eval3dp

compute facets of a 3D parametric surface

Calling Sequence

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

Arguments

: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.

Sample

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 Compute facets of a 3D surface
• plot3d 3D plot of a surface