[vtkusers] Basic questions?

[Anders Wallin]

1. If I want to write my own source-class, what is the minimal
functionality I need to provide so it can work as input to a
PolyDataMapper? Is there a simple example somewhere? In Python?
2. I want to load from disk and render STL-surfaces, i.e. a bunch of
triangles. I have code for reading triangles from disk into Python,
but what source/data class should I use? Examples?
3. Is there a source-class for a single point/vertex?

thanks,
AW