diff --git a/packages/viewer/src/index.ts b/packages/viewer/src/index.ts
index e38a1cdc05..182a7bd2b7 100644
--- a/packages/viewer/src/index.ts
+++ b/packages/viewer/src/index.ts
@@ -119,6 +119,11 @@ import { DepthNormalPass } from './modules/pipeline/Passes/DepthNormalPass.js'
 import { BasitPass } from './modules/pipeline/Passes/BasitPass.js'
 import { ProgressiveAOPass } from './modules/pipeline/Passes/ProgressiveAOPass.js'
 import { TAAPass } from './modules/pipeline/Passes/TAAPass.js'
+import {
+  FilterMaterial,
+  FilterMaterialOptions,
+  FilterMaterialType
+} from './modules/materials/Materials.js'
 
 export {
   Viewer,
@@ -201,7 +206,10 @@ export {
   MRTShadedViewPipeline,
   MRTPenViewPipeline,
   ViewModes,
-  ViewMode
+  ViewMode,
+  FilterMaterial,
+  FilterMaterialType,
+  FilterMaterialOptions
 }
 
 export type {
diff --git a/packages/viewer/src/modules/Viewer.ts b/packages/viewer/src/modules/Viewer.ts
index 47a3f2954a..0aaa797574 100644
--- a/packages/viewer/src/modules/Viewer.ts
+++ b/packages/viewer/src/modules/Viewer.ts
@@ -79,11 +79,9 @@ export class Viewer extends EventEmitter implements IViewer {
     const cs = []
     let pt = obj
     do {
-      if ((pt = Object.getPrototypeOf(pt))) cs.push(pt.constructor || null)
+      if ((pt = Object.getPrototypeOf(pt))) cs.push(pt.constructor.name || null)
     } while (pt !== null)
-    return cs.map(function (c) {
-      return c ? c.toString().split(/\s|\(/)[1] : null
-    })
+    return cs
   }
 
   public createExtension<T extends Extension>(type: Constructor<T>): T {