contour plot 3-D acoustic cavity

in Matlab, how to plot the contour shape of the acoustic cavity. The figure is shown as follows.

there are coordinate (x, y, z) and the sound pressure p(x,y,z). p(x,y,z) is the function of coordinate (x,y,z).

Which command can be uesde for this plot?

Thank you for your help. Looking forward to your kind reply.

[KSSV]

How x,y,z is given? Any other data you have along with?

[johnson Shi]

x,y,z are given as array. And the pressure can be calculated with (x,y,z). so how can i plot this figure?