add createGeometry

lib/filament_controller.dart

@@ -545,4 +545,10 @@ abstract class FilamentController {
   /// If there is a collision between the controlled entity and [collidableEntity], the transform will not be updated.
   ///
   Future addCollisionComponent(FilamentEntity collidableEntity);
+
+  ///
+  /// Creates a (renderable) entity with the specified geometry and adds to the scene.
+  ///
+  Future createGeometry(
+      List<double> vertices, List<int> indices, String? materialPath);
 }

lib/filament_controller_ffi.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 import 'dart:ffi';
 import 'dart:io';
-import 'dart:math';
 import 'dart:ui' as ui;
 import 'dart:developer' as dev;
 import 'package:flutter/services.dart';
@@ -1367,4 +1366,39 @@ class FilamentControllerFFI extends FilamentController {
 
     add_collision_component(_assetManager!, entity);
   }
+
+  @override
+  Future<FilamentEntity> createGeometry(
+      List<double> vertices, List<int> indices, String? materialPath) async {
+    if (_viewer == null) {
+      throw Exception("Viewer must not be null");
+    }
+
+    final materialPathPtr =
+        materialPath?.toNativeUtf8(allocator: allocator) ?? nullptr;
+    final vertexPtr = allocator<Float>(vertices.length);
+    final indicesPtr = allocator<Uint16>(indices.length);
+    for (int i = 0; i < vertices.length; i++) {
+      vertexPtr.elementAt(i).value = vertices[i];
+    }
+
+    for (int i = 0; i < indices.length; i++) {
+      indicesPtr.elementAt(i).value = indices[i];
+    }
+
+    var entity = create_geometry_ffi(_viewer!, vertexPtr, vertices.length,
+        indicesPtr, indices.length, materialPathPtr.cast<Char>());
+    if (entity == _FILAMENT_ASSET_ERROR) {
+      throw Exception("Failed to create geometry");
+    }
+
+    _entities.add(entity);
+    _onLoadController.sink.add(entity);
+
+    allocator.free(materialPathPtr);
+    allocator.free(vertexPtr);
+    allocator.free(indicesPtr);
+
+    return entity;
+  }
 }

lib/generated_bindings.dart

@@ -835,6 +835,19 @@ external void add_collision_component(
   int entityId,
 );
 
+@ffi.Native<
+        EntityId Function(ffi.Pointer<ffi.Void>, ffi.Pointer<ffi.Float>,
+            ffi.Int, ffi.Pointer<ffi.Uint16>, ffi.Int, ffi.Pointer<ffi.Char>)>(
+    symbol: 'create_geometry', assetId: 'flutter_filament_plugin')
+external int create_geometry(
+  ffi.Pointer<ffi.Void> viewer,
+  ffi.Pointer<ffi.Float> vertices,
+  int numVertices,
+  ffi.Pointer<ffi.Uint16> indices,
+  int numIndices,
+  ffi.Pointer<ffi.Char> materialPath,
+);
+
 @ffi.Native<
         ffi.Pointer<ffi.Void> Function(
             ffi.Pointer<ffi.Void>,
@@ -1284,6 +1297,19 @@ external void reset_to_rest_pose_ffi(
     symbol: 'ios_dummy_ffi', assetId: 'flutter_filament_plugin')
 external void ios_dummy_ffi();
 
+@ffi.Native<
+        EntityId Function(ffi.Pointer<ffi.Void>, ffi.Pointer<ffi.Float>,
+            ffi.Int, ffi.Pointer<ffi.Uint16>, ffi.Int, ffi.Pointer<ffi.Char>)>(
+    symbol: 'create_geometry_ffi', assetId: 'flutter_filament_plugin')
+external int create_geometry_ffi(
+  ffi.Pointer<ffi.Void> viewer,
+  ffi.Pointer<ffi.Float> vertices,
+  int numVertices,
+  ffi.Pointer<ffi.Uint16> indices,
+  int numIndices,
+  ffi.Pointer<ffi.Char> materialPath,
+);
+
 final class __mbstate_t extends ffi.Union {
   @ffi.Array.multi([128])
   external ffi.Array<ffi.Char> __mbstate8;