Double posting this to 3D and renderworks as the two issues seem linked
for images:
http://techboard.nemetschek.net/ubb/ultimatebb.php?ubb=get_topic;f=17;t=000513;p=1#000000
Stair on a volute- which needs the two square tube supports drawn:
Image 1 shows the rise- and where the support needs to hit each tread- it's in
artistic render mode.
Image 2 shows the support in artistic render mode- unfortunately this is 4 nurbs surfaces -created from polylines in plan and then reshaped as a 3D poly in elevation then "renurbed"- to get this as a single object would be nice (haven't a clue- tried loft, 3D poly's , add solids, fillet, I'm stymied- all suggestions welcome)
Image 3 shows the same as image 2 in final renderworks mode- a fairly unimpressive sight....