/** This makes an armillary sphere for 3-D printing. */

res = 254/in

ringHeight = 1 cm
ringOuterRadius = 3.5 in / 2
ringThickness = 2.4 mm
ring = callJava["frink.graphics.VoxelArray", "makeCylinder", [0, 0, 0, 0, 0, ringHeight res, ringOuterRadius res]]
ring2 = callJava["frink.graphics.VoxelArray", "makeCylinder", [0, 0, 0, 0, 0, ringHeight res, (ringOuterRadius-ringThickness) res]]
ring.remove[ring2]

tickHeight = 1.2 mm
tickRadius = .3 mm

textDepth = ringThickness/2
for angle = 0 to 350 step 10
{
   g = new graphics
   g.font["SansSerif", "bold", 1]
   g.text[angle, 0, 0]
   img = new image[g, undef, round[.4 ringHeight res]]
   x = ringOuterRadius cos[-angle deg]
   y = ringOuterRadius sin[-angle deg]
   text = callJava["frink.graphics.VoxelArray", "extrudeZ", [img, round[-textDepth res], round[textDepth res]]]
   text = text.rotateXYZ[0,0,0, 90 deg, 90 deg, (-angle + 90) deg]
   text.translate[round[x res], round[y res], round[ringHeight/2 res]]
   ring.remove[text]

   // Make ticks
   tick = callJava["frink.graphics.VoxelArray", "makeCappedCylinder", [x res, y res, ringHeight res, x res, y res, (ringHeight-tickHeight) res, tickRadius res]]
   ring.remove[tick]
   tick = callJava["frink.graphics.VoxelArray", "makeCappedCylinder", [x res, y res, 0, x res, y res, tickHeight res, tickRadius res]]
   ring.remove[tick]
}

v = ring

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

filename = "ArmillarySphere.obj"
print["Writing $filename..."]
w = new Writer[filename]
w.println[v.toObjFormat["armillary", 1/(res mm)]]
w.close[]
println["done."]