[Insight-developers] Image as an OrientedImage Progress

Bill Lorensen bill.lorensen at gmail.com
Tue Sep 16 16:50:47 EDT 2008


We need an N-D solution I think. Having a separate spatial dimension
for coordinates and directions may be viable.

Let's keep discussing and thinking...

On Tue, Sep 16, 2008 at 3:42 PM, kent williams
<norman-k-williams at uiowa.edu> wrote:
> A more expedient question: Does it really make any sense to throw an
> exception for degenerate 2D direction cosines. In those cases where valid 3D
> dir cosines are truncated to degenerate 2D dir cosines, there's no valid
> punt option, categorically:
>
> If you see dir cosines of [0 1] [0 0] or [0 0] [0 1] etc, what that means is
> the second fastest moving direction is going in either the Z or -Z
> direction.  You can cange them to e.g. [0 1] [1 0] or [0 1] [-1 0], which
> will remove the degeneracy, but be 100% wrong.
>
>
>
> On 9/16/08 10:58 AM, "Bill Lorensen" <bill.lorensen at gmail.com> wrote:
>
>> As I said, although the issue has been known for some time, now is the
>> time to attack it. We need some thought time on this one.
>>
>> For now, we'll just let the tests keep failing. One platform in the
>> nightly is enough to keep us reminded.
>>
>> Bill
>>
>
>


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