Question-and-Answer Resource for the Building Energy Modeling Community
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The OpenStudio surface matching method uses code from OpenStudio's API vs. SketchUp's so these settings won't directly affect them. As far as drawing clean geometry, I would focus on using SketchUp's inference engine, in particular make sure when you draw lines you are snapping "To End" , to "Edge" etc so that SketchUp will precisely align them. I have not had to alter the default units preferences, but I don't think it will hurt. One case that is notoriously for matching issues is importing geometry from another Cad tool into SketchUp. I don't know if the settings in this dialog affect geometry importing, but it may. Lastly keep in mind, use the OpenStudio measure for geometry intersection instead of using the intersect in the surface matching dialog in the SketchUp plugin.
Here is a link to the measure. You can run it in apply measures now in the OpenStudio application. https://bcl.nrel.gov/node/39833
