Fix Typo

src/Materials/PBR/pbrMaterial.ts

@@ -762,7 +762,7 @@ export class PBRMaterial extends PBRBaseMaterial {
             material.brdf.parse(source.brdf);
         }
         if (source.sheen) {
-            material.sheen.parse(source.brdf);
+            material.sheen.parse(source.sheen);
         }
         if (source.subSurface) {
             material.subSurface.parse(source.subSurface);

src/Materials/PBR/pbrMetallicRoughnessMaterial.ts

@@ -128,7 +128,7 @@ export class PBRMetallicRoughnessMaterial extends PBRBaseSimpleMaterial {
             material.brdf.parse(source.brdf);
         }
         if (source.sheen) {
-            material.sheen.parse(source.brdf);
+            material.sheen.parse(source.sheen);
         }
         if (source.subSurface) {
             material.subSurface.parse(source.subSurface);

src/Materials/PBR/pbrSpecularGlossinessMaterial.ts

@@ -118,7 +118,7 @@ export class PBRSpecularGlossinessMaterial extends PBRBaseSimpleMaterial {
             material.brdf.parse(source.brdf);
         }
         if (source.sheen) {
-            material.sheen.parse(source.brdf);
+            material.sheen.parse(source.sheen);
         }
         if (source.subSurface) {
             material.subSurface.parse(source.subSurface);