pointsurfaceSphere Class Reference

Generate points of the surface of a sphere. This uses Monte-Carlo style point rejection. More...

#include <pointsurface.h>

List of all members.

Public Member Functions
void	operator() (bool &accept, double &x, double &y, double &z, doublec u, doublec v, doublec w)
	Given a random point in a unit cube generate a random point on the sphere's surface.

---

Detailed Description

Generate points of the surface of a sphere. This uses Monte-Carlo style point rejection.

Definition at line 120 of file pointsurface.h.

---

Member Function Documentation

void pointsurfaceSphere::operator()	(	bool &	accept,
		double &	x,
		double &	y,
		double &	z,
		doublec	u,
		doublec	v,
		doublec	w
	)

Given a random point in a unit cube generate a random point on the sphere's surface.

Definition at line 6 of file pointsurface.cpp.

{
  double u2(u*2.0-1.0);
  double v2(v*2.0-1.0);
  double w2(w*2.0-1.0);

  // Poor zero test but its a quick function.
  double dotprod = u2*u2+v2*v2+w2*w2;
  if ( (dotprod>1.0) || (dotprod==0.0) )
  {
    accept=false;
    return;
  }
   
  // Assume non-zero u,v,w.
  double t = (double)1.0 / sqrt(dotprod);

  x=u2*t;
  y=v2*t;
  z=w2*t;

  accept=true;
}  

---

The documentation for this class was generated from the following files:

• graphicslib/pointsurface.h
• graphicslib/pointsurface.cpp