coordsys.h File Reference

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Defines
#define	TWOPI   6.2831853
Functions
void	xytopolar (flt, flt, flt, flt *, flt *)
void	xyztocyl (vector, flt, flt *, flt *)
void	xyztospr (vector, flt *, flt *)

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Define Documentation

#define TWOPI   6.2831853

Definition at line 64 of file coordsys.h.

Referenced by xytopolar(), xyztocyl(), and xyztospr().

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Function Documentation

void xytopolar	(	flt	,
		flt	,
		flt	,
		flt *	,
		flt *
	)

Definition at line 68 of file coordsys.cpp.

References TWOPI.

                                                        {
  flt r1;
  r1=x*x + y*y;  
  *v=sqrt(r1 / (rad*rad));
  if (y<0.0) 
    *u=1.0 - acos(x/sqrt(r1))/TWOPI;
  else 
    *u= acos(x/sqrt(r1))/TWOPI; 
}

void xyztocyl	(	vector	,
		flt	,
		flt *	,
		flt *
	)

Definition at line 78 of file coordsys.cpp.

References TWOPI, vector::x, vector::y, and vector::z.

Referenced by cyl_checker_texture(), and image_cyl_texture().

                                                        {
  flt r1;

  r1=pnt.x*pnt.x + pnt.y*pnt.y;

  *v=pnt.z / height;
  if (pnt.y<0.0) 
    *u=1.0 - acos(pnt.x/sqrt(r1))/TWOPI;
  else 
    *u=acos(pnt.x/sqrt(r1))/TWOPI;
}

void xyztospr	(	vector	,
		flt *	,
		flt *
	)

Definition at line 90 of file coordsys.cpp.

References TWOPI, vector::x, vector::y, and vector::z.

Referenced by image_sphere_texture().

                                            {
  flt r1, phi, theta;
 
  r1=sqrt(pnt.x*pnt.x + pnt.y*pnt.y + pnt.z*pnt.z);

  phi=acos(-pnt.y/r1);   
  *v=phi/3.1415926;

  theta=acos((pnt.x/r1)/sin(phi))/TWOPI;

  if (pnt.z > 0.0) 
    *u = theta;
  else 
    *u = 1 - theta; 
}