Re: "RendererVector must be empty"

Hi Paul,

Don Murray is right, you must You must add ScalarMaps before 
adding references. 

This includes all ScalarMaps for all the data you wish to
draw on the same display. That is, if you are drawing multiple
data on the same display (by overlaying), you must "manange" the
timing of the rendering either by (1) manaing the ScalarMaps used,
or (2) posponing calling the display.addReference() or 
display.addReferences() until the last minute. The latter
is the easiest.

cheers

Ng Say Teong