Dear Teams,
As you  ArcScene can ueing for display 3D , put actually I have problem in it .
I have Shapefile (Roads) , and when I display it by ArcSense , some features appear  up of  Surface area ,but another features are not appear ,they are crossing with topography which display it  .Please find the attached .
I check elevation , it has right elevation ... 
do you have any idea why doing that ? what is solution ?  
Thanks & regards .