question

You can test if a point is coplanar and within a projected rectangle using vector maths. The Vec3 type has all the vector operations needed for this.

Here's an example of how you might set up the needed variables for comparing a cuboid shape and network node (point) location (without solving it for you).

Object o=Model.find("Shape1");
Object n=Model.find("NN1");
Vec3 Aloc=o.getLocation(0,0,1).project(o.up,model());
Vec3 Bloc=o.getLocation(0,1,1).project(o.up,model());
Vec3 Cloc=o.getLocation(0,0,0).project(o.up,model());
Vec3 Dloc=o.getLocation(1,0,1).project(o.up,model());
Vec3 Nloc=n.getLocation(0,0,0).project(n.up,model());
Vec3 AN=Nloc-Aloc;
Vec3 AB=Bloc-Aloc;
Vec3 AD=Dloc-Aloc;
Vec3 AC=Cloc-Aloc;
double ANdotAC=AN.dot(AC);
double ANdotAB=AN.dot(AB);
double ANdotAD=AN.dot(AD);