How can I change the colour of the line in vtkLineWidget ?
How can I change the colour of the lines in vtkResliceCursorWidget ?
Look at vtkLineWidget, in particular, GetLineProperty()
vtkProperty will let you change the line colour. You can also change the ball colour, see GetHandleProperty().
I don’t think you can change cursor colours in vtkResliceCursorWidget.
Does not work in vtk.js
lineWidget.GetLineProperty is not a function