matrix4.fromList(arrayPtr.asTypedList(16));
+    var modelMatrix = Matrix4.fromList(arrayPtr.asTypedList(16));
+    calloc.free(arrayPtr);
+    return modelMatrix;
   }
 
   @override