Hi Burr, actually it does work like that so you may like to use the value in that way.
For example here is one with Rho = 0.5 :
And here Rho = 0.6 :
And here Rho = 0.8 :
As the value moves towards 0 it becomes flatter, here is Rho = 0.01 :
The category of conic section is also related to the Rho value.
With Rho = 0.5, the curve is a segment of a parabola.
With Rho > 0.5 and < 1, the curve is a segment of a hyperbola.
With Rho < 0.5, the curve is a segment of an ellipse.
- Michael
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