<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Chase,<div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>It’s principally because ChimeraX has to work with structures lacking explicit hydrogens, and so while it knows the valence of each atom. it doesn’t necessarily know the order of a particular bond due to tautomerism. Also, some bonds may have a non-integral order, e.g. aromatic ring bonds or carboxylates. It can also be tricky to orient the multiple lines, e.g. you may want to orient the double/triple bonds orthogonal to the view direction whereas you would want non-integral bonds to lie in the relevant plane, unless there isn’t one (e.g. phosphates)!</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Anyway, it’s kind of a headache, which is why we haven’t done anything about it so far. Certainly something could be done, at least for fully protonated structures, but ChimeraX lacks so many features that we do know how to implement and implement well that we haven’t been motivated to add ones where we’re not even sure what we would do…</div><div class=""><br class=""></div><div class="">—Eric</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span><br class=""><div class="">
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span class="Apple-tab-span" style="white-space: pre;"><br class="Apple-interchange-newline"> </span>Eric Pettersen</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>UCSF Computer Graphics Lab</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div><br class="Apple-interchange-newline">
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<div><br class=""><blockquote type="cite" class=""><div class="">On Nov 28, 2019, at 6:35 AM, Smith, Chase <<a href="mailto:chase.smith@mcphs.edu" class="">chase.smith@mcphs.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Dear ChimeraX,</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""> I was just wondering why there is no way to represent a double or triple bond in either the ligands or the protein amino acids when viewing as a Stick or Ball-and-Stick representation? I sometimes use Chimera or ChimeraX to make visuals for my lectures, and the students often have difficulty in understanding due to the absence of the multiple bonds. I would love to have the ability to represent the double or triple bonds with multiple lines between the atoms.</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class=""><br class=""></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Thank you, Chase Smith<br class=""></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""><table cellpadding="0" cellspacing="0" border="0" style="background-color: rgb(255, 255, 255); border-collapse: collapse; line-height: 16.66px; text-decoration: none;" class=""><tbody class=""><tr style="color: rgb(0, 0, 1); font-size: 13.33px; font-style: normal; font-weight: normal; white-space: nowrap;" class=""><td align="left" style="padding: 0px 0px 15px; vertical-align: top; text-align: left; font-family: Calibri, Arial, "Helvetica Neue", Helvetica, sans-serif;" class="">...<span style="font-family: remialcxesans; font-size: 1px; color: rgb(255, 255, 255); line-height: 1px;" class=""></span></td></tr><tr style="font-size: 0px;" class=""><td align="left" style="vertical-align: top;" class=""><table cellpadding="0" cellspacing="0" border="0" style="border-collapse: collapse; font-size: 0px; color: rgb(0, 0, 1); 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