when you have quadratiic bezier curve you got three points say P0, P1, P2

P0 and P2 are the edges of the curve but P1 do not lay on the curve but

lines P0-P1 and P1-P2 are making some kind of "roof" for that bezier curve

when i got bezier path i understand that I got 9 control points, I can imagine

4 curves making the 4 edges ot patch - the corresponding pairs of points on

those edges i could use to make the inner parts of the this patch but I also

needthe inner 'roof' points for eachof the pair

I got 5 roof points (4 for edges and 1 central points) Is this true that the

'roof points' I need as a control points would be laying on the lines which are

make from those 5 roof points?

check out for drawings on

http://www.gamedev.net/page/resources/_/technical/math-and-physics/bezier-patches-r1584

I hope it is managable to understand what I am asking about.. I would like

to imagine a process of quadratic bezier path creation - to make this I belive

I need infinity of pairs of edge points (edge points I can get from simple

bezier curves of edges) and also inifinity of 'roof' contraol points - and I am

not sure how to make, imagine where lays this control points

(I also assume that infinity of bezier curves made in u direction and inifinity

of bezier curves made in v direction will cover exactly the same points - but this

is probably true - is this?)

thanx for answer