Creates a gsk.render_node.RenderNode that will do a cross-fade between start and end.
The start node to be drawn
The node to be cross_fadeed onto the start node
How far the fade has progressed from start to end. The value will be clamped to the range [0 ... 1]
A new gsk.render_node.RenderNode
Creates a gsk.render_node.RenderNode that will do a cross-fade between start and end.