hi!!! there is a possibility that a polygon or a line to be angled in ArcScene...

[margal]

[DanPatterson_Retired]

Show what you have so far that is producing a result.  Are you trying to do City Engine stuff in arcscene?

[margal]

no! I wish to build my house in arcscene .....and i have troubles with the roof

[DanPatterson_Retired]

Displaying 3D multipatch features—Help | ArcGIS for Desktop

would be the place to start... note, that near the topic of the help is a little toggle that will allow you to switch between arcmap versions... which should reflect changes between them.