Update viewer.js

viewer.js

@@ -233,7 +233,7 @@ export async function initializeViewer(config, instanceId) {
         tubeTransparent.blendType = pc.BLEND_NORMAL;
         tubeTransparent.opacityMap = opTubetex;
         tubeTransparent.opacityMapChannel = "r";
-        tubeTransparent.opacity = 1;                         
+        tubeTransparent.opacity = 0.03;                         
         tubeTransparent.depthTest = false;
         tubeTransparent.depthWrite = false;
         tubeTransparent.useMetalness = true;