"Grassblade" <nomail@nomail> wrote:
> http://www.povray.org/documentation/view/3.6.1/73/ it explains how to make


page comes up:

"1.3.3.3 Isosurface Object

You know you have been raytracing too long when ...
.... You find yourself wishing you'd paid attention in math class to all
those formulae you thought you'd never have any use for in real life.
    -- Jeff Lee "

ok my triangulation.inc is for Jeff Lee

solving angles and sides is the most useful imho.

3D Macros:
  incenter(v1,v2,v3)
  centroid(v1,v2,v3)
  ccenter(v1,v2,v3)      circumcenter
  orthocenter(v1,v2,v3)
  normal_vector(v1,v2,v3)
  midpoint(v1,v2)


Functions:
  inneradius(a,b,c)
  circumradius(a,b,c)

  sss_area(a,b,c)
  sas_area(s,a,s2)
  bh_area(b,h)           Base Height

  sss_height(a,b,c)      height to side2
  sas_cos(s,a,s2)        Side Angle Side - solve length of missing side

  aas_sin(a,b,s)         AAS solve opposing side of angle2 (b)
  asa_sin(a,s,b)         ASA solve opposing side of angle2 (b)
  sss_cos(a,b,c)         SSS solve angle opposite side2    (b)
  ssa_acute(s,s2,a)      SSA solve angle opposite side2

Float Macros:
  ssa_obtuse(s,s2,a)
  sa_height(s,a)         Side Angle unknown base
  _clamp(a,n,m)

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