void setModelIndex(int atomIndex) {
if (currentMesh == null) return;
currentMesh.visible = true;
if (modelCount < 2) isFixed = true;
if ((currentMesh.atomIndex = atomIndex) >= 0)
currentMesh.modelIndex = (atomIndex < 0 ? -1 : viewer.getAtomModelIndex(atomIndex));
else if (isFixed) currentMesh.modelIndex = -1;
else currentMesh.modelIndex = viewer.getCurrentModelIndex();
if (currentMesh.thisID == null) currentMesh.thisID = myType + (++nUnnamed);
currentMesh.scriptCommand = script;
}
