I created strings for my acoustic guitar by creating a curve and a nurbs circle and then extruded the circle along the curve. The curve twists several times around the tuning keys in my viewport beautifully but in my software renders it is not visible. The string is visible but disappears as it twists around the tuning keys. What is wrong....any suggestions? I have converted the string from nurbs to both polygon and subd's but with no success....they don't convert well at all...very corrupted. Do I need to build my guitar strings directly from polygon cylinders? Any suggestions appreciated.