; This batch file defines variables used in the examples in 
; Chapter 11, "Plotting Multi-dimensional Arrays", of _Using IDL_.

; Restore cloud data into the IDL variables "clouds" and "rain".

RESTORE, FILEPATH('clouds3d.dat', SUBDIR=['examples','data'])

; Create the contour surface polygons (v and p) at density 0.1,
; from clouds. Show the low side.

SHADE_VOLUME, clouds, 0.1, v, p, /LOW

; Obtain the dimensions of the volume. Variables S(1), S(2),
; and S(3) now contain the number of columns, rows, and slices
; in the volume.

s = SIZE(clouds)

; Use SCALE3 to establish the three-dimensional transformation
; matrix. Rotate 45 degrees about the z-axis. 

SCALE3, XRANGE=[0,S(1)], YRANGE=[0,S(2)], ZRANGE=[0,S(3)], AX=0, AZ=45

; Render and display the polygons.

TV, POLYSHADE(v, p, /T3D)