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/** This generates a caltrops for 3-D printing. */
res = 254/inch // Resolution of model in voxels/inch
length = 1 inch // Leg length from center
baseRadius = .2 inch // Radius of base of leg
c = length res / sqrt[3] // Scaling factor to make voxels come out right
// The vertices of the tetrahedron. These need to be scaled by c.
// There are other ways of calculating the vertices. The angle between vertices
// is arccos[-1/3] or 109.47122063449 degrees.
vertices = [[1,1,1], [1,-1,-1], [-1,1,-1], [-1,-1,1]]
v = undef
// Make legs
for [x,y,z] = vertices
{
v2 = leg[x c, y c, z c, baseRadius res]
v = v2.union[v] // v is allowed to be null in which case v2 is copied
}
v.projectX[undef].show["X"]
v.projectY[undef].show["Y"]
v.projectZ[undef].show["Z"]
filename = "caltrops.obj"
print["Writing $filename..."]
w = new Writer[filename]
w.println[v.toObjFormat["v", 1/(res mm)]]
w.close[]
println["done."]
leg[tipx, tipy, tipz, baseRadius] :=
{
return callJava["frink.graphics.VoxelArray", "makeTaperedCappedCylinder", [0,0,0, tipx, tipy, tipz, baseRadius, 0]]
}
Download or view caltrops.frink in plain text format
This is a program written in the programming language Frink.
For more information, view the Frink
Documentation or see More Sample Frink Programs.
Alan Eliasen was born 19975 days, 2 hours, 53 minutes ago.