Andy Ross writes:
> Again, this is an artifact of the primitive collision handling.
> Ideally, every contact point would test against all scenery polygons
> without a notion of "ground plane".  That's simple to imagine, but for
> performance reasons a little hard to implement.

Yes, the FDMs assume a "ground plane" but note a pointer to the 
SSG Entity intersected and the index to the triangle in that entity
are stashed in the hitlist after elevation determination.

Hence one can efficiently determine the local terrain's slope for the
Location queried.


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