eval3dp - compute facets of a 3D parametric surface

Calling Sequence

[Xf,Yf,Zf]=eval3dp(fun,p1,p2)

Parameters

• Xf,Yf,Zf : matrices of size (4,n-1*m-1). Xf(:,i) ,Yf(:,i) and Zf(:,i) are respectively the x-axis, y-axis and z-axis coordinates of the 4 points of the ith four sided facet.
• fun : a Scilab function.
• p1 : a vector of size n.
• p2 : a vector of size m.

Description

eval3dp computes a four sided facets representation of a 3D parametric surface defined by the function fun. fun(p1,p2) computes the x-axis ,y-axis and z-axis coordinates of the corresponding points on the surface, as [x(i),y(i),z(i)]=fun(p1(i),p2(i)). This is used for efficiency.

Examples

p1=linspace(0,2*%pi,10);
p2=linspace(0,2*%pi,10);
deff("[x,y,z]=scp(p1,p2)",["x=p1.*sin(p1).*cos(p2)";..
                            "y=p1.*cos(p1).*cos(p2)";..
                            "z=p1.*sin(p2)"])
[Xf,Yf,Zf]=eval3dp(scp,p1,p2);
plot3d(Xf,Yf,Zf)
 

See Also

genfac3d  plot3d