enable camera rotate

example/lib/main.dart

@@ -21,7 +21,7 @@ class MyApp extends StatefulWidget {
 class _MyAppState extends State<MyApp> {
   final FilamentController _filamentController = MimeticFilamentController();
 
-  double _zoomValue = 0;
+  bool _rotate = false;
   int _primitiveIndex = 0;
   double _weight = 0.0;
 
@@ -40,19 +40,27 @@ class _MyAppState extends State<MyApp> {
         body: GestureDetector(
             behavior: HitTestBehavior.opaque,
             onPanDown: (details) {
-              _filamentController.panStart(
-                  details.localPosition.dx, details.localPosition.dy);
+              _rotate
+                  ? _filamentController.rotateStart(
+                      details.localPosition.dx, details.localPosition.dy)
+                  : _filamentController.panStart(
+                      details.localPosition.dx, details.localPosition.dy);
             },
             onPanUpdate: (details) {
-              _filamentController.panUpdate(
-                  details.localPosition.dx, details.localPosition.dy);
+              _rotate
+                  ? _filamentController.rotateUpdate(
+                      details.localPosition.dx, details.localPosition.dy)
+                  : _filamentController.panUpdate(
+                      details.localPosition.dx, details.localPosition.dy);
             },
             onPanEnd: (d) {
-              _filamentController.panEnd();
+              _rotate
+                  ? _filamentController.rotateEnd()
+                  : _filamentController.panEnd();
             },
             child: Stack(children: [
               FilamentWidget(controller: _filamentController),
-              Column(children: [
+              Column(mainAxisSize: MainAxisSize.min, children: [
                 ElevatedButton(
                     child: Text("initialize"),
                     onPressed: () {
@@ -63,9 +71,9 @@ class _MyAppState extends State<MyApp> {
                           "assets/default_env/default_env_ibl.ktx");
                       _filamentController.loadGltf(
                           "assets/guy.gltf", "assets", "Material");
-                      _filamentController.createMorpher(
-                          "CC_Base_Body.003", "CC_Base_Body.003",
-                          materialName: "Material");
+                      // _filamentController.createMorpher(
+                      //     "CC_Base_Body.003", "CC_Base_Body.003",
+                      //     materialName: "Material");
                     }),
                 // ElevatedButton(
                 //     child: Text("load skybox"),
@@ -121,13 +129,20 @@ class _MyAppState extends State<MyApp> {
                       });
                     }),
                 Row(children: [
+                  Checkbox(
+                      value: _rotate,
+                      onChanged: (v) {
+                        setState(() {
+                          _rotate = v == true;
+                        });
+                      }),
                   ElevatedButton(
-                      onPressed: () => _filamentController.zoom(1.0),
+                      onPressed: () => _filamentController.zoom(100.0),
                       child: Text("+")),
                   ElevatedButton(
-                      onPressed: () => _filamentController.zoom(-1.0),
+                      onPressed: () => _filamentController.zoom(-100.0),
                       child: Text("-"))
-                ])
+                ]),
               ]),
             ])),
       ),

ios/Classes/filament/FilamentMethodCallHandler.mm

@@ -71,6 +71,18 @@ static void* freeResourceGlobal(void* mem, size_t size, void* misc) {
     if(!_viewer)
       return;
     _viewer->manipulator->grabEnd();
+  } else if([@"rotateStart" isEqualToString:call.method]) {
+    if(!_viewer)
+      return;
+    _viewer->manipulator->grabBegin([call.arguments[0] intValue], [call.arguments[1] intValue], false);
+  } else if([@"rotateUpdate" isEqualToString:call.method]) {
+    if(!_viewer)
+      return;
+    _viewer->manipulator->grabUpdate([call.arguments[0] intValue], [call.arguments[1] intValue]);
+  } else if([@"rotate	End" isEqualToString:call.method]) {
+    if(!_viewer)
+      return;
+    _viewer->manipulator->grabEnd();
   } else if([@"createMorpher" isEqualToString:call.method]) {
     _viewer->createMorpher([call.arguments[0] UTF8String], [call.arguments[1] UTF8String],[call.arguments[2] UTF8String]);
   } else if([@"applyWeights" isEqualToString:call.method]) {

lib/filament_controller.dart

@@ -10,6 +10,9 @@ abstract class FilamentController {
   Future panStart(double x, double y);
   Future panUpdate(double x, double y);
   Future panEnd();
+  Future rotateStart(double x, double y);
+  Future rotateUpdate(double x, double y);
+  Future rotateEnd();
   Future applyWeights(List<double> weights, int primitiveIndex);
   Future createMorpher(String meshName, String entityName,
       {String? materialName});
@@ -58,6 +61,18 @@ class MimeticFilamentController extends FilamentController {
     await _channel.invokeMethod("panEnd");
   }
 
+  Future rotateStart(double x, double y) async {
+    await _channel.invokeMethod("rotateStart", [x.toInt(), y.toInt()]);
+  }
+
+  Future rotateUpdate(double x, double y) async {
+    await _channel.invokeMethod("rotateUpdate", [x.toInt(), y.toInt()]);
+  }
+
+  Future rotateEnd() async {
+    await _channel.invokeMethod("rotateEnd");
+  }
+
   Future applyWeights(List<double> weights, int primitiveIndex) async {
     await _channel.invokeMethod("applyWeights", [weights, primitiveIndex]);
   }