function [] = circleagain(a,b,c,r)

pixel = 0.1

theta1 = 0

theta2 = 360*pi/180

pix = pixel/r

theta = theta1:pix:theta2

global x y z

x = a + r*cos(theta)

y = b + r*sin(theta)

z = ones(1,length(x))*c

x=round(x*10)/10

y=round(y*10)/10

z=round(z*10)/10

plot3(x,y,z, c )