Thank you.

the second part of my question still remains:

I have the matrices whose rows constitute normal vectors, and coefficients
of quadratics, isn't there anything in Povray so that when I define my
matrices, I can access elements say matrix is M, then M(i,j) is (i,j) th
element.

If there is no such thing, how to read data from a text file (I will put my
matrices in a text file)?














Alain <ele### [at] netscapenet> wrote:
> Katherina nous apporta ses lumieres en ce 2007/08/05 09:41:
> > Hi,
> >
> > I'm very new at Povray. I have data for forming a solid from planes and
> > quadratics. I want to form the solid.
> >
> > I found plane and quadric commands to form  a plane and a quadratic, I used
> > Povray to render them.
> >
> > But since they are infinite, how I will make them finite, and will I use
> > merge? union? bounded_by? Can you give a simple example of a solid formed by
> > planes and quadratics?
> >
> > I have coefficients for quadratic object, if I form a matrix from
> > coefficients in the pov file, Povray can read from that matrix?Can you give
> > a simple example?
> >
> > Thanks
> >
> >
> >
> >
> >
> >
> >
> If you intersect planes you can get finite objects. The intersection of a plane
> and any finite object will be finite. The intersection of 4 or more planes will
> usualy be finite, but may need some manual bounding.
>
> Sample: intersection{plane{y,1}plane{y,1 rotate 90*x}plane{y,1 rotate
> z*90}plane{y,1 rotate -90*x}plane{y,1 rotate -90*z}plane{y,1 rotate 180*x}}// a
> box the hard way.
>
> Quadrics are not laways infinite, it completely depends on the parameters used.
> You may need to manualy bound some quadrics.
> Take a look the shapesq.inc include file. It contains several predeffined
> quadrics shapes.
> Go to the portfolio folder and render the various scenes. They will create
> references images from the various includes. Render o_shapesq.ini to generate
> the reference pages and images for the quadrics.
>
> --
> Alain
> -------------------------------------------------
> You know you've been raytracing too long when your ophthalmologist examines you
> for complaints of eye strain and blurred vision and asks you why the words Pov,
> #declare, #include, sphere, translate, rotate, texture, and pigment are
> permanently burned into your retina.
> Ken Tyler

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