It would really help if you would give some more information about what 
you're trying to achieve. Do you want an arrow as a 3D-object, 
2D-object, on a texture, how should it look, etc.

Now I can only guess, so here's one (propably the simplest) way to 
create a 3D arrow:

union {
	cylinder { <-5,0,0>,<0,0,0>,1 }
	cone { <0,0,0>,2,<3,0,0>,0 }
	pigment { rgb<1,0,0> }
}


HTH,
Florian

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