coordsys.cpp File Reference

#include "machine.h"
#include "types.h"
#include "coordsys.h"

Include dependency graph for coordsys.cpp:

Go to the source code of this file.

Functions
void	xytopolar (flt x, flt y, flt rad, flt *u, flt *v)
void	xyztocyl (vector pnt, flt height, flt *u, flt *v)
void	xyztospr (vector pnt, flt *u, flt *v)

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Function Documentation

void xytopolar	(	flt	x,
		flt	y,
		flt	rad,
		flt *	u,
		flt *	v
	)

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	pnt,
		flt	height,
		flt *	u,
		flt *	v
	)

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	pnt,
		flt *	u,
		flt *	v
	)

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; 
}