Particles
Transparent sprites
To see your alpha, the particles must be displayed as sprites. By default particles are displayed as points.
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Press D in the scene view to open the Display Options window.
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Click the Particles tab and set Display particles as Sprites.
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Close the window.
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Append a
Color POP to your particle system. -
On the Ramp sub-tab of the Color tab, set the Lookup parameter to
$LIFE.
Note
You will need to use a shader that will read the Alpha attribute in order to render. For example, VEX Layered Surface.