> I'm told by a colleague who really does know how to do this that "his
> favorite
> way" to do rotations is to use quaternions. See
>
> http://en.wikipedia.org/wiki/Quaternions_and_spatial_rotation
>
> Does this help?
I know that quaternions are a contraversial subject. As I understand it,
some
> matrix inversion. (This is a 4x4 translation matrix, right?)
yes, 4x4.
> A^-1 * A = I
>
> so
>
> A^-1 * A * ? = A^-1 * B
>
> ? = A^-1 * B
>
> I think, anyway. The inverse is trivial to write. Almost no calculation.
If that is all it is then that is great.
Matrix multiplication is not commuta
I'm told by a colleague who really does know how to do this that "his favorite
way" to do rotations is to use quaternions. See
http://en.wikipedia.org/wiki/Quaternions_and_spatial_rotation
Does this help?
Bob
Miguel wrote:
I'm volunteering, but I need a very specific goal. Exactly what is
being
a
matrix inversion. (This is a 4x4 translation matrix, right?)
A^-1 * A = I
so
A^-1 * A * ? = A^-1 * B
? = A^-1 * B
I think, anyway. The inverse is trivial to write. Almost no calculation.
See
http://www1.cs.columbia.edu/~allen/F03/NOTES/frames.pdf
http://www1.cs.columbia.edu/~allen/F03/NOTES/equivax
>> I'm volunteering, but I need a very specific goal. Exactly what is
being
>> asked?
>> Are we trying to do smooth animation or a sudden jump? Does the current
user-influenced rotation status need to be a starting point? (Miguel,
have you
>
> An elegant and smooth rotation from the current positio
According to Bob Hanson:
> I'm volunteering, but I need a very specific goal. Exactly what is being asked?
> Are we trying to do smooth animation or a sudden jump? Does the current
> user-influenced rotation status need to be a starting point? (Miguel, have you
An elegant and smooth rotation fro
Miguel wrote:
As long as Jmol knows internally the coordinates and position for every
element, it should be possible for Jmol, by receiving the info on
"TYR 97, Chain A, Model 1", to rotate the model if needed and to
locate, in the center of the applet, the residue pointing to the user.
Is there
Jaim wrote:
> Take a look to http://bip.weizmann.ac.il/oca-docs/jmoltest/jmol3.html
>
> Now, lets say that I want to bring the attention of the user to a
> residue that's at this very moment on the other side of the molecule:
> TYR 97, Chain A, Model 1. It's colored red, part of a group of
> three
Take a look to http://bip.weizmann.ac.il/oca-docs/jmoltest/jmol3.html
Now, lets say that I want to bring the attention of the user to a
residue that's at this very moment on the other side of the molecule:
TYR 97, Chain A, Model 1. It's colored red, part of a group of
three or four.
You may see
