[ quesa-Bugs-909213 ] SetRotateVectorToVector problem

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Bugs item #909213, was opened at 2004-03-03 17:56
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Tom Sanham (tomsanham)
Assigned to: Nobody/Anonymous (nobody)
Summary: SetRotateVectorToVector problem

Initial Comment:
Some input values for 
Q3Quaternion_SetRotateVectorToVector produce duff 
quaternions.

Example:

start vector:
-0.2252647,-0.8941119,-182972.5

put through Q3Vector3D_Normalize gives
-1.231140e-6,-4.886592e-6,-1

Now do Q3Quaternion_SetRotateVectorToVector with 
the following parameters:
v1=-1.231140e-6,-4.886592e-6,-1
v2=0,0,1

the resulting quaternion is (0,-INF,INF,NAN)

This problem occurs on Mac OS X Quesa, I am unable to 
reproduce it on Windows.

To workaround this case, I just detect magnitudes <1e-
5 and set them to 0, and hence v1 becomes 0,0,-1, 
which then works correctly.

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