plot 3 line to connect a value on surface

I want to plot corresponding 3 line that connect marked (Red star) value (4,87,34) to net power, mass flow and thickness.

Thanks in advance

Answer 1

[KSSV]

YOu may follow something like this:

[X,Y,Z] = peaks(50) ; 
% Pick a point
[val,idx] = max(Z(:)) ;
P = [X(idx) Y(idx) Z(idx)]'  ;

figure
hold on
% waterfall(X,Y,Z)
plot3(X,Y,Z,'.b')
plot3(P(1),P(2),P(3),'*r')

L1 = [P  [X(idx) Y(idx) 0]'] ; 
L2 = [P  [X(idx) 0 Z(idx)]'] ; 
L3 = [P  [0 Y(idx) Z(idx)]'] ; 

plot3(L1(1,:),L1(2,:),L1(3,:),'r')
plot3(L2(1,:),L2(2,:),L3(3,:),'r')
plot3(L3(1,:),L3(2,:),L3(3,:),'r')