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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