Plot 3D mode vectors in VMD
From Computational Biophysics and Materials Science Group
######################################### ## Description: TCL script for drawing mode vectors as arrows considering contribution from each modes ## Author: Kevin May 2014 ## Usage: source draw_modes.tcl ## Input: idv.dat (individual contribution of modes) ## vec.dat (mode vectors) ## .xyz (coordinate of CG sites at the frame you interested, usually the last) ## Output: graphical plots ## Units: ## Other Notes: ######################################### proc vmd_draw_arrow {mol start end} { # an arrow is made of a cylinder and a cone set middle [vecadd $start [vecscale 0.9 [vecsub $end $start]]] graphics $mol cylinder $start $middle radius 0.35 graphics $mol cone $middle $end radius 0.55 } set natoms 40 set nmodes 8 for {set i 1} {$i <= $natoms} {incr i} { set fi [open "idv.dat" r] set ff [open "vec.dat" r] set fc [open "unsym+last.xyz" r] set nlines 1 set sumv [veczero] for {set nlines 1} {$nlines <= [expr $natoms*$nmodes]} {incr nlines} { if {$nlines<=$i} {gets $fc start} gets $ff vector if {[expr ($nlines-$i)%$natoms] != 0} {continue} if {[expr ($nlines-$i)%$natoms] == 0} { gets $fi idv set vector [vecscale $vector $idv] set sumv [vecadd $sumv $vector] } if {[expr ($nlines-$i)/$natoms+1]==$nmodes} {set sumv [vecscale $sumv 200]} set end [vecadd $start $sumv] draw color ochre #puts "$i $nlines $idv $start $end" draw arrow $start $end } }