How to determine the co-ordinates along the radius of a circle?

Hey guys,

am a newbie to 3D and just started building something,

Whats the easiest way to get the co ordinates along the radius of a circle?

i need them to place an asteroid field that occupies a portion of the radius of an orbit around a sun. ie: my field will occupy the area similar to a half of a donut.

are their are any classes to facilitate this type of thing?

the only way i can think of involves pythagoras and manipulating vectors, im sure their is a simpler way?

hm circle formular + distancevector + random varying vector

that pretty much as easy as it can get

I know in the beginning it is hard with vectors i learnd it in 9class myself to be able to write lua scripts for garrysmod ^^

But there are plenty ressources that help you learning it over the internet.

angle = random(0,2*PI)

x = cos(angle) * dist

y = sin(angle) * dist

http://en.wikipedia.org/wiki/Polar_coordinate_system

You can also vary dist a bit, otherwise the asteroids will be exactly on the circle

thanks guys i’ll need to look through this when am sober lol, ty v much allready a lot simpler than what i had envisioned, again cheers guys

Thanks for the link Momoko Fan answered all my questions on the subject

And yeah EmpirePhoenix for a newb vectors not easy to manipulate

Maybee it cheers you up to know, that once you understood them you have the advantage over most people that you can imagine them in a 3d space (as you learned them there and most learn them only in 2d on paper)