combining a "mesh view" with a "surface view" of the same data

[Rupert Ford]

Hi,

Using the delaunaytest example as a guide I'm using a delaunaycustom to 
display the surface of a 3d unstructured mesh and a unionset of 
gridded3dset's to display the surface connectivity of the mesh. 
Separately these work fine. However when I try to display both the 
surface and the mesh connectivity (by having two separate 
datareferences) the mesh connectivity part gets very "patchy". Can 
anyone suggest a solution. Pictures of the surface, mesh, and 
surface+mesh views are attached.

Many thanks for any help.

-- Rupert
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