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Julien Finet authored
-You can edit control points in 2 fashions: If vtkControlPointsItem::StrokeMode is true, you can "draw" points while the left mouse button is down, it will add control points under the mouse cursor. If vtkControlPointsItem::StrokeMode is false, you can drag&drop existing points. SwitchPointsMode control the behavior to follow when a point crosses another. In both modes, if you click the left button mouse not on a point, a point is created under the mouse cursor. -Add vtkCompositeControlPointsItem to mix ct function and opacity function. It creates points for Color Transfer and Opacity functions.Both functions will share the same control points. -Add vtkControlPointsItem::EditPoint to control midpoint and sharpness -Support null transfer functions in the ScalarsToColors items
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