This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
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# Opacity

 Opacity[a]is a graphics directive which specifies that graphical objects which follow are to be displayed, if possible, with opacity a. Opacity[a, color] uses the specified color with opacity a.
• Opacity runs from 0 to 1, with 0 representing perfect transparency.
• If an opacity a object with color c1 is placed in front of an object with color c2, the resulting color will be the blend ac1+(1-a)c2.
• If red and blue with opacity 0.5 are combined, the result is purple—not black, as it would be with physical monochromatic filters.  »
• Opacity works in both 2D and 3D graphics.
• It may take significantly longer to render 3D graphics that involve transparent surfaces.
• Graphics that involve transparency may need to be printed as high-resolution bitmaps.
• On many computer systems, objects with opacity a will appear completely transparent if a is too small.  »
Make a 50% transparent sphere:
 Out[1]=

Plot a see-through surface:
 Out[1]=

Overlapping translucent 2D disks:
 Out[1]=
 Scope   (2)
 Applications   (3)
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