Adding a StepColorSpace that use only top color
This adds a new ColorSpace, VTK_CTF_STEP, that simply color an interval by it's top color. It also add setter methods and test for it.
Edited by Mathieu Westphal (Kitware)
This adds a new ColorSpace, VTK_CTF_STEP, that simply color an interval by it's top color. It also add setter methods and test for it.