在看ZEMAX中DLL文件夹中关于光栅的一个自定义文件，有一段是关于近轴光线追迹的，看的不是很懂，看看大家哪位懂点的给指点下：
case 4:
/* ZEMAX wants a paraxial ray trace to this surface */
/* x, y, z, and the optical path are unaffected, at least for this surface type */
/* for paraxial ray tracing, the return z coordinate should always be zero. */
/* paraxial surfaces are always planes with the following normals */
/* for paraxial ray tracing, grating effects are ignored */
/* this is exactly like the standard surface code */
UD->ln = 0.0;
UD->mn = 0.0;
UD->nn = -1.0;
power = (FD->n2 - FD->n1)*FD->cv;
if ((UD->n) != 0.0)
{
(UD->l) = (UD->l)/(UD->n);
(UD->m) = (UD->m)/(UD->n);
(UD->l) = (FD->n1*(UD->l) - (UD->x)*power)/(FD->n2);
(UD->m) = (FD->n1*(UD->m) - (UD->y)*power)/(FD->n2);
/* normalize */
(UD->n) = sqrt(1/(1 + (UD->l)*(UD->l) + (UD->m)*(UD->m) ) );
/* de-paraxialize */
(UD->l) = (UD->l)*(UD->n);
(UD->m) = (UD->m)*(UD->n);
}
break;
程序中红色部分不是很理解，里面的参数意义在h文件中有解释，我这里也截图，并附上附件
/* modified 7-16-2002 to support more parameters */
/* added FIXED_DATA3 2-1-2006 to support more data */
/* added #pragma 3-15-2007 to disable warnings about deprecated functions under VS 2005 */
#pragma warning ( disable : 4996 ) // functions like strcpy are now deprecated for security reasons; this disables the warning
typedef struct
{
double x, y, z; /* the coordinates */
double l, m, n; /* the ray direction cosines */
double ln, mn, nn; /* the surface normals */
double path; /* the path change */
double sag1, sag2; /* the sag and alternate hyperhemispheric sag */
double index, dndx, dndy, dndz; /* for GRIN surfaces only */
double rel_surf_tran; /* for relative surface transmission data, if any */
double udreserved1, udreserved2, udreserved3, udreserved4; /* for future expansion */
char string[20]; /* for returning string data */
}USER_DATA;
typedef struct
{
int type, numb; /* the requested data type and number */
int surf, wave; /* the surface number and wavelength number */
double wavelength, pwavelength; /* the wavelength and primary wavelength */
double n1, n2; /* the index before and after */
double cv, thic, sdia, k; /* the curvature, thickness, semi-diameter, and conic */
double param[9]; /* the parameters 1-8 */
double fdreserved1, fdreserved2, fdreserved3, fdreserved4; /* for future expansion */
double xdata[201]; /* the extra data 1-200 */
char glass[21]; /* the glass name on the surface */
}FIXED_DATA;
typedef struct
{
int type, numb; /* the requested data type and number */
int surf, wave; /* the surface number and wavelength number */
int unit; /* the unit flag */
double wavelength, pwavelength; /* the wavelength and primary wavelength */
double n1, n2; /* the index before and after */
double cv, thic, sdia, k; /* the curvature, thickness, semi-diameter, and conic */
int ireserved[20]; /* for future expansion */
double dbreserved[20]; /* for future expansion */
double param[51]; /* the parameters 0-50 */
double xdata[201]; /* the extra data 1-200 */
char glass[21]; /* the glass name on the surface */
}FIXED_DATA2;
typedef struct
{
int type, numb; /* the requested data type and number */
int surf, wave; /* the surface number and wavelength number */
int unit, serial; /* the unit flag and key serial number */
int is_a_mirror, is_in_mirror_space, is_air; /* flags that define the media */
int ireserved[100]; /* for future expansion */
int did_polar; /* indicates DLL provided polarization data */
int max_parameter, max_extradata; /* the number of parameters and extradata values */
double Exr, Exi, Eyr, Eyi, Ezr, Ezi, Ewr, Ewi; /* polarization data */
double dbreserved[100]; /* for future expansion */
double wavelength, pwavelength; /* the wavelength and primary wavelength */
double n1, n2; /* the index before and after */
double cv, thic, sdia, k; /* the curvature, thickness, semi-diameter, and conic */
double param[201]; /* the parameters 0-200 */
double xdata[501]; /* the extra data 0-500 */
char glass[200]; /* the glass name on the surface */
char comment[200]; /* the surface comment */
int *int_data; /* for future expansion */
double *db_data; /* for future expansion */
char *c_data; /* for future expansion */
}FIXED_DATA3;
发表于 2016-8-23 16:51
发表于 2018-3-28 11:16