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(Blender Tutorial) How to set Blender to Metric units
https://i.ytimg.com/vi/L9xnu0YgXag/hqdefault.jpg Tutorial on how to set Blender to the metric system cm/ meters instead of the standard blender units, this is the essential units of measurement for modelling to scale architecture and game assets for unity and unreal engine. Blender 2.78 source
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Blender – How to show transparent Alpha shadows – Blender render engine
https://i.ytimg.com/vi/iP5OvbJJiaM/hqdefault.jpg How to cast and see shadows from transparent alpha images/ photos, this tutorial will show you the correct settings to achieve correct shadows cast by Alpha images so that only the image’s shadow is shown. This is not for cycles only blender internal render engine. source