3d surfaces for Maple compatibility plot3d

plot3d takes three arguments : a function of two variables or an expression of two variables or a list of three functions of two variables or a list of three expressions of two variables and the names of these two variables with an optional range (for expressions) or the ranges (for functions).
plot3d(f(x,y),x,y) (resp plot3d([f(u,v),g(u,v),h(u,v)],u,v)) draws the surface z = f (x, y) (resp x = f (u, v), y = g(u, v), z = h(u, v)). The syntax plot3d(f(x,y),x=x0..x1,y=y0..y1) or plot3d(f,x0..x1,y0..y1) specifies which part of surface will be computed (otherwise default values are taken from the graph configuration).
Input :

plot3d(x*y,x,y)

Output :

The surface z = x*y

Input :

plot3d([v*cos(u),v*sin(u),v],u,v)

Output :

The cone x = v*cos(u), y = v*sin(u), z = v

Input :

plot3d([v*cos(u),v*sin(u),v],u=0..pi,v=0..3)

Output :

A portion of the cone x = v*cos(u), y = v*sin(u), z = v