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Changes between Initial Version and Version 1 of Ticket #477, comment 6

initial	v1
1		Changing the tangent for a single residue turns out to be difficult because we are using natural splines, which computes the tangents for all residues simultaneously to create a C2-continuous spline. Specifying additional constraints for the computation (e.g., tangent at residue X must be Y) changes the degrees of freedom. I think we only have 6 or 12 degrees of freedom to play right now, so at most two or hour residue tangents may be specified anyway.
	1	Changing the tangent for a single residue turns out to be difficult because we are using natural splines, which computes the tangents for all residues simultaneously to create a C2-continuous spline. Specifying additional constraints for the computation (e.g., tangent at residue X must be Y) changes the degrees of freedom. I think we only have 6 or 12 degrees of freedom to play right now, so at most two or four residue tangents may be specified anyway.
2	2
3	3	The alternative is to change how the ribbon is rendered. For example, instead of using a single spline for an entire chain, use a separate splines for non-tube sections of the chain. But that is a much larger undertaking.