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two surfaces on same plot? [message #13209]

Thu, 22 October 1998 00:00

woodford
Messages: 10
Registered: June 1996

Junior Member

I am reading Struan Gray's tutorial on plotting multiple surfaces at
http://www.sljus.lu.se/stm/IDL/Surf_Tips/. I was attempting to do a
simple plot with two intersecting surfaces in it, using code similar to
what he has on his page:

surfone = shift(dist(20,16), 10, 8)
surfone = bytscl(exp(-(surfone/5)^2))
surftwo = bytscl(fix(shift(surfone, 6, 0)) + shift(surfone, -6, 0))/2b
shade_surf, surfone
shade_surf, surftwo, /noerase

However, the second shade_surf erases the first. Is it not possible to
plot them both unless you are using the z buffer? I am just trying to
plot to a window on the screen. I am using IDL 4.0.1 and 5.0.2 on a
PowerMac.

--
Paul Woodford, Ph.D.
woodford@essexcorp.com
301-953-8855

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