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Re: Showing the points on a surface about a circle in the plane


here is an example using a simple solution of building up the picture 

from several parts:


g1=Plot3D[fun1[x,y],{x,-1,1},{y,-1,1},ColorFunction\[Rule](Hue[1. #]&)]



g3=ParametricPlot3D[{r Sin[p],r Cos[p],0.01+fun1[r Sin[p],r 


Show[g1, Graphics3D [Thickness[0.01]], g2, g3]

as you will note, there is a problem with the visibiliyt of the 

projection of the circle onto the surface. Because of this, I drawed the 

projection slighlty (0.01) above the surface.If you want to look at the 

surface from below, you would better draw the projection slightly below 

the surface.


ahallam at wrote:

> What I would like to do with Plot3D and ParametricPlot3D is show a

> surface in three dimensions, a circle in the plane and the points on

> the surface above the circle.  This is what I have in mind where I

> have a square in the plane.  I simply don't know of a way to handle

> the circle.  If there were am ImplicitPlot3D, I can think so some

> options.


> I am not sure how to send code so that it is readable so I am simply

> pasting as is.


> Someone can yell at me and tell me this is wrong and how to do it

> correctly and then I will.



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