Problem Drawing A Sphere In Opengl Es

I've been trying to create my own sphere using OpenGL ES and I followed the math described here http://www.math.montana.edu/frankw/ccp/multiworld/multipleIVP/spherical/learn.htm Ho

Solution 1:

Change this

for(double phi = -(Math.PI/2); phi <= Math.PI/2; phi+=dPhi)

to this

for(double phi = -(Math.PI); phi <= Math.PI; phi+=dPhi)

Solution 2:

Actually, changing

for(double phi = -(Math.PI/2); phi <= Math.PI/2; phi+=dPhi)

to

for(double phi = -(Math.PI); phi <= 0; phi+=dPhi)

is enough. With phi from -(Math.PI) to +(Math.PI) you are making 360 degrees turn and counting each point twice. You can also do:

for(double phi = -(Math.PI); phi <= Math.PI; phi+=dPhi) {
     for(double theta = 0.0; theta <= (Math.PI); theta+=dTheta) {
     ... 
     }
}

to avoid counting twice.