extruding splines

V-Ray V-Ray Common Off-topic
1

ot:

but here is a basic modelling question:

i imported a parrallel spline in max and want to extrude it with the top closed:

but what i get is just the splines extruded without a lid:

2

ok. found it:

the vertices are not welded with the import dialog.
maunal welding did the job better.

now work fine: