What’s the difference between SUMaterialGetUseOpacity and SUMaterialIsDrawnTransparent (introduced by SketchUp 2018) ?
https://extensions.sketchup.com/developer_center/sketchup_c_api/sketchup/material_8h.html
Dontcha just love these little terse API descriptions that just state the obvious or restate what the function name implies, … without really explaining anything in depth ?
Not. 
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