Hi, I am having problem with UDF.I am doing a simulation of moving bodies.I need help for that.Can anybody help me to programme UDF.I know nothing is free in this world.I am willing to pay for the help.

Compile Define Zones

Here an UDF example:

#include <stdio.h> #include <math.h> #include "udf.h"

# define UDF_FILENAME "udf_velocity"

DEFINE_CG_MOTION(disk, dt, cg_vel, cg_omega, time, dtime) { real velo,a,b,f,x,s1,t1,t2;

/* reset velocities */ NV_S (cg_vel, =, 0.0); NV_S (cg_omega, =, 0.0);

/* motion */ a = 0.25; /* amplitude */ f = 0.1; /* frequency */ b = 2.0 * 3.1416 * f; /* angular frequency */

s1 = 0.4; /* distance */ t1 = s1 / (a * b); /* time */

if(time < t1) /* process */ {

x = s1 * time / t1;

velo = a * b; } else /* sine motion */ {

t2 = time - t1;

x = a * sin(b * t2) + s1;

velo = a * b * cos(b * t2); }

/* set x-component of velocity */ cg_vel[0] = velo;

/*Message ("\nUDF disk: dt = %f, cg_vel = %f, cg_omega = %f, time = %f, dtime = %f, dt0 = %f, dt1= %f\n",

dt, cg_vel[0], cg_omega[0], time, dtime, dt[0], dt[1]);*/

/*Message ("\n\nUDF disk: dt = %f", dt);*/ Message (" cg_vel = %f", cg_vel[0]); /* C.G. linear velocity */ Message (" cg_omega = %f", cg_omega[0]); /* C.G. angular velocity */ Message (" time = %f", time); /* total time */ Message (" dtime = %f", dtime); /* time step size */ Message (" x = %f\n", x); /* x motion */