res = 254 / in
v = callJava["frink.graphics.VoxelArray", "makeSphere", [1/2 inch res]]

v.projectX[undef].show["X"]
v.projectY[undef].show["Y"]
v.projectZ[undef].show["Z"]

filename = "sphere.stl"
print["Writing $filename..."]
w = new Writer[filename]
w.println[v.toSTLFormat["sphere", 1/(res mm)]]
w.close[]
println["done."]