[R] RGL- Drawing Circle

[gli]

thanks Duncan.  I think want my circle to be in user coordinates.  I tried
the first code u gave me and it gives me a circle. but how can i: 

1) change the radius ?

2) place the circle at a given x,y,z coordinate?

3) turn it 90 degree up like these circle plate bus stop?
http://www.geocities.co.jp/yuganatabi/bus-stop-aba.html

4) and finally, set the orientation angle of the circle plate?

grateful if u give me some directions or at least let me know if it is
possible or not.

graham

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