Add support to change material and geometry class in GeometryGeneratorPlugin.

plugins/geometry-generator/package-lock.json

 {
     "name": "@threepipe/plugin-geometry-generator",
-    "version": "0.2.1",
+    "version": "0.2.2",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "@threepipe/plugin-geometry-generator",
-            "version": "0.2.1",
+            "version": "0.2.2",
             "license": "Apache-2.0",
             "dependencies": {
                 "threepipe": "file:./../../src/"

plugins/geometry-generator/package.json

 {
     "name": "@threepipe/plugin-geometry-generator",
     "description": "Geometry generator plugin to create updatable parametric objects/geometries.",
-    "version": "0.2.1",
+    "version": "0.2.2",
     "devDependencies": {
     },
     "dependencies": {

plugins/geometry-generator/src/GeometryGeneratorPlugin.ts

 import {
     AViewerPluginSync,
+    BufferGeometry,
     BufferGeometry2,
     IGeometry,
+    IMaterial,
     Mesh2,
     type Object3DGeneratorPlugin,
     PhysicalMaterial,
 import {PlaneGeometryGenerator} from './primitives/PlaneGeometryGenerator'
 import {CylinderGeometryGenerator} from './primitives/CylinderGeometryGenerator'
 import {GeometryGenerator, updateUi} from './AGeometryGenerator'
+import {Class} from 'ts-browser-helpers'
 
 /**
  * GeometryGeneratorPlugin
         cylinder: new CylinderGeometryGenerator('cylinder'),
     }
 
+    defaultMaterialClass: Class<IMaterial> = PhysicalMaterial
+    defaultGeometryClass: Class<BufferGeometry> = BufferGeometry2
+
     generateObject(type: string, params?: any) {
         const generator = this.generators[type]
         if (!generator) throw new Error('Unknown generator type: ' + type)
-        const obj = new Mesh2(params?.geometry ?? new BufferGeometry2(), params?.material ?? new PhysicalMaterial())
+        const obj = new Mesh2(params?.geometry ?? new this.defaultGeometryClass(), params?.material ?? new this.defaultMaterialClass())
         generator.generate(obj.geometry, params)
         obj.name = type
         obj.geometry.name = 'Generated ' + type