Subject says it all really - Or am I missing something ?

Martin Spencer-Ford

You might be missing something.

Have a look under Draw Curve > More > Conic and enter an Rho value of 0.5
Is that what you want?

Look for Rho in the MoI help file for more info on conics.




Martin.

It's close, but i feel it's me missing something. Draw an eclipse curve, than use conic to for a bullet head, nose cone shape etc, try a rail revolve and it fails to produce a paraboloid as expected :(

Martin Spencer-Ford

There are elliptic and hyperbolic paraboloids.
"Mathematics: a geometric surface whose sections parallel to two coordinate planes are parabolic and whose sections parallel to the third plane are either elliptical or hyperbolic"

- Brian

Sussed it now .... I shall blame it on a lack of nutrition

I feel all stupid now - lol

Martin Spencer-Ford

Now try moving the elliptical rail. The surface moves also.
Just noticed that this morning...

- Brian

Now that's cool Brian - Give the show points a go too, volcano effect rapidly achieved :)

Thanks fir the tip

Martin Spencer-Ford

A quick picture of the result of moving the rail, after the revolve: