There are plenty of castles available, but I'm looking for one particular
detail: a wall with glacis (or ladder-slider).   I don't even need the
entire castle, just an accurate or typical glacis.

(And before somebody else says it: No, a wall with contact lencis 
won't do!)

Have you considered a wall with lacis eye surgery?

(running away)

Ack! 

isn't that some sort of ice cream?..;)
Actually, the go-to person for castles would be Rodluc.

OK, I remember seeing Rodluc when I was looking through the
Mystic-Nights directory.  I'll go there again!

try Googling 'Vauban'...a 17th-Century French fort designer. I think part of his forts were called 'glacis', though it could be borrowed from an earlier term.

Sorry you hav'nt had any luck, so far, Ockham; but I do'nt know what it is your looking for, specifically, either?

The thing is, I'm not doing a medieval scene; just wanted to get a
good 3d sense of how a glacis was built, for a somewhat unrelated
modern project.  The picture of Rodluc's Neestrom castle gives me 
a  pretty good sense of the kind of slope that was used, but I'm not 
going to pay $20 for it just to play around!

I'm confused a bit also....I always thought it was a sloping of the ground from a wall...... hmmmm......

Yes, it is the slope.... main purpose was to make it hard for
invaders to get a ladder or scaffold up to the wall.

That's why I called it a ladder-slider.  I was hoping to approach
the subject from different angles in case there were different
terms, or in case I wasn't using the term properly.

I wanted to get a 3d look at the method or device, regardless
of what it was called.

What exactly are you making?
Site design and grading (in 3D) is one of the things i do for living... there's a minor chance I can give you some info, if I knew little more about what it is you were trying to create?

@Conniekat:  Not really making anything; just doing some casual historical "research",
if you could call it that.   Thanks for the offer anyway!

I can't help with 3D versions, but you could try looking for photographs of Badajoz and Ciudad Rodrigo, in western Spain.   Their fortifications are in the Vauban style, well post-mediaeval, but the glacis was integral to city fortifications at least up until 1914.   Both cities were (rather notoriously) stormed by the British Army in the Peninsular War of 1808-1814.   I believe that their walls were repaired subsequently.   At any rate, they both have very splendid fortifications today and, especially because they were significantly involved in the Peninsular War, they are much photographed.

Just up the road from Badajoz is Elvas, which also has impressive fortifications.   Badajoz is in Spain, Elvas in Portugal - hence the thick walls.

Another couple of use of the glacis at the foot of the wall were..makes wall effectively thicker at vulnerable base..makes it harder to use battering rams (they glance away)...any rocks, etc dropped from above will glance out into any troops near walls. All in all, they were a useful, relatively cheap method of adding extra protection at vulnerable spot.
 
Usually (in mid-to later medieval periods) they were stone faced faced butresses extending out from the base of castle walls..roughly at about 30-45 degrees. I think. in earlier periods, they they could be simply earthern walls..covered with thorn bushes and other nasties.