[pstricks] I need a little help

[Leon Free]

Le 18/12/2012 23:12, Cyrille Piatecki a écrit :
> 
> 4) How to construct really the green curve on the curvature of the curev ?
> Thanks to anybody who could help me.
> 

I'm not sure what this curve is. If you project this green line on the
(x,y) plane, would you get a straight line trough (x_0,y_0) and
(x_1,y_1) ? If yes, use a parametric plot (see pst-solides3d doc which
includes examples on how to do that) with
u varying in (x_0,x_1)
v=y_0+(u-x_0)*(y_1-y_0)/(x_1-x_0)
w=-((u-4)^2+(v-4)^2)*0.2+10

LF