ogc features over orthophoto over dem

I prototyped around a little bit adding also shapefiles to my testcase
and I must say: visad rocks!

I have huge performance problems, which I hope to resolve somehow later.

I put the resulting screenshot at:
I hope someone is interested in this first draft and has some ideas on
how to do things better. I welcome all critics (Don Murray, I wasn't yet
able to get things work following your advices, I will come back on that

I have a couple of rather different questions I would like to post, in
the hope they are not too scattered.

- in visad, is there some kind of caching system that gives the
possibility to work with huge files that can't be kept in memory? Kind
of tiling mechanism. LIDAR and friends are a now used reality, has
anyone experience?

- in the image I made the river with a Gridded3DSet. I'm not sure if
that is the proper way. Should I use some VisadLineArray?

- also, I had to elevate the river of some meter, since in certain parts
it went below the elevation model (which by the way is right, since the
river is made of coarser points as the dem and the lines in some parts
"intersect" the dem). Has anyone a better idea to overlay the shapefile 
over the dem?

- I tried to simulate a line with borders by painting a thinner after a
thicker one of different color. The result is weak as expected, is there
any way to do styling of lines (apart of dashing, which I read is

And last but not least (even if really not so important :)): 
- has anyone an idea about how to put a filled polygon over the dem? I
tried as a joke to do it with Delauny, but it doesn't permit 3D.
Perhaps the best would be to create an image and use it as a texture
over the dem and photo (does this last sentence make a sense?).

Thanks in advance for any comment.

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