Update viewer.js

viewer.js

@@ -266,7 +266,7 @@ export async function initializeViewer(config, instanceId) {
       tubeEmit.opacity = 0.1;                         
       tubeEmit.depthTest = true;
       tubeEmit.depthWrite = false;
-      tubeEmit.useMetalness = true;
+      tubeEmit.useMetalness = false;
       tubeEmit.useDynamicRefraction = true;
       tubeEmit.thickness = 0.04;
       tubeEmit.update();