Foundation 3D

Starbase1 · 11th Jan 2018, 09:12 AM

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

RedTed · 12th Jan 2018, 11:35 AM

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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!

David cgc · 12th Jan 2018, 04:59 PM

^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.

vitruvian · 13th Jan 2018, 04:48 PM

I´ve learned something new

https://en.wikipedia.org/wiki/Paraboloid

Starbase1 · 14th Jan 2018, 02:52 AM

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.

vitruvian · 14th Jan 2018, 08:20 AM

Quote:

Originally Posted by Starbase1

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 !

11th Jan 2018, 09:12 AM	#1
Starbase1 Registered Member Join Date: Dec 2007 Location: London Posts: 12,774	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
	__________________ - - - - - - My web site: http://nick-stevens.com/ Me on twitter, @runnymonkey, https://twitter.com/runnymonkey

12th Jan 2018, 11:35 AM	#2
RedTed Premiere Member Join Date: Sep 2012 Location: Currently A Galaxy Far Far Away Posts: 742	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!
	__________________ Intel Core i7-5960X @4.3 GHz. 32.0 GB Windows 7 Ultimate 64-bit. GeForce GTX 980 @ 2560 x 1440, 144Hz.

12th Jan 2018, 04:59 PM	#3
David cgc Premiere Member Join Date: Nov 2007 Location: California Posts: 849	^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.
	__________________ “Just as a fun exercise, imagine what a bunch of hot chicks would think if they were reading this thread over your shoulder. I like to do that from time to time.” — Samuel T. Cogley

14th Jan 2018, 02:52 AM	#5
Starbase1 Registered Member Join Date: Dec 2007 Location: London Posts: 12,774	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.
	__________________ - - - - - - My web site: http://nick-stevens.com/ Me on twitter, @runnymonkey, https://twitter.com/runnymonkey

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13th Jan 2018, 04:48 PM	#4
vitruvian Registered Member Join Date: Nov 2007 Location: Brazil - South America Posts: 764	I´ve learned something new https://en.wikipedia.org/wiki/Paraboloid

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