I'm in the beginning stages of a project that will have exposed HVAC ducting and I'm having a difficult time getting the color to change. It's something to do with lighting but I've tried everything I can think of. The ducting shows up as neon...I've tried changing the material, changing material properties, adding other lighting, adding a roof to the room. The weird thing is that the color on duct connectors and vents are fine, it's just the polyline moulding itself. GAH! Anyone know how to fix this?