[postgis-users] 3d support in postgis

[Wolfgang Bär]

hi everyone,

i have a question regarding the 3d support in postgis.

are 3d object indexed with the complete boundingbox, which means the 
search for overlaps also test for overlapping in the z coordinate 
during index lookup?

in the faq of the postgis manual in question 5 it is said - use the 
truly_inside function for the search for object really inside the 
search box - but this function only tests the x and y coordinate and 
ignores the z coordinate which will result in wrong results when 
dealing with 3d data.

does anybody knows if the gist-index operates with the z coordinate
and only some functions are not extended to 3d at this time !

thanks for any help,

bye wolfgang