Always returns ZERO elevation when ID or drawing

[KPerison]

Hopefully someone can solve this.

I have a drawing that will always return a zero elevation (Z value) when ID'ing a geometry point (end, center, etc) of lines/polylines/etc regardless of whether they have a z-value other than zero.  This dwg will even disregard the elevation of selection points when drawing lines,etc. 

For example: This dwg has TINN lines extracted from a surface that clearly have endpt elevations greater than zero.

If I use the ID command to interrogate the endpoint of any of the TINN lines it returns 0.000 as the elevation.

If I draw a LINE from the endpoint of the two existing lines the new line is drawn at elevation zero.

Can someone pls explain why this is happening? Is there a system variable that is preventing this dwg from using the selected Z values?

😁Mid post update: SOLVED!!!

Have determined that this is a result of a Profile setting.

Un-check: Replace Z value with current elevation

[wfberry · Accepted solution]

Your explanation is not exactly correct.  What you have highlighted is the command line OSNAPZ command.  It tells me that the ids of the first picture were from line "snaps" to endpoints with the OSNAPZ set to 1.  (I may have this backwards.)

Bill

[KPerison]

Yes, you are correct. The profile setting I highlighted maps to the setvar: OSNAPZ.

Value   Description

0	Osnap uses the Z-value of the specified point
1	Osnap substitutes the Z-value of the specified point with the elevation (ELEV) set for the current UCS

30yrs of AutoCAD and there's still more to learn.

I don't know if I should be amazed or depressed about that! 😀

[AllenJessup]

ELEVATION is another SYSVAR

Although OSNAPZ was the cause in this case. I've seen instances where there were duplicate lines. One at elevation and one at zero. ID or any command using the Endpont snap will return the zero elevation.