Using the unions declared below, the translate's of the form

translate *x *y *z

work as expected, however, the

translate <x y z>

does not translate correctly in the -z direction, instead it acts like a -y
translate.

Any answers to why this might be happening?
Thanks in advance,
Brett

<code snippet>
#declare wing_bone = union
{
cylinder {  < 0, -6.0, -1.5>,  < 0, -4.0, -0.5>, 0.2 }
cylinder {  < 0, -4.0, -0.5>,  < 0, -2.0, -0.0>, 0.2 }
cylinder {  < 0, -2.0,  0.0>,  < 0,  2.0,  0.0>, 0.2 }
cylinder {  < 0,  2.0, -0.0>,  < 0,  4.0, -0.5>, 0.2 }
cylinder {  < 0,  4.0, -0.5>,  < 0,  6.0, -1.5>, 0.2 }
}

#declare wing = union
{
 object { wing_bone scale <1.0 0.4 1.0> translate -6*x -3.0*z }
 object { wing_bone scale <1.0 0.6 1.0> translate -4*x -2.0*z }
 object { wing_bone scale <1.0 0.8 1.0> translate -2*x -1.0*z }
 object { wing_bone scale <1.0 1.0 1.0> }
 object { wing_bone scale <1.0 0.8 1.0> translate  2*x -1.0*z }

//object{wing_bone scale <1.0 0.4 1.0> translate <-6.0 0.0 -3.0>}
//object{wing_bone scale <1.0 0.6 1.0> translate <-4.0 0.0 -2.0>}
//object{wing_bone scale <1.0 0.8 1.0> translate <-2.0 0.0 -1.0>}
//object{wing_bone scale <1.0 1.0 1.0> translate < 0.0 0.0  0.0>}
//object{wing_bone scale <1.0 0.8 1.0> translate < 2.0 0.0 -1.0>}
}   

object { wing texture { pigment { color White } } }               
<end code snip>

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