AddCylinder

NAME

AddCylinder - add cylinder for schematic drawing
SYNOPSIS

AddCylinder ( least_square | spacing )
DESCRIPTION

Add a cylinder that interpolates the selected atoms. The argument selects between two fit criteria. 'least_square' does a least square fit of the cylinder surface to the atoms. 'spacing' takes the axis direction that gives the most regular spacing of atoms. The results are normally very similar, but one may work better than the other if very few atoms are given.

A minimum number of atoms (5 for least_square, 4 for spacing) must be selected, otherwise the cylinder cannot be determined and an error message is issued.

Cylinders can be used for showing alpha helices in schematic drawings. For good results, it is recommended to either select the CA or all backbone atoms within a helix region.

EXAMPLE

AddCylinder
SEE ALSO

SelectAtom, ColorPrim, RemovePrim, AddRibbon

DATE

960307


Reto Koradi, kor@mol.biol.ethz.ch