aven crashing when viewing 3D model of "flat" cave

[Jonny Prouty]

Hello all,

I created some fake data (included below) to try to determine if one of the
*units quantity types can be used to get survex to correctly read passage
LRUDs given in feet (no luck so far). As such I created 4 stations that end
up doing a 180 degree bend (horizontally), while inclination remained
constant at 0.

Cavern does not complain when I compile the svx file, nor does aven
complain when I open the 3D model and view it without passage tubes turned
on. As soon as I turn on passage tubes, however, aven throws an "Assertion
failed!" error and ultimately crashes.

If I change any of the clino measurements in the data, the passage tubes do
not cause aven any grief.

This isn't an issue for me as I don't have any real data that lacks
non-horizontal clino measurements, but I thought I'd send a quick note in,
regardless, in case it the issue manifests itself in other areas, as well.

I haven't attempted to reproduce the error in linux yet. I will send in
more info once I've been able to do so. Please let me know if there's
anything else you need.

Best regards,

Jonny

// BEGIN AVEN ERROR

Microsoft Visual C++ Runtime Library

Assertion failed!

Program: C:\Program Files (x86)\Survex\aven.exe
File: gfxcore.cc
Line: 2248

Expression: z_ext > 0.0

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts

(Press Retry to debug the application - JIT must be enabled)

// END AVEN ERROR

// BEGIN FAKE SURVEY DATA

*begin test
*units tape feet
*data normal from to tape compass clino
; set any of the clino smeasurements below to something other than
; zero and aven displays the passage tube without issue
; aven crashes when attempting to display the data as given below

1 2 11 0 0
2 3 11 90 0
3 4 11 180 0

*units LENGTH feet
*units COUNTER feet
*units COUNT feet
*units DEPTH feet
*units dX, dY, dZ feet

*data passage station left right up down

; station dimensions collected as feet during survey
; survex always treats them as meters, unfortunately
;1 5 5 5 5
;2 5 5 5 5
;3 5 5 5 5
;4 5 5 5 5

; station dimensions converted to meters
; passage tube is display at the correct size when using these values
1 1.524 1.524 1.524 1.524
2 1.524 1.524 1.524 1.524
3 1.524 1.524 1.524 1.524
4 1.524 1.524 1.524 1.524

*end test

// END FAKE SURVEY DATA

// BEGIN SYSTEM INFO

Windows 7 (build 11491769116007857, Service Pack 1), 64-bit edition
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// END SYSTEM INFO