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Re: Problem with z-buffering using IDLgrPolygon [message #30392] Fri, 26 April 2002 08:51
Karl Schultz is currently offline  Karl Schultz
Messages: 341
Registered: October 1999
Senior Member
"Mira Michelle Raman" <ramanm@ninds.nih.gov> wrote in message
news:3CC9A3DD.A3511B3E@ninds.nih.gov...
> Hi,
> I am trying to write a program in which an IDLgrVolume and an
IDLgrPolygon are displayed such that the polygon appears to wrap around the
volume, and when the polygon is moved, the lines and
> vertices obstructed by the volume should become hidden. The problem I am
having is that the vertices that should be hidden are visible, making it
appear as if the polygon is out in front of the
> volume. The following example program illustrates my problem. (The left
mouse button drags the polygon and the right button drags volume & polygon
together). Any suggestions would be greatly
> appreciated.
> -Mira

All you have to do is specify the ZBUFFER keyword on IDLgrVolume.
Otherwise, IDLgrVolume does not modify the Z buffer.

Karl

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