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Old 11th Jan 2018, 09:12 AM   #1
Starbase1
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Default LightWave - A mathematical paraboloid mesh...

Well, I've marked it as lightwave, but as I'm basically after one chunk of geometry, any convertible format would do...

I'm after a mathematically fairly accurate mesh in the shape of a paraboloid. This needs to go fairly far "up the sides" (think champagne glass).

Ad lathing is also easy, a parabola point chain would also get me close enough to the desired result.

I'm wondering if this is possible with the parametric objects, or superquadrics, which I have never used...

Thanks,
Nick
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Old 12th Jan 2018, 11:35 AM   #2
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The easiest way to do it would be to do a boolean/intersect of a cone by a double sided plane (in the background layer). Increase the number of sides of the cone to increase the accuracy of the parabola and vary the angle of the plane to vary the shape of the parabola.
It's a bit "first priciples" but it works!
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Old 12th Jan 2018, 04:59 PM   #3
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^To cut down on trial and error, you can have the plane vertical and vary the angle of the cone. Then have the side or front or whatever view in Modeler set to some sort of shaded mode, so you just see the cone up to the plane, so you'll know exactly what shape you'll get.
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Old 13th Jan 2018, 04:48 PM   #4
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Ive learned something new

https://en.wikipedia.org/wiki/Paraboloid
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Old 14th Jan 2018, 02:52 AM   #5
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Thanks All,
In the end I did this, from RebelHill on the Newtek forums.

RebelHill
So... the simplest parabola is just y=x^2... Open the plot1d tool, enter "x^2" in the equation field, set your x,y range, choose curve, hit ok. You now have a plot of x^2 which you can loft.
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Old 14th Jan 2018, 08:20 AM   #6
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Quote:
Originally Posted by Starbase1 View Post
Thanks All,
In the end I did this, from RebelHill on the Newtek forums.

RebelHill
So... the simplest parabola is just y=x^2... Open the plot1d tool, enter "x^2" in the equation field, set your x,y range, choose curve, hit ok. You now have a plot of x^2 which you can loft.
Ohhh I will send the same ! Nice that you had found it too !
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