Hi all,

I noticed that with the ribbons engine, the cool backbone spline

Marcus did wasn’t going all the way to the ends. The first 2 segments

and the last 2 were not showing up. on big protein it’s not too

noticeable but on the smaller ones it is. With Marcus’ help I think I

figured out the problem. In a nurb you want to have the number of

knots be equal to the number of control points + order. In the case of

our spline the control points are the locations of the backbone atoms

and the order is 4 (cubic + 1). Now the trick was to not have extra

endpoints at the same location to end the spline but to rather have a

knot multiplicity equal to the order. So the first 4 and last 4 knots

should have the same value. The rendering is not very smooth at the

end and I’m not sure if something can be done about that but we at

least are rendering a spline for all the atoms in the backbone. Now

that I know more about nurbs than I ever wanted to, thanks Wikipedia,

I’m moving on to adding also using the nitrogens in the backbone for

the ribbon.

-Jordan

–

“That’s all very well in practice, but will it ever work in theory?” – G. Hill

"A tidy laboratory means a lazy chemist." – Jöns Jacob Berzelius