let phi = theta = 0
while (phi < 3.14) {
  phi += 0.02
  theta += 0.79
  
  let x = 100 * cos(theta) * sin(phi)
  let y = 100 * sin(theta) * sin(phi)
  let z = 100 * cos(phi)
  
  curveVertex(x, y, z)
}

radius

maximum angle

phi step

theta step