Add ViewerUiConfigPlugin and SceneUiConfigPlugin for previewing in the editor.

src/plugins/index.ts

 
 // ui
 export {RenderTargetPreviewPlugin} from './ui/RenderTargetPreviewPlugin'
+export {ViewerUiConfigPlugin} from './ui/ViewerUiConfigPlugin'
+export {SceneUiConfigPlugin} from './ui/SceneUiConfigPlugin'
 
 // interaction
 export {DropzonePlugin, type DropzonePluginOptions} from './interaction/DropzonePlugin'
 
 // import
 export {Rhino3dmLoadPlugin} from './import/Rhino3dmLoadPlugin'
+
+// postprocessing
+export {TonemapPlugin} from './postprocessing/TonemapPlugin'

src/plugins/ui/SceneUiConfigPlugin.ts

+import {AViewerPluginSync, ThreeViewer} from '../../viewer'
+import {serialize} from 'ts-browser-helpers'
+import {RootScene} from '../../core'
+
+export class SceneUiConfigPlugin extends AViewerPluginSync<''> {
+    static readonly PluginType = 'SceneUiConfigPlugin'
+    enabled = true
+    serializeWithViewer = false
+    constructor() {
+        super()
+        this.uiConfig = {}
+    }
+    onAdded(viewer: ThreeViewer) {
+        super.onAdded(viewer)
+        this.uiConfig = viewer.scene.uiConfig
+        this._scene = viewer.scene
+    }
+    @serialize('scene')
+    protected _scene: RootScene | undefined
+}

src/plugins/ui/ViewerUiConfigPlugin.ts

+import {AViewerPluginSync, ThreeViewer} from '../../viewer'
+import {serialize} from 'ts-browser-helpers'
+
+export class ViewerUiConfigPlugin extends AViewerPluginSync<''> {
+    static readonly PluginType = 'ViewerUiConfigPlugin'
+    enabled = true
+    serializeWithViewer = false
+    constructor() {
+        super()
+        this.uiConfig = {}
+    }
+    onAdded(viewer: ThreeViewer) {
+        super.onAdded(viewer)
+        this.uiConfig = viewer.uiConfig
+    }
+
+    @serialize('viewer')
+    protected _viewer: ThreeViewer | undefined // todo: fix deserialization throwing error
+
+    // toJSON(): any {
+    //     return this._viewer?.toJSON() ?? {}
+    // }
+    // fromJSON(data: ISerializedViewerConfig, meta?: SerializationMetaType): this | null {
+    //     this._viewer?.fromJSON(data, meta)
+    //     return this
+    // }
+}