# Changing bond order does not adjust H count properly **URL:** \ **Category:** Support\ **Created:** [August 27, 2022, 1:03pm UTC](https://discuss.avogadro.cc/t/changing-bond-order-does-not-adjust-h-count-properly/3944 "2022-08-27T13:03:17Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![seal](https://discuss.avogadro.cc/user_avatar/discuss.avogadro.cc/seal/32/1234_2.png) [@seal](https://discuss.avogadro.cc/u/seal)\ **Post date:** [August 27, 2022, 1:03pm UTC](https://discuss.avogadro.cc/t/changing-bond-order-does-not-adjust-h-count-properly/3944/1 "2022-08-27T13:03:17Z")
I believe this to be a bug with Avogadro ## Environment Information Avogadro version: 1.97.0 shader build Operating system and version: macOS 12.5.1 ## Expected Behavior Start with ![image](https://discuss.avogadro.cc/uploads/default/original/2X/d/d853f4e5cbe472a12207c9bb0a7d3453f7f12b3d.jpeg) I want to change the C-C single bond (upper right) to a double bond. I try to do it two ways: Click on a bond: ![image](https://discuss.avogadro.cc/uploads/default/original/2X/f/f3e8817ee647861caa06e02899ce0e55c498cb83.jpeg) Or select ![image](https://discuss.avogadro.cc/uploads/default/original/2X/1/1050c3339d60dbf8951d06a5fd8e0fd6d00c8ba5.png) And clicking on one atom drag to another: ![image](https://discuss.avogadro.cc/uploads/default/original/2X/a/a41a6e3be655c424cc78f633fefc7524a1acdea4.jpeg) That said, if I click on a bond and then clicking one and dragging to another, I do get the right thing: ![image](https://discuss.avogadro.cc/uploads/default/original/2X/0/094894e499b6372ee519494057f9acc41f1d04f8.jpeg) ---
**Author:** ![seal](https://discuss.avogadro.cc/user_avatar/discuss.avogadro.cc/seal/32/1234_2.png) [@seal](https://discuss.avogadro.cc/u/seal)\ **Post date:** [August 27, 2022, 1:06pm UTC](https://discuss.avogadro.cc/t/changing-bond-order-does-not-adjust-h-count-properly/3944/2 "2022-08-27T13:06:26Z")
Actually, there’s another thing – I can’t optimize this structure: ![image](https://discuss.avogadro.cc/uploads/default/original/2X/2/2d89ac3edce9dd8d097cd9aaa22fe2c1214c1e0f.png) For reference, the force field is set to “forcefields”. But this could be part of the update to force fields that you’ve mentioned elsewhere. ![image](https://discuss.avogadro.cc/uploads/default/original/2X/b/b09e88c88d8c444bfd1b99ec5003abe690aa0ec5.png) ---
**Author:** ![ghutchis](https://discuss.avogadro.cc/user_avatar/discuss.avogadro.cc/ghutchis/32/456_2.png) [@ghutchis](https://discuss.avogadro.cc/u/ghutchis)\ **Post date:** [August 27, 2022, 3:23pm UTC](https://discuss.avogadro.cc/t/changing-bond-order-does-not-adjust-h-count-properly/3944/3 "2022-08-27T15:23:34Z")
I don’t know which build you’re using - I’m pretty sure the hydrogen bug was fixed [recently](https://github.com/OpenChemistry/avogadrolibs/pull/1112). I’d suggest a nightly build: [https://two.avogadro.cc/](https://two.avogadro.cc/) ---
**Author:** ![ghutchis](https://discuss.avogadro.cc/user_avatar/discuss.avogadro.cc/ghutchis/32/456_2.png) [@ghutchis](https://discuss.avogadro.cc/u/ghutchis)\ **Post date:** [August 27, 2022, 3:24pm UTC](https://discuss.avogadro.cc/t/changing-bond-order-does-not-adjust-h-count-properly/3944/4 "2022-08-27T15:24:22Z")
> [@seal](#): > > For reference, the force field is set to “forcefields”. But this could be part of the update to force fields that you’ve mentioned elsewhere. No, that looks like there was a problem building Open Babel with that version. ---
**Author:** ![seal](https://discuss.avogadro.cc/user_avatar/discuss.avogadro.cc/seal/32/1234_2.png) [@seal](https://discuss.avogadro.cc/u/seal)\ **Post date:** [August 27, 2022, 3:43pm UTC](https://discuss.avogadro.cc/t/changing-bond-order-does-not-adjust-h-count-properly/3944/5 "2022-08-27T15:43:08Z")
> [@ghutchis](#): > > I don’t know which build you’re using I used this one from ~6 days ago > > > At the moment, it just applies SSAO and edge detection to spheres, cylinders and… opaque meshes, so as to test them. Some changes still pending: > \* Extend it to other geometry types. > \* Fix bugs, in particular SSAO working weird in perspective projection. > \* Add dialog to configure rendering. > > Developer Certificate of Origin > Version 1.1 > > Copyright (C) 2004, 2006 The Linux Foundation and its contributors. > 1 Letterman Drive > Suite D4700 > San Francisco, CA, 94129 > > Everyone is permitted to copy and distribute verbatim copies of this > license document, but changing it is not allowed. > > > Developer's Certificate of Origin 1.1 > > By making a contribution to this project, I certify that: > > (a) The contribution was created in whole or in part by me and I > have the right to submit it under the open source license > indicated in the file; or > > (b) The contribution is based upon previous work that, to the best > of my knowledge, is covered under an appropriate open source > license and I have the right under that license to submit that > work with modifications, whether created in whole or in part > by me, under the same open source license (unless I am > permitted to submit under a different license), as indicated > in the file; or > > (c) The contribution was provided directly to me by some other > person who certified (a), (b) or (c) and I have not modified > it. > > (d) I understand and agree that this project and the contribution > are public and that a record of the contribution (including all > personal information I submit with it, including my sign-off) is > maintained indefinitely and may be redistributed consistent with > this project or the open source license(s) involved. ---
**Author:** ![ghutchis](https://discuss.avogadro.cc/user_avatar/discuss.avogadro.cc/ghutchis/32/456_2.png) [@ghutchis](https://discuss.avogadro.cc/u/ghutchis)\ **Post date:** [August 27, 2022, 4:45pm UTC](https://discuss.avogadro.cc/t/changing-bond-order-does-not-adjust-h-count-properly/3944/6 "2022-08-27T16:45:54Z")
Right. I just don’t know if that has all the other fixes in it. The hydrogen bug was annoying - took ages to track down.