add setCameraModelMatrix method for iOS

example/lib/main.dart

@@ -209,6 +209,8 @@ class _MyAppState extends State<MyApp> {
         await _filamentController.clearLights();
         break;
       case 32:
+        await _filamentController
+            .setCameraModelMatrix(List<double>.filled(16, 1.0));
 
         // await _filamentController.setBoneTransform(
         //     _cube!,
@@ -297,6 +299,7 @@ class _MyAppState extends State<MyApp> {
                     _item(value: 29, child: Text('add light')),
                     _item(value: 30, child: Text('remove light')),
                     _item(value: 31, child: Text('clear all lights')),
+                    _item(value: 32, child: Text('set camera model matrix')),
                   ])),
               Container(
                   width: _vertical ? 200 : 400,

ios/Classes/SwiftPolyvoxFilamentPlugin.swift

@@ -326,10 +326,12 @@ public class SwiftPolyvoxFilamentPlugin: NSObject, FlutterPlugin, FlutterTexture
           let meshName = args[1] as! String
           let numNames = get_morph_target_name_count(assetPtr, meshName)
           var names = [String]()
-          for i in 0...numNames - 1 {
+          if(numNames > 0) {
-            let outPtr = UnsafeMutablePointer<CChar>.allocate(capacity:256)
+            for i in 0...numNames - 1 {
-            get_morph_target_name(assetPtr, meshName, outPtr, i)
+              let outPtr = UnsafeMutablePointer<CChar>.allocate(capacity:256)
-            names.append(String(cString:outPtr))
+              get_morph_target_name(assetPtr, meshName, outPtr, i)
+              names.append(String(cString:outPtr))
+            }
           }
           result(names);
         case "getAnimationNames":
@@ -419,6 +421,12 @@ public class SwiftPolyvoxFilamentPlugin: NSObject, FlutterPlugin, FlutterTexture
           let args = call.arguments as! Array<Any>
           set_camera_rotation(self.viewer, Float(args[0] as! Double), Float(args[1] as! Double), Float(args[2] as! Double),Float(args[3] as! Double))
           result("OK")
+        case "setCameraModelMatrix":
+          let matrix = call.arguments as! FlutterStandardTypedData
+          matrix.data.withUnsafeBytes{ (floatPtr: UnsafePointer<Float>) in
+            set_camera_model_matrix(self.viewer, floatPtr)
+          }
+          result("OK")
         case "setCameraFocalLength":
           set_camera_focal_length(self.viewer, Float(call.arguments as! Double))
           result("OK");

ios/include/FilamentViewer.hpp

@@ -81,6 +81,7 @@ namespace polyvox {
 
             void setCameraPosition(float x, float y, float z);
             void setCameraRotation(float rads, float x, float y, float z);
+            void setCameraModelMatrix(const float* const matrix);
             void setCameraFocalLength(float fl);
             void setCameraFocusDistance(float focusDistance);
 

ios/include/PolyvoxFilamentApi.h

@@ -52,17 +52,17 @@ void grab_begin(void* viewer, float x, float y, bool pan);
 void grab_update(void* viewer, float x, float y);
 void grab_end(void* viewer);
 
-    void apply_weights(void* asset, float* const weights, int count);
+void apply_weights(void* asset, float* const weights, int count);
-        
+    
-    void set_animation(
+void set_animation(
-        void* asset, 
+    void* asset, 
-        const float* const morphData, 
+    const float* const morphData, 
-        int numMorphWeights, 
+    int numMorphWeights, 
-        const BoneAnimation* const boneAnimations,
+    const BoneAnimation* const boneAnimations,
-        int numBoneAnimations,
+    int numBoneAnimations,
-        int numFrames, 
+    int numFrames, 
-        float frameLengthInMs
+    float frameLengthInMs
-    );
+);
 
 // void set_bone_transform(
 //     void* asset, 
@@ -103,6 +103,7 @@ void set_scale(void* asset, float scale);
 
 void set_camera_position(void* viewer, float x, float y, float z);
 void set_camera_rotation(void* viewer, float rads, float x, float y, float z);
+void set_camera_model_matrix(void* viewer, const float* const matrix);
 void set_camera_focal_length(void* viewer, float focalLength);
 void set_camera_focus_distance(void* viewer, float focusDistance);
       

ios/src/FilamentViewer.cpp

@@ -904,6 +904,34 @@ void FilamentViewer::setCameraRotation(float rads, float x, float y, float z) {
   cam.setModelMatrix(_cameraPosition * _cameraRotation);
 }
 
+void FilamentViewer::setCameraModelMatrix(const float* const matrix) {
+  if(_manipulator) {
+    delete _manipulator;
+    _manipulator = nullptr;
+  }
+  Camera& cam =_view->getCamera();
+
+  mat4 modelMatrix(
+    matrix[0],
+   matrix[1],
+   matrix[2],
+   matrix[3],
+   matrix[4],
+   matrix[5],
+   matrix[6],
+   matrix[7],
+   matrix[8],
+   matrix[9],
+   matrix[10],
+   matrix[11],
+   matrix[12],
+   matrix[13],
+   matrix[14],
+   matrix[15]
+);
+  cam.setModelMatrix(modelMatrix);
+}
+
 void FilamentViewer::_createManipulator() {
   if(_manipulator) {
     delete _manipulator;
@@ -919,7 +947,7 @@ void FilamentViewer::_createManipulator() {
                   .targetPosition(tp[0], tp[1], tp[2])
                   .build(Mode::ORBIT);
   _lastFrameTimeInNanos = 0;
-  Log("Created orbit manipulator for vp width %d height %d with home %f %f %f and target pos %f %f %f ", vp.width, vp.height, home[0], home[1], home[2], tp[0], tp[1], tp[2]);
+  // Log("Created orbit manipulator for vp width %d height %d with home %f %f %f and target pos %f %f %f ", vp.width, vp.height, home[0], home[1], home[2], tp[0], tp[1], tp[2]);
 }
 
 void FilamentViewer::grabBegin(float x, float y, bool pan) {
@@ -958,9 +986,27 @@ void FilamentViewer::grabEnd() {
     delete _manipulator;
     _manipulator = nullptr;
     Camera& cam =_view->getCamera();
-    math::float3 home = cam.getPosition();
+    math::mat4 camMatrix = cam.getModelMatrix();
-    math::float3 fv = cam.getForwardVector();
+    // math::float3 home = cam.getPosition();
-    Log("Destroyed manipulator, end camera pos/fv was %f %f %f / %f %f %f ", home[0], home[1], home[2], fv[0], fv[1], fv[2]);
+    // math::float3 fv = cam.getForwardVector();
+    Log("Destroyed manipulator, end camera model matrix was %0.3f %0.3f %03.f %03.f %0.3f %0.3f %03.f %03.f %0.3f %0.3f %03.f %03.f %0.3f %0.3f %03.f %03.f ", 
+    camMatrix[0][0],
+    camMatrix[0][1],
+    camMatrix[0][2],
+    camMatrix[0][3],
+    camMatrix[1][0],
+    camMatrix[1][1],
+    camMatrix[1][2],
+    camMatrix[1][3],
+    camMatrix[2][0],
+    camMatrix[2][1],
+    camMatrix[2][2],
+    camMatrix[2][3],
+    camMatrix[3][0],
+    camMatrix[3][1],
+    camMatrix[3][2],
+    camMatrix[3][3]
+    );
   } else {
     Log("Error - trying to call GrabEnd when a manipulator is not available. Ensure you call grabBegin before grabUpdate/grabEnd");
   }
@@ -992,4 +1038,4 @@ void FilamentViewer::scrollEnd() {
 
 } // namespace polyvox
 
-  
+  

ios/src/PolyvoxFilamentApi.cpp

@@ -82,6 +82,10 @@ extern "C" {
     ((FilamentViewer*)viewer)->setCameraRotation(rads, x, y, z);
   }
 
+  void set_camera_model_matrix(void* viewer, const float* const matrix) {
+    ((FilamentViewer*)viewer)->setCameraModelMatrix(matrix);
+  }
+
   void set_camera_focal_length(void* viewer, float focalLength) {
     ((FilamentViewer*)viewer)->setCameraFocalLength(focalLength);
   }

lib/filament_controller.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:typed_data';
 import 'dart:ui';
 import 'animations/animation_builder.dart';
 import 'animations/animations.dart';
@@ -88,6 +89,7 @@ abstract class FilamentController {
   Future setCameraFocusDistance(double focusDistance);
   Future setCameraPosition(double x, double y, double z);
   Future setCameraRotation(double rads, double x, double y, double z);
+  Future setCameraModelMatrix(List<double> matrix);
 
   ///
   /// Animates morph target weights/bone transforms (where each frame requires a duration of [frameLengthInMs].
@@ -362,6 +364,11 @@ class PolyvoxFilamentController extends FilamentController {
     await _channel.invokeMethod("setCameraRotation", [rads, x, y, z]);
   }
 
+  Future setCameraModelMatrix(List<double> matrix) async {
+    await _channel.invokeMethod(
+        "setCameraModelMatrix", Float32List.fromList(matrix));
+  }
+
   Future setTexture(FilamentAsset asset, String assetPath,
       {int renderableIndex = 0}) async {
     await _channel