Velocity obstacle

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A right conoid as a ruled surface.

In geometry, a right conoid is a ruled surface generated by a family of straight lines that all intersect perpendicularly a fixed straight line, called the axis of the right conoid.

Using a Cartesian coordinate system in three-dimensional space, if we take the z-axis to be the axis of a right conoid, then the right conoid can be represented by the parametric equations:

where h(u) is some function for representing the height of the moving line.

Examples

Generation of a typical right conoid

A typical example of right conoids is given by the parametric equations:

The image on the right shows how the coplanar lines generate the right conoid.

Other right conoids include:

  1. Helicoid:
  2. Whitney umbrella:
  3. Wallis’s conical edge:
  4. Plücker’s conoid:
  5. hyperbolic paraboloid: (with x-axis and y-axis as its axes).

See also

External links

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  • Right Conoid from MathWorld.
  • Plücker's conoid from MathWorld




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