How to draw a ball?

mushu · May 5, 2002, 5:58pm

I’m still new with Open GL, and I want to draw a ball.
Can anyone help me how to draw it? I can’t even draw a circle using glVertex2f. Do i really have to make a loop to generate points of a circle and join them together?

Help…

yakuza · May 5, 2002, 6:19pm

Perhaps this will help…
http://nehe.gamedev.net/tutorials/lesson.asp?l=18

Also, Gametutorials.com has a quadrics tutorial. http://www.gametutorials.com/Tutorials/OpenGL/OpenGL_Pg2.htm

mushu · May 5, 2002, 8:28pm

thanks for the link
I just remembered that I cannot draw a ball using auxsphere… the code must be made from scratch sob

endo · May 6, 2002, 5:33am

Its not that hard really, look into using quadric objects - they are really easy to understand

nexusone · May 6, 2002, 6:30am

Can you use the function gluSphere or glutSolidSphere?

The only other way that is from scratch would be to build it from vertex’s, if you do a search the code is here on this forum.
It has been asked in the past on building a sphere from scratch using sin/cos.

Originally posted by mushu:
thanks for the link
I just remembered that I cannot draw a ball using auxsphere… the code must be made from scratch sob

[This message has been edited by nexusone (edited 05-06-2002).]

mushu · May 6, 2002, 11:28pm

Thank you soo much I’ll try to do what you say. and no, I can not use any built in method to draw the sphere… it’s for an assignment… the teacher is really mean

mushu · May 7, 2002, 12:00am

just another question…
i found a site that has a code on how to draw a sphere… if anyone can help me, can you tell me what is PID2 ? Looks like a constant, but I can’t find it in math.h

btw, here’s the address http://astronomy.swin.edu.au/~pbourke/opengl/sphere/

Thanks beforehand

coredump · May 7, 2002, 2:42am

can you tell me what is PID2 ?

sounds like PI divided by 2

PI / 2 = 1.5707963

b