BEGIN {
particles	= 2000
startSmoke	= 0
x_origin	= 0
y_origin	= 0
z_origin	= 0
x_length	= 1
y_length	= 1
z_length	= 1
   
    # initialise the random number generator
    srand()

    for ( i = 1; i <= particles; i++ ) {
	# define the object
	object = "object01"
	printf( "  objectelement { \"eobject%d\" \"%s\"\n", i, object )

	# generate the position
 	x = x_origin + x_length * rand()
	y = y_origin + y_length * rand()
	z = z_origin + z_length * rand()
        
# place the object in position
printf( "    loc { (%f %f %f) }\n", x, y, z )

# create a track
printf( "      controller { \"position\"\n" )
printf( "        track {\n" )

 	# generate first frame position
startFrame = startSmoke + int(144 * rand())

# start frame
printf( "          pointkey { %d (%f %f %f) (0 35.343 0) (0 -35.343 0) \"?\" }\n", startFrame, x, y, z )

# key frame 2
printf( "          pointkey { %d (%f %f %f) (-1.6632 30.561 1.4553) (1.6632 -30.561 -1.4553) \"?\" }\n", 35+startFrame, x+10*(rand()-0.5), 70.686+y, z+10*(rand()-0.5))
	
	# key frame 3
printf( "          pointkey { %d (%f %f %f) (2.079 23.908 -2.9106) (-2.079 -23.908 2.9106) \"?\" }\n", 71+startFrame, x-6.6528+15*(rand()-0.5), y+122.25, 5.8212+z+15*(rand()-0.5))

	# key frame 4
printf( "          pointkey { %d (%f %f %f) (2.9106 23.493 -4.3659) (-2.9106 -23.493 4.3659) \"?\" }\n", 107+startFrame, x+8.316+20*(rand()-0.5), 166.32+y, -11.642+z+20*(rand()-0.5))

	# end frame
printf( "          pointkey { %d (%f %f %f) (-1.6632 24.948 0) (1.6632 -24.948 0) \"?\" }\n", 143+startFrame, 4.9896+x+25*(rand()-0.5), 216.22+y, -11.642+z+25*(rand()-0.5))

# close the track
printf( "        }\n" )

# close the position controller
printf( "      }\n" )

# the visibility controller
printf( "      controller { \"visibility\"\n" )
printf( "        track {\n" )

# initially invisible
if (startFrame > 0) 
            printf( "          booleankey { 0 0 \"?\" }\n" )

	# to avoid phantom-key problem
	if (startFrame > 98)
            printf( "          booleankey { 98 0 \"?\" }\n" )
printf( "          booleankey { %d 1 \"?\" }\n", startFrame )

# to avoid phantom-key problem
	printf( "          booleankey { %d 1 \"?\" }\n", 98+startFrame )
      
# hide at end of life
printf( "          booleankey { %d 0 \"?\" }\n", 143+startFrame )

# close the track
printf( "        }\n" )

# close the visibility controller
printf( "      }\n" )

# close the object element
printf( "    }\n" )
      }
}