Avoid negative array size when drawing bounding boxes #38
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Closes #35
This small fix prevents
NegativeArraySizeExceptionwhen drawing the bounding box of certain meshes. E.g. see the corresponding issue (#35) for an example of a planar mesh. This fix comes from a section of the other open pull request on this repo: #22@ctrueden - do let me know if any changes are needed to this PR - happy to update as needed! I've tried to make the fix as minimal as possible, as I know the 3D viewer is old code + isn't updated often. No problem if it can't be merged though - thanks.