On 10/03/2018 03:58 AM, dick balaska wrote:
> On 10/02/2018 08:34 PM, Kenneth wrote:
> 
>> Long ago, I originally thought that a free-falling object needed all three
>> rotations to look natural. The idea seemed logical-- but the visual result
>> didn't bear that out (to my eyes, anyway.) I guess I could do a thorough
>> analysis of the applied 'vector forces' that cause an object to rotate in the
>> first place -- but that's a lot of work  ;-)  For now, I'm curious as to which
>> scheme you prefer, from a purely visual standpoint.
>>
> 
> My caboose landing is a 2 axis rotation. I'm not sure why I didn't even
> try 3, that would have made sense.
> 
> Your 3 axis, it looks like sometimes it changes direction while falling.
> 

Is this due "gimbal lock?"

Just me echoing what I've read, but I think you have to go to use 
Quauterions to avoid certain angle ambiguities.


was exposed to gimble lock on seeing a recent posting of yours. I've not 
gotten to testing the thought or reviewing your code though - and 
probably won't for a long while yet. Still occupied with solvers and 
related numerical methods.

Bill P.

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