stl-file

Outputting stl from multiple ellipse sources VTK

Hello, I currently have a small (I'm a complete beginner) project in VTK where I've used different vtkParametricFunctionSource objects and arranged them spatially. Now what I want to do is find a way to output all that data I'm currently rendering into a .stl file. I don't know how I'd manage to convert my implicit parametric functio...