/* You can cut and paste this into Povray */

#macro Arrow (START, END) /* defines the start of a macro */
        /* change these to suit your scale and taste
            these will be the common measurements of every arrow */
 #local Arrow_Head_Length = .8;
 #local Arrow_Head_Radius = .3; // large radius of cone
 #local Arrow_Shaft_Radius = .15;
        /* end change these to suit your scale and taste */

 #local Arrow_Vector = END - START; /* defines the direction in which the
arrow is pointing */
 #local Shaft_Meets_Head = END - vnormalize (Arrow_Vector) *
Arrow_Head_Length;
        /* vnormalize takes the direction of the arrow and makes its length
equal to 1
            multiplying this by the length of the arrowhead and subtracting
it  from the end
            leaves room for the arrowhead */

 cylinder {START, Shaft_Meets_Head, Arrow_Shaft_Radius} /* this is the shaft
*/
 cone {Shaft_Meets_Head, Arrow_Head_Radius, END, 0} /* this is the head */
#end // #macro Arrow (START, END) /* this is the end of the macro */


union {Arrow (<-1,0,0>, <1,0,0>) pigment {rgb 1}}
        /* call the macro inside a union statement so you can add your
textures and transformations */

/* hope this helps    -Shay */

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