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Opacity measures an object’s ability to pass light rays completely through the surface. You may also see this property referred to as transparency in other 3D programs, which is the opposite of transparency: in other words, an object that is 100% opaque is 0% transparent, and an object that it 0% opaque is 100% transparent. Sheet window glass is almost completely transparent, while wood is completely opaque.
The Opacity slider in the Basic and Advanced sub-tabs allows you to specify the opacity for your currently selected surface(s). You can set the amount of opacity through sliders, or you can use opacity maps to specify an exact amount of opacity at any given location in your object. You will typically find opacity maps used to feather the edges of modeled hair, or to make eyelashes appear as fine hairs rather than as a solid object. You can also use opacity maps to create sheer fabrics with intricate patterns.
The Basic sub-tab displays the following setting options for the Opacity channel.
The Advanced-sub-tab displays the following setting options for the Opacity Strength channel.