[Octave-bug-tracker] [bug #65641] 'view' produces incorrect viewpoint when given a vector aligned with the X axis

[Nicholas Jankowski]

Follow-up Comment #2, bug #65641 (group octave):

for the 3 cases, the output of 
[az, el] = cart2sph (x(1,x(2),x(3));
az *= 180/pi;


x = [0 -1 0]
az = -90
el = 0

x = [1 0 0]
az = 0
el = 0

x = [1 0.001 0]
az = 0.05726
el = 0



after that calculation, view applies:
 if (az != 0)
   az += 90;  # Special fix for bug #57800
 endif

resulting in:


x = [0 -1 0]
az = 0
el = 0

x = [1 0 0]
az = 0
el = 0

x = [1 0.001 0]
az = 90.057
el = 0


matlab 2023b produces the same output from cart2sph, but view([1,0,0]) does
result in a view of the short (5) wide ellipse section:


>> view([0,-1,0])
>> [az,el]=view
az =
     0
el =
     0
>> view([1,0,0])
>> [az,el]=view
az =
    90
el =
     0
>> view([1,0.001,0])
>> [az,el]=view
az =
   90.0573
el =
     0


so it seems the bug #57800 fix isn't quite hitting the mark.



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