"Edit Angular Shape" can change the shape of the woodgrain. It use polar
coordinate. In fact it control a series of value(default value = 1). When you
drag a control node to make a larger radius, it make the value > 1; when you
drag a control node to make a smaller radius, it make the value < 1.
These three curves located at r = 0.266..m, r = 0.533..m, r = 0.8m.
This is an approximate method. The output result should be accurate when you
just adjust the shape slightly. But if you distort the shape overly the result
will be unpredictable.
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