Help with plotting shape functions?

Hello, thanks for reading this,

I was wondering if you could help me with plotting shape functions. I have shape I want to graph in matlab, represented by the shape function:

   (pz*15*15*15+2*(px*px+2.25*py*py)*(px*px+2.25*py*py)<0)&&(px*px>0.01*15*15)&&    (pz>-2.3*15)

I got this, along with other shape functons, from some C++ code I inherited. I think if I can learn how to plot this, I can do the rest.

I started with trying to make a symbolic function out of this, defined by the code:

    syms px py px v

and to make a symbolic function:

    sym('v = ...')

I was thinking a ezplot may be the quickest way of doing this. However, I'm not sure how I would include the and operators, or even if symbolic equations are the best way of doing this problem.

Have any advice? Thanks

EDIT: I think a better way of saying this is I have a 3d volume I want to represent graphically, and I have a set of constraint equations associated with that 3D volume. I was wondering how I can represent my 3d volume given my set of constraint equations.

Answer 1

[Sean de Wolski]

I would skip the symbolic stuff and just use an isosurface.

doc isosurface

[Brian]

I'll take a look at isosurfaces. How could you model constraint equations as isosurfaces?

[Sean de Wolski]

I would generate it as a a bunch of 3d matrices using ndgrid() and then just evaluate that equation on those matrices.