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Old   December 6, 2007, 04:00
Default UDF
  #1
James
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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.
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Old   December 6, 2007, 12:22
Default Re: UDF
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SMF_MS
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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 */
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