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Le 20/07/2015 08:27, bakom a écrit :
> Hi, I have a macro for torus as
> 
> #include"transforms.inc" #macro Torus(Center, Normal, Radius1,
> Radius2) torus{ Radius1, Radius2 Reorient_Trans(y, Normal)
> translate Center } #end
> 
> object {Torus ( 1, 0, 0, 0, 0, 0, 2, 4) texture{ pigment{
> LightBlue} }}
> 
> How I modify it to make elliptical torus?
> 

If you mean a rotating disc along an ellipse, you will need to use the
true equation (fourth order polynomial), as you cannot transform the
master circle into an ellipse while keeping the rotating circle a true
circle.

If you mean rotating an ellipse along a circle (elliptic torus at
Wolfram), a scale along the single axis of the torus should satisfy
you. (as long as you accept a scaled disc to be an ellipse).

> http://mathworld.wolfram.com/EllipticTorus.html

Otherwise, the fourth order polynomial is also the way to go. (quartic)


> http://wiki.povray.org/content/Reference:Polynomial


> 
> -- Thanks Gurwinder Singh  Bains
> 
> 

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