Back engineering

Discussion in 'How Do I...' started by Longshaor, Oct 27, 2011.

  1. Longshaor

    Longshaor Member

    Hi all,

    I've been doing other things for a while now, but a problem one of my best mates was having got me thinking about card modeling again and, try as I might, I can't wrap my head around this.

    The item is a cone-shaped lamp shade. To my mind, a lamp shade is two circles of differing diameters separated by a vertical distance, so there must me some mathematical way to convert those circles into an arc to 'flatten' the cone from a 3D object to a 2D pattern. The problem is, try as I might, I can't figure this one out! Can anybody help me here?

    Cheers & Thanks in advance!
  2. murphyaa

    murphyaa Designer

  3. Zathros

    Zathros Guest

    What you wish to do is construct a Frustrum. It can be frustrating. This link will show you how. You do not need to buy or download anything, a calculator does help. :)

    These types of problems and their equations can be found on the link above.
  4. Longshaor

    Longshaor Member

    YES!!!! I thought the frustrum had something to do with it. Thanks for the link!
  5. RocketmanTan

    RocketmanTan Well-Known Member

    I've tried doing it the mathematical way, but I usually get lazy and just use Siatki. I try to make up for it by using the pythagoras theorem and pi for triangles and circles, though :p

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