How to draw a cone correctly to form an arrow in VMD ?

vitalys · 发表于 Post on 2023-9-14 01:18:50

If you please, i would like to know if there is a rule to draw a cone along with a cylinder to draw an arrow, because i draw the cylinder and the cone easily using the following commands: draw cylinder {xyz} {x'
y ' z'} <radius> value resolution <value>
draw cone {xyz} {x' y' z'} <radius> value resolution <value>
But i always get a distorted arrow (please see attached image). The cylinder is fine to draw, but i failed to draw the cone directly Adhesive to cylinder.

sobereva · 发表于 Post on 2023-9-14 02:51:49

This is my script defining "drawarrow" command, you can consult its content

drawarrow.tcl (981 Bytes, 下载次数 Times of downloads: 2)

This command is used by an example of Multiwfn program manual to draw dipole moment vector of two molecules and the whole system:

vitalys · 发表于 Post on 2023-9-14 20:07:06

sobereva 发表于 2023-9-14 02:51
This is my script defining "drawarrow" command, you can consult its content

Thank you very much, but what i don't understand is how to determine the coordinates (endx2 endy2 endz2) ? I know that (endx1 endy1 endz1) are the same for the cylinder and the cone.

sobereva · 发表于 Post on 2023-9-14 20:36:27

vitalys 发表于 2023-9-14 20:07
Thank you very much, but what i don't understand is how to determine the coordinates (endx2 endy2 ...

Assume that unit vector of the cylinder is u and the cylinder has length of k, and the beginning point of the cone is a, then the ending point of the cone should be a+0.1*k*u

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[VMD] How to draw a cone correctly to form an arrow in VMD ?

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