Update viewer.js

viewer.js

@@ -230,6 +230,15 @@ export async function initializeViewer(config, instanceId) {
       app.root.addChild(glbEntity);
     }
 
+    if(config.glb_url == undefined){
+      let matSol = new pc.StandardMaterial();
+      matSol.blendType = pc.BLEND_NORMAL;
+      matSol.emissivve = new pc.Color(color_bg);
+      matSol.emissiveIntensity = 1;
+
+      glbEntity.material = matSol;
+    }
+
     const presentoirEntity =assets.presentoir.resource.instantiateRenderEntity();
     presentoirEntity.setLocalScale(presentoirScaleX, presentoirScaleY, presentoirScaleZ);
     app.root.addChild(presentoirEntity);